{"id":6460,"date":"2022-10-10T17:28:52","date_gmt":"2022-10-10T09:28:52","guid":{"rendered":"https:\/\/www.lilichao.com\/?p=6460"},"modified":"2022-10-11T11:00:33","modified_gmt":"2022-10-11T03:00:33","slug":"%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=6460","title":{"rendered":"\u5f02\u6b65\u7f16\u7a0b"},"content":{"rendered":"\n<p>\u5728\u8ba1\u7b97\u673a\u7684\u4e16\u754c\u4e2d\u7a0b\u5e8f\u6709\u540c\u6b65\u548c\u5f02\u6b65\u4e24\u79cd\u4e0d\u540c\u7684\u8fd0\u884c\u65b9\u5f0f\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\u5728\u5176\u4ed6\u7684\u8bed\u8a00\u4e2d\u6211\u4eec\u6240\u7f16\u5199\u7684\u4ee3\u7801\u90fd\u662f\u540c\u6b65\u8fd0\u884c\u7684\uff0c\u6240\u8c13\u7684\u540c\u6b65\u8fd0\u884c\u4e5f\u5c31\u662f\u4ee3\u7801\u4e00\u884c\u4e00\u884c\u6309\u987a\u5e8f\u6267\u884c\uff0c\u4e00\u884c\u6267\u884c\u5b8c\u624d\u4f1a\u6267\u884c\u4e0b\u4e00\u884c\u3002\u50cf\u4e0b\u8fb9\u8fd9\u6837\u4e00\u4e2a\u64cd\u4f5c\uff0c\u5c31\u662f\u975e\u5e38\u5178\u578b\u7684\u540c\u6b65\u4ee3\u7801\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b){\n    return a + b\n}\n\nconsole.log(&quot;\u7b2c\u4e00\u884c\u6253\u5370&quot;)\nlet result = sum(123, 456)\nconsole.log(result)\nconsole.log(&quot;\u7b2c\u4e8c\u884c\u6253\u5370&quot;)<\/code><\/pre><\/div>\n\n\n\n<p>\u540c\u6b65\u4ee3\u7801\u7684\u903b\u8f91\u6e05\u6670\u3001\u7ed3\u6784\u7b80\u5355\u3001\u5bb9\u6613\u7406\u89e3\u3002\u540c\u6b65\u5c31\u597d\u50cf\u6211\u4eec\u5728\u6309\u7167\u987a\u5e8f\u505a\u4e8b\u60c5\uff1a\u5148\u5237\u7259\uff0c\u518d\u6d17\u8138\uff0c\u7136\u540e\u6d17\u5934\u53d1\uff0c\u63a5\u7740\u62b9\u64e6\u8138\u6cb9\uff0c\u6700\u540e\u5439\u5934\u53d1\u3002\u603b\u4e4b\u4e00\u4ef6\u4e8b\u5e72\u5b8c\u624d\u53bb\u5e72\u4e0b\u4e00\u4ef6\u4e8b\u3002\u540c\u6b65\u770b\u4e0a\u53bb\u5341\u5206\u5408\u7406\uff0c\u4f46\u662f\u771f\u6b63\u64cd\u4f5c\u8d77\u6765\u5374\u4e0d\u603b\u662f\u90a3\u4e48\u7684\u5c3d\u5982\u4eba\u610f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u963b\u585e<\/h2>\n\n\n\n<p>\u540c\u6b65\u7684\u6700\u5927\u95ee\u9898\u662f\u963b\u585e\uff0c\u6240\u8c13\u963b\u585e\u5c31\u662f\u4e00\u6bb5\u4ee3\u7801\u4e0d\u6267\u884c\u5b8c\u6bd5\u5176\u540e\u7684\u6240\u6709\u4ee3\u7801\u4e5f\u4e0d\u4f1a\u6267\u884c\u3002\u6bd4\u5982\u4e0a\u8ff0\u7684\u6848\u4f8b\u4e2d\uff0c\u5982\u679csum()\u51fd\u6570\u6267\u884c\u901f\u5ea6\u6bd4\u8f83\u6162\uff0c\u7531\u4e8e\u6211\u4eec\u7f16\u5199\u7684\u662f\u540c\u6b65\u4ee3\u7801\uff0c\u6240\u4ee5\u5728sum()\u6267\u884c\u5b8c\u4e4b\u524d\u5176\u540e\u6240\u6709\u4ee3\u7801\u90fd\u4e0d\u4f1a\u6267\u884c\uff0c\u4e5f\u5c31\u662f\u5b83\u4f1a\u963b\u585e\u540e\u8fb9\u4ee3\u7801\u7684\u6267\u884c\u3002\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b){\n    let begin = Date.now()\n    while(Date.now() - begin &lt; 10000){\n\n    }\n    return a + b\n}\n\nconsole.log(&quot;\u7b2c\u4e00\u884c\u6253\u5370&quot;)\nlet result = sum(123, 456)\nconsole.log(result)\nconsole.log(&quot;\u7b2c\u4e8c\u884c\u6253\u5370&quot;)<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u4f8b\u4e2dsum()\u6267\u884c\u65f6\u4f1a\u505c\u987f10\u79d2\uff0c10\u79d2\u4ee5\u540e\u624d\u4f1a\u8fd4\u56de\u7ed3\u679c\uff0c\u7531\u4e8e\u662f\u540c\u6b65\u6267\u884c\u7684\u4ee3\u7801\uff0c\u6240\u4ee5sum()\u4f1a\u963b\u585e\u5176\u540e\u6240\u6709\u4ee3\u7801\u7684\u6267\u884c\uff0c\u5bfc\u81f4\u6574\u4e2a\u7a0b\u5e8f\u7684\u6267\u884c\u901f\u5ea6\u6781\u5dee\u3002<\/p>\n\n\n\n<p>\u60f3\u8c61\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff1a\u5982\u679c\u4eba\u662f\u540c\u6b65\u8fd0\u884c\u7684\u4f1a\u600e\u4e48\u6837\u5462\uff1f\u5047\u5982\u4e00\u4e2a\u4eba\u5fc5\u987b\u8981\u505a\u5b8c\u4e00\u4ef6\u4e8b\u624d\u80fd\u505a\u4e0b\u4e00\u4ef6\u4e8b\u60c5\uff0c\u4f1a\u662f\u4ec0\u4e48\u6837\u5b50\u7684\uff1f<\/p>\n\n\n\n<p>\u6628\u5929\u6211\u4e70\u4e86\u4e00\u7ba1\u7259\u818f\uff0c\u5feb\u9012\u8fd8\u6ca1\u5230\uff0c\u53ef\u662f\u6211\u65e9\u4e0a\u8d77\u6765\u7684\u7b2c\u4e00\u4ef6\u4e8b\u5c31\u662f\u5237\u7259\uff0c\u7136\u540e\u6d17\u8138\u7b49\u4e00\u7cfb\u5217\u7684\u4e8b\u60c5\u4f9d\u6b21\u8fdb\u884c\u3002\u7531\u4e8e\u6211\u662f\u540c\u6b65\u8fd0\u884c\u7684\uff0c\u5982\u679c\u4e0d\u5237\u7259\u5176\u4ed6\u7684\u4e8b\u60c5\u90fd\u65e0\u6cd5\u8fdb\u884c\uff0c\u4e8e\u662f\u51fa\u73b0\u4e86\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff0c\u4e00\u5927\u6e05\u65e9\uff0c\u6211\u7ad9\u5728\u955c\u5b50\u524d\u624b\u91cc\u4e3e\u7740\u7259\u5237\u53d1\u5446\uff0c\u6211\u5728\u5e72\u561b\uff1f\u7b49\u7740\u7259\u818f\u6765\u4e86\uff0c\u6211\u597d\u53bb\u5237\u7259\u2026\u2026\u6ca1\u6709\u7259\u818f\u8fd9\u4ef6\u4e8b\u5bfc\u81f4\u6211\u65e0\u6cd5\u5237\u7259\uff0c\u800c\u5237\u7259\u4e0d\u80fd\u5b8c\u6210\u540e\u7eed\u5de5\u4f5c\u6211\u4e5f\u65e0\u6cd5\u7ee7\u7eed\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u5237\u7259\u963b\u585e\u4e86\u6211\u7684\u5176\u4ed6\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f02\u6b65<\/h2>\n\n\n\n<p>\u73b0\u5b9e\u751f\u6d3b\u4e2d\u6211\u4eec\u90fd\u662f\u5f02\u6b65\u7684\uff0c\u6ca1\u6709\u7259\u818f\u4e0d\u80fd\u5237\u7259\u65f6\uff0c\u6211\u4eec\u4f1a\u5148\u53bb\u505a\u5176\u4ed6\u7684\u4e8b\u60c5\uff0c\u6d17\u8138\u3001\u6d17\u5934\u53d1\u7b49\u7b49\uff0c\u7b49\u5230\u7259\u818f\u9001\u5230\u4e86\u6211\u4eec\u4f1a\u56de\u8fc7\u5934\u518d\u53bb\u5b8c\u6210\u5237\u7259\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u6362\u53e5\u8bdd\u8bf4\u5982\u679c\u4e24\u4ef6\u4e8b\u4e4b\u95f4\u6ca1\u6709\u5fc5\u7136\u7684\u5148\u540e\u8054\u7cfb\uff0c\u4e00\u4ef6\u4e8b\u4e0d\u5e94\u8be5\u963b\u585e\u5230\u53e6\u4e00\u4ef6\u4e8b\u60c5\u7684\u8fd0\u884c\uff0c\u8fd9\u6837\u624d\u8db3\u591f\u7684\u6548\u7387\u3002<\/p>\n\n\n\n<p>\u5728\u7a0b\u5e8f\u4e2d\u4e5f\u662f\u5982\u6b64\uff0c\u7a0b\u5e8f\u4e2d\u6709\u4e9b\u4ee3\u7801\u7684\u6267\u884c\u901f\u5ea6\u5f88\u5feb\uff0c\u6bd4\u5982\uff1a\u6253\u5370\u4e00\u4e2a\u5185\u5bb9\u3001\u63a5\u6536\u4e00\u4e2a\u8bf7\u6c42\u3001\u53d1\u9001\u4e00\u4e2a\u54cd\u5e94\u7b49\u8fd9\u4e9b\u90fd\u662f\u7b80\u5355\u4e14\u5feb\u901f\u7684\u64cd\u4f5c\uff0c\u4f46\u6709\u4e9b\u64cd\u4f5c\u5374\u5f88\u6162\uff0c\u6bd4\u5982\uff1a\u8bfb\u5199\u786c\u76d8\u4e2d\u7684\u6587\u4ef6\uff08I\/O\u64cd\u4f5c\uff09\u3002\u663e\u7136\u6211\u4eec\u662f\u4e0d\u5e0c\u671b\u90a3\u4e9b\u8fd0\u884c\u5f88\u6162\u7684\u64cd\u4f5c\u963b\u585e\u5230\u90a3\u4e9b\u8fd0\u884c\u5feb\u7684\u64cd\u4f5c\u7684\u3002\u90a3\u8981\u5982\u4f55\u5904\u7406\u5462\uff1f<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u5176\u4ed6\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u5982java\uff0c\u5b83\u7684\u5904\u7406\u65b9\u5f0f\u7b80\u5355\u4e14\u7c97\u66b4\uff0c\u5373\u591a\u7ebf\u7a0b\u3002\u7ebf\u7a0b\u662f\u8ba1\u7b97\u673a\u4e2d\u8fd0\u7b97\u7684\u6267\u884c\u8005\uff0c\u6211\u4eec\u4ee3\u7801\u9700\u8981\u7ebf\u7a0b\u6765\u6267\u884c\uff0c\u5b83\u662f\u4e00\u4e2a\u5e72\u6d3b\u7684\u4eba\u3002\u5728java\u4e2d\uff0c\u5982\u679c\u9047\u5230\u963b\u585e\u7684\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u591a\u5f00\u51e0\u4e2a\u7ebf\u7a0b\u3002\u4f60\u4e0d\u662f\u4e0d\u5e0c\u671b\u8bfb\u53d6\u6587\u4ef6\u5f71\u54cd\u5230\u5176\u4ed6\u64cd\u4f5c\u5417\uff1fok\uff0c\u6211\u5f00\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u53d6\u6587\u4ef6\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u505a\u5176\u4ed6\u64cd\u4f5c\uff0c\u8fd9\u6837\u505a\u662f\u5b8c\u5168\u53ef\u884c\u7684\uff0c\u4e14\u663e\u5f97\u975e\u5e38\u9ad8\u7ea7\u3002\u5c31\u597d\u50cf\u6211\u4eec\u6ca1\u6709\u7259\u818f\u5237\u7259\u4e86\uff0c\u6211\u4eec\u600e\u4e48\u529e\u5462\uff1f\u5494\u5494\u5494\uff01\u5f71\u5206\u8eab\u4e4b\u672f\uff0c\u4e00\u4e2a\u5206\u8eab\u7b49\u7259\u818f\uff0c\u4e00\u4e2a\u5206\u8eab\u53bb\u6d17\u8138\u6d17\u5934\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u5bf9\u4e8eNode.js\u6765\u8bf4\uff0c\u5b83\u672c\u8eab\u5c31\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u6ca1\u6709\u521b\u5efa\u591a\u4e2a\u7ebf\u7a0b\u7684\u80fd\u529b\uff08\u5c31\u50cf\u4eba\u4e0d\u80fd\u5f71\u5206\u8eab\u4e00\u6837\uff09\u3002\u90a3\u5b83\u8981\u600e\u4e48\u529e\u5462\uff1f\u7b54\u6848\u5c31\u662f \u2014\u2014 \u5f02\u6b65\uff01\u5728node\u4e2d\uff0c\u5f53\u6211\u4eec\u9047\u5230\u8fd9\u79cd\u6bd4\u8f83\u6162\u7684\u64cd\u4f5c\u65f6\uff0c\u90fd\u4f1a\u91c7\u7528\u5f02\u6b65\u7684\u64cd\u4f5c\u3002\u6bd4\u5982\uff0c\u5f53\u6211\u4eec\u5e0c\u671b\u53bb\u8bfb\u53d6\u4e00\u4e2a\u8f83\u5927\u7684\u6587\u4ef6\u65f6\uff0cnode\u53ef\u4ee5\u5148\u5c06\u6307\u4ee4\u53d1\u9001\u7ed9\u8ba1\u7b97\u673a\uff0c\u7136\u540e\u7531\u8ba1\u7b97\u673a\u53bb\u8bfb\u53d6\u6587\u4ef6\uff0c\u6b64\u65f6node\u7684\u7ebf\u7a0b\u4e0d\u662f\u7b49\u5f85\u8ba1\u7b97\u673a\u6570\u636e\u8fd4\u56de\uff0c\u800c\u662f\u7ee7\u7eed\u5411\u4e0b\u6267\u884c\u5176\u4ed6\u7684\u64cd\u4f5c\uff0c\u4f55\u65f6\u53bb\u83b7\u53d6\u8ba1\u7b97\u673a\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5462\uff1f\u4e0d\u6025\uff0c\u7b49\u6570\u636e\u8fd4\u56de\u4e86\u6211\u4eec\u518d\u53bb\u8bfb\u53d6\uff0c\u8fd9\u6837\u65e2\u4e0d\u5f71\u54cd\u5176\u4ed6\u64cd\u4f5c\u4e5f\u53ef\u4ee5\u6b63\u5e38\u7684\u8bfb\u53d6\u5230\u8ba1\u7b97\u673a\u8fd4\u56de\u7684\u6570\u636e\uff01\u4e0a\u8fb9\u7684\u4ee3\u7801\u6211\u4eec\u4fbf\u53ef\u4ee5\u8fd9\u6837\u4fee\u6539\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b){\n    setTimeout(()=&gt;{\n        return a + b\n    }, 10000)\n}\n\nconsole.log(&quot;\u7b2c\u4e00\u884c\u6253\u5370&quot;)\nlet result = sum(123, 456)\nconsole.log(result)\nconsole.log(&quot;\u7b2c\u4e8c\u884c\u6253\u5370&quot;)<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8ff0\u4ee3\u7801\uff0c\u6211\u4eec\u5c06\u8ba1\u7b97\u64cd\u4f5c\u653e\u5165\u5230\u4e86setTimeout\u4e2d\uff0c\u540c\u6837\u662f\u7b49\u5f8510s\uff0c\u4f46\u662fsetTimeout\u4e0d\u4f1a\u963b\u585e\u5176\u4ed6\u4ee3\u7801\u7684\u6267\u884c\uff0c\u800c\u662f\u572810\u79d2\u540e\u5c06\u51fd\u6570\u653e\u5165\u5230\u4efb\u52a1\u961f\u5217\u4e2d\uff0c\u8fd9\u6837\u4e00\u6765\u5c31\u53ef\u4ee5\u5f88\u597d\u7684\u89e3\u51b3\u6389\u963b\u585e\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u4f46\u4e0e\u6b64\u540c\u65f6\u4e5f\u4ea7\u751f\u4e86\u4e00\u4e2a\u95ee\u9898\uff0c\u51fd\u6570\u786e\u5b9e\u4e0d\u4f1a\u963b\u585e\u540e\u7eed\u4ee3\u7801\u7684\u6267\u884c\u4e86\uff0c\u4f46\u662f\u7531\u4e8e\u51fd\u6570\u7684\u8fd4\u56de\u503c\u8bbe\u7f6e\u5230\u4e86setTimeout\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u8c03\u7528sum\u65f6\u4fbf\u65e0\u6cd5\u83b7\u53d6\u5230\u51fd\u6570\u7684\u8ba1\u7b97\u7ed3\u679c\u4e86\uff0c\u6b64\u65f6\u6211\u4eec\u5f97\u5230\u7684\u7ed3\u679c\u662fundefined\u3002\u8fd9\u4e5f\u662f\u5f02\u6b65\u7684\u4e00\u4e2a\u7279\u70b9\uff0c\u5f02\u6b65\u4ee3\u7801\u7684\u6267\u884c\u7ed3\u679c\u65e0\u6cd5\u901a\u8fc7\u8fd4\u56de\u503c\u83b7\u5f97\uff0c\u8fd4\u56de\u503c\u53ea\u80fd\u7528\u6765\u83b7\u53d6\u540c\u6b65\u4ee3\u7801\u7684\u6267\u884c\u7ed3\u679c\u3002\u90a3\u4e48\u5982\u4f55\u83b7\u53d6\u5f02\u6b65\u4ee3\u7801\u7684\u6267\u884c\u7ed3\u679c\u5462\uff1f\u7b54\u6848\u53ea\u6709\u4e00\u4e2a\u2014\u2014\u56de\u8c03\u51fd\u6570\uff0c\u5f02\u6b65\u4ee3\u7801\u901a\u5e38\u90fd\u9700\u8981\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u5f53\u5f02\u6b65\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\u53d6\u5f97\u7ed3\u679c\u65f6\u4fbf\u53ef\u4ee5\u5c06\u7ed3\u679c\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u7684\u53c2\u6570\u8fdb\u884c\u4f20\u9012\uff0c\u8fd9\u6837\u6211\u4eec\u4fbf\u53ef\u4ee5\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u6765\u8bfb\u53d6\u7ed3\u679c\uff0c\u5e76\u5b8c\u6210\u540e\u7eed\u64cd\u4f5c\u4e86\uff0c\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b, cb){\n    setTimeout(()=&gt;{\n        cb(a + b)\n    }, 10000)\n}\n\nconsole.log(&quot;\u7b2c\u4e00\u884c\u6253\u5370&quot;)\nsum(123, 456, result =&gt; {\n    console.log(result)\n})\nconsole.log(&quot;\u7b2c\u4e8c\u884c\u6253\u5370&quot;)<\/code><\/pre><\/div>\n\n\n\n<p>\u901a\u8fc7\u8fd9\u6837\u4e00\u4e2a\u4ecb\u7ecd\uff0c\u76f8\u4fe1\u4f60\u5bf9\u5f02\u6b65\u591a\u5c11\u80fd\u591f\u4e86\u89e3\u4e86\u4e00\u4e9b\u3002\u5728java\u8fd9\u79cd\u591a\u7ebf\u7a0b\u7684\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u901a\u5e38\u9700\u8981\u4e00\u4e2a\u53eb\u505a\u7ebf\u7a0b\u6c60\u7684\u4e1c\u897f\uff0c\u5728\u7a0b\u5e8f\u4e2d\u968f\u65f6\u8981\u6709\u4e00\u4e9b\u7ebf\u7a0b\u5728\u7ebf\u7a0b\u6c60\u4e2d\u5f85\u547d\uff0c\u5f53\u6709\u4efb\u52a1\u65f6\u9700\u8981\u8c03\u7528\u7ebf\u7a0b\u53bb\u6267\u884c\u7a0b\u5e8f\u4ee5\u5b8c\u6210\u529f\u80fd\uff0c\u5f53\u7ebf\u7a0b\u6c60\u4e2d\u7ebf\u7a0b\u4e0d\u591f\u4f7f\u7528\u65f6\u8fd8\u5fc5\u987b\u8981\u521b\u5efa\u65b0\u7684\u7ebf\u7a0b\u534f\u52a9\u5b8c\u6210\u4efb\u52a1\uff0c\u5f53\u7ebf\u7a0b\u6c60\u4e2d\u7684\u95f2\u7f6e\u7ebf\u7a0b\u8fc7\u591a\u65f6\u4e5f\u5fc5\u987b\u8981\u6e05\u7406\u6389\u4e00\u4e9b\u591a\u4f59\u7684\u7ebf\u7a0b\u3002\u65e0\u8bba\u662f\u7ebf\u7a0b\u6c60\u8fd8\u662f\u7ebf\u7a0b\u7684\u7ba1\u7406\u7a0b\u5e8f\u90fd\u9700\u8981\u8017\u8d39\u4e00\u5b9a\u7684\u7cfb\u7edf\u7684\u6027\u80fd\uff0c\u8fd9\u5c31\u8981\u6c42\u50cfjava\u8fd9\u79cd\u591a\u7ebf\u7a0b\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u5fc5\u987b\u8981\u8fd0\u884c\u5728\u4e00\u4e9b\u6027\u80fd\u8f83\u597d\u7684\u670d\u52a1\u5668\u4e2d\u3002<\/p>\n\n\n\n<p>\u800cNode.js\u8fd9\u79cd\u5f02\u6b65\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u7531\u4e8e\u59cb\u7ec8\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5728\u5e72\u6d3b\uff0c\u4e0d\u9700\u8981\u7ebf\u7a0b\u6c60\u5b58\u50a8\u7ebf\u7a0b\uff0c\u4e5f\u65e0\u9700\u7ebf\u7a0b\u7684\u7ba1\u7406\u8c03\u7528\u7a0b\u5e8f\u53bb\u7ba1\u7406\u7ebf\u7a0b\uff0c\u6240\u4ee5\u5b83\u5bf9\u670d\u52a1\u5668\u7684\u8981\u6c42\u5c31\u6bd4\u8f83\u4f4e\uff0c\u4ece\u800c\u4e5f\u5c31\u964d\u4f4e\u4e86\u670d\u52a1\u5668\u7684\u4f7f\u7528\u6210\u672c\u3002\u4f46\u662f\u5f02\u6b65\u7684\u7f16\u7a0b\u7684\u65b9\u5f0f\u4e5f\u63d0\u5347\u4e86\u7a0b\u5e8f\u7684\u590d\u6742\u5ea6\uff0c\u4f7f\u4ee3\u7801\u53d8\u5f97\u96be\u4ee5\u7406\u89e3\uff0c\u4e8e\u662f\u5982\u4f55\u7b80\u5316\u5f02\u6b65\u4ee3\u7801\uff0c\u8ba9\u5176\u66f4\u5bb9\u6613\u7f16\u5199\u4e8e\u7ef4\u62a4\u5c31\u662f\u6211\u4eec\u4e0b\u4e00\u6b65\u8981\u9762\u4e34\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u95ee\u9898<\/h2>\n\n\n\n<p>\u5f02\u6b65\u4ee3\u7801\u6700\u5927\u7684\u95ee\u9898\u5c31\u662f\u56de\u8c03\u51fd\u6570\u3002\u7531\u4e8e\u662f\u5f02\u6b65\u6267\u884c\uff0c\u5f02\u6b65\u51fd\u6570\u65e0\u6cd5\u76f4\u63a5\u901a\u8fc7\u8fd4\u56de\u503c\u6765\u8fd4\u56de\u6267\u884c\u7ed3\u679c\uff0c\u8981\u60f3\u53d6\u5f97\u7ed3\u679c\u5fc5\u987b\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u3002\u8fd9\u4e5f\u5c31\u5e26\u6765\u4e86\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e24\u4e2a\u5f02\u6b65\u64cd\u4f5c\u9700\u8981\u5148\u540e\u6267\u884c\uff0c\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u4f9d\u8d56\u4e8e\u4e0a\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u7684\u6267\u884c\u7ed3\u679c\u90a3\u8981\u600e\u4e48\u529e\u5462\uff1f\u7b80\u5355\uff0c\u53ea\u9700\u8981\u5728\u7b2c\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u8c03\u7528\u7b2c\u4e8c\u4e2a\u5f02\u6b65\u64cd\u4f5c\uff0c\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b, cb){\n    setTimeout(()=&gt;{\n        cb(a + b)\n    }, 10000)\n}\n\nsum(123, 456, result =&gt; {\n    sum(result, 777, result =&gt; {\n        console.log(result)\n    })\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u4f8b\u4e2d\uff0c\u8c03\u7528\u4e86\u4e24\u6b21sum\uff0c\u7b2c\u4e00\u6b21\u8c03\u7528\u8ba1\u7b97\u4e86123\u548c456\u7684\u548c\uff0c\u7b2c\u4e8c\u6b21\u8c03\u7528\u662f\u6c42\u7b2c\u4e00\u6b21\u7684\u8fd0\u7b97\u7ed3\u679c\u548c456\u7684\u548c\u3002\u7531\u4e8e\u5f02\u6b65\u51fd\u6570\u7684\u7ed3\u679c\u53ea\u80fd\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u8bbf\u95ee\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u80fd\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u7b2c\u4e8c\u6b21\u8c03\u7528sum\u3002\u5f53\u7136\uff0c\u5982\u679c\u4e8b\u60c5\u4ec5\u4ec5\u662f\u8fd9\u6837\u5176\u5b9e\u8fd8\u597d\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u5047\u8bbe\u6211\u9700\u8981\u8fde\u7eed\u8c03\u75284\u4e2a\u5f02\u6b65\u51fd\u6570\uff0c\u4e14\u540e\u4e00\u4e2a\u8981\u4f9d\u8d56\u4e8e\u524d\u4e00\u4e2a\u7684\u8fd0\u7b97\u7ed3\u679c\uff0c\u4e5f\u8bb8\u4f1a\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b, cb){\n    setTimeout(()=&gt;{\n        cb(a + b)\n    }, 10000)\n}\n\nsum(123, 456, result =&gt; {\n    sum(result, 777, result =&gt; {\n        sum(result, 888, result =&gt; {\n            sum(result, 999, result =&gt; {\n                console.log(result)\n            })\n        })\n    })\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u8fd9\u6837\u4e00\u6765\u6211\u4eec\u5c31\u89c1\u8bc6\u5230\u4e86\u4f20\u8bf4\u4e2d\u7684\u201c\u56de\u8c03\u5730\u72f1\u201d\uff0c\u53c8\u540d\u201c\u6b7b\u4ea1\u91d1\u5b57\u5854\u201d\u3002\u8fd9\u8fd8\u53ea\u662f4\u6b21\uff0c\u73b0\u5b9e\u7684\u4ee3\u7801\u53ef\u80fd\u6bd4\u8fd9\u4e2a\u8fd8\u8981\u518d\u590d\u6742\u4e00\u4e9b\u3002\u6bd4\u5982\uff0c\u67d0\u4e2a\u529f\u80fd\u9700\u8981\u7528\u5230\u4e09\u4e2a\u4e0d\u540c\u5f02\u6b65\u51fd\u6570\u8fd4\u56de\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u603b\u4e4b\uff0c\u5f02\u6b65\u63d0\u9ad8\u4e86\u4ee3\u7801\u8fd0\u884c\u7684\u6548\u7387\uff0c\u540c\u6837\u4e5f\u589e\u52a0\u4e86\u4ee3\u7801\u7684\u590d\u6742\u7a0b\u5ea6\u3002\u4e8e\u662f\uff0c\u6211\u4eec\u4fbf\u9700\u8981\u4e00\u4e2a\u65b0\u7684\u4e1c\u897f\u8ba9\u6211\u4eec\u53ef\u4ee5\u66f4\u52a0\u4f18\u96c5\u7684\u7f16\u5199\u5f02\u6b65\u7684\u4ee3\u7801\uff0cPromise\u5e94\u8fd0\u800c\u751f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Promise<\/h2>\n\n\n\n<p>\u53ea\u8981\u662f\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u6765\u83b7\u53d6\u5f02\u6b65\u7684\u7ed3\u679c\uff0c\u5c31\u4e00\u5b9a\u4f1a\u9047\u5230\u56de\u8c03\u5730\u72f1\u4e4b\u7c7b\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cJS\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e00\u4e2a\u5bf9\u8c61 \u2014\u2014 Promise\uff0cPromise\u610f\u4e3a\u627f\u8bfa\uff0c\u5b83\u53ef\u4ee5\u7528\u6765\u5b58\u50a8\u4e00\u4e2a\u503c\uff0c\u5e76\u786e\u4fdd\u5728\u4f60\u9700\u8981\u5c06\u8fd9\u4e2a\u503c\u8fd4\u56de\u3002\u8fd9\u4e00\u70b9\u542c\u4e0a\u53bb\u4f3c\u4e4e\u4e5f\u5e76\u6ca1\u6709\u4ec0\u4e48\u65b0\u5947\u7684\u5730\u65b9\uff0c\u4efb\u4f55\u4e00\u4e2a\u5bf9\u8c61\u90fd\u53ef\u4ee5\u5b58\u50a8\u503c\uff0c\u4e3a\u4ec0\u4e48\u975e\u5f97\u7528Promise\u5462\uff1f\u8bf4\u5230\u8fd9\u5c31\u5fc5\u987b\u5f97\u770b\u770bPromise\u7279\u522b\u7684\u5b58\u53d6\u6570\u636e\u7684\u65b9\u5f0f\u4e86\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u521b\u5efaPromise<\/h3>\n\n\n\n<p>Promise\u5b58\u50a8\u503c\u7684\u65b9\u5f0f\u975e\u5e38\u7684\u7279\u522b\uff0c\u6211\u4eec\u5148\u6765\u770b\u770b\u5b83\u7684\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise(executor)<\/code><\/pre><\/div>\n\n\n\n<p>\u521b\u5efaPromise\u65f6\u9700\u8981\u4e00\u4e2aexecutor\uff08\u6267\u884c\u5668\uff09\u4e3a\u53c2\u6570\uff0c\u6267\u884c\u5668\u662f\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u8fdb\u4e00\u6b65\u8c03\u7528\u5b83\u5927\u6982\u957f\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {})<\/code><\/pre><\/div>\n\n\n\n<p>\u56de\u8c03\u51fd\u6570\u5728\u6267\u884c\u65f6\u4f1a\u6536\u5230\u4e24\u4e2a\u53c2\u6570\uff0c\u4e24\u4e2a\u53c2\u6570\u90fd\u662f\u51fd\u6570\u3002\u7b2c\u4e00\u4e2a\u51fd\u6570\u901a\u5e38\u547d\u540d\u4e3aresolve\uff0c\u7b2c\u4e8c\u4e2a\u51fd\u6570\u901a\u5e38\u4f1a\u547d\u540d\u4e3areject\u3002\u5411Promise\u4e2d\u5b58\u50a8\u503c\u7684\u5173\u952e\u5c31\u5728\u4e8e\u8fd9\u4e24\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u5c06\u60f3\u8981\u5b58\u50a8\u5230Promise\u4e2d\u7684\u503c\u4f5c\u4e3a\u51fd\u6570\u7684\u53c2\u6570\u4f20\u9012\uff0c\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    resolve(&quot;\u54c8\u54c8&quot;)\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u8fd9\u6837\u6211\u4eec\u5c31\u5c06&#8221;\u54c8\u54c8&#8221;\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5b58\u50a8\u5230\u4e86Promise\u4e2d\uff0c\u90a3\u4e48\u95ee\u9898\u53c8\u6765\u4e86\uff0c\u4e3a\u4ec0\u4e48\u9700\u8981\u4e24\u4e2a\u51fd\u6570\u5b58\u50a8\u503c\u5462\uff1f\u5f88\u7b80\u5355\uff0cresolve\u7528\u6765\u5b58\u50a8\u8fd0\u884c\u6b63\u786e\u65f6\u7684\u6570\u636e\uff0creject\u7528\u6765\u5b58\u50a8\u8fd0\u884c\u51fa\u9519\u65f6\u7684\u9519\u8bef\u4fe1\u606f\u3002\u6211\u4eec\u5728\u4f7f\u7528Promise\u65f6\u9700\u8981\u6839\u636e\u4e0d\u540c\u7684\u60c5\u51b5\uff0c\u8c03\u7528\u4e0d\u540c\u7684\u51fd\u6570\u6765\u5b58\u50a8\u4e0d\u540c\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>Promise\u4e3a\u4ec0\u4e48\u6574\u4e86\u5982\u6b64\u590d\u6742\u7684\u4e00\u79cd\u65b9\u5f0f\u6765\u5b58\u50a8\u6570\u636e\u5462\uff1f\u5982\u679c\u4ec5\u4ec5\u662f\u5b58\u50a8\u5176\u4ed6\u7684\u6570\u636e\uff0c\u8fd9\u4e48\u505a\u786e\u5b9e\u6709\u70b9\u8131\u4e86\u653e\u3002\u4f46\u662fPromise\u662f\u4e13\u95e8\u4e3a\u4e86\u5f02\u6b65\u8c03\u7528\u800c\u751f\u7684\uff0c\u6240\u4ee5Promise\u4e2d\u5b58\u50a8\u7684\u4e3b\u8981\u662f\u5f02\u6b65\u8c03\u7528\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u90a3\u4e9b\u672c\u6765\u9700\u8981\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u6765\u4f20\u9012\u7684\u6570\u636e\u3002\u5728Promise\u4e2d\uff0c\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528\u5f02\u6b65\u4ee3\u7801\uff0c\u5728\u5f02\u6b65\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\u540e\u76f4\u63a5\u8c03\u7528resolve\u6216reject\u6765\u5c06\u6267\u884c\u7ed3\u679c\u5b58\u50a8\u5230Promise\u4e2d\uff0c\u8fd9\u5c31\u89e3\u51b3\u4e86\u5f02\u6b65\u4ee3\u7801\u65e0\u6cd5\u8bbe\u7f6e\u8fd4\u56de\u503c\u7684\u95ee\u9898\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5f02\u6b65\u4ee3\u7801\u7684\u6267\u884c\u7ed3\u679c\u53ef\u4ee5\u76f4\u63a5\u5b58\u50a8\u5230Promise\u4e2d\uff0c\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    setTimeout(() =&gt; {\n        resolve(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u4f8b\u4e2d\u901a\u8fc7setTimeout\u5b9e\u73b0\u4e86\u4e00\u4e2a\u5f02\u6b65\u8c03\u7528\uff0c\u5b9a\u65f6\u5668\u4f1a\u572810\u79d2\u540e\u6267\u884c\uff0c\u5e76\u8c03\u7528resolve\u5c06&#8221;\u54c8\u54c8&#8221;\u5b58\u50a8\u5230Promise\u4e2d\u3002\u73b0\u5728\u4f60\u5e94\u8be5\u80fd\u591f\u7406\u89e3\u4e3a\u4ec0\u4e48Promise\u6709\u8fd9\u4e48\u4e00\u4e2a\u5947\u602a\u7684\u5b58\u50a8\u503c\u7684\u65b9\u5f0f\u4e86\u5427\uff1f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u83b7\u53d6Promise\u4e2d\u7684\u6570\u636e<\/h3>\n\n\n\n<p>Promise\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u5947\u7279\uff0c\u8bfb\u53d6\u65b9\u5f0f\u540c\u6837\u7279\u6b8a\u3002\u6211\u4eec\u9700\u8981\u901a\u8fc7Promise\u7684\u5b9e\u4f8b\u65b9\u6cd5\u6765\u8bfb\u53d6\u5b58\u50a8\u5230Promise\u4e2d\u7684\u6570\u636e\u3002\u73b0\u5728\u6211\u4eec\u6709\u8fd9\u6837\u4e00\u4e2aPromise\uff0cPromise\u4e2d\u901a\u8fc7resolve\u5b58\u50a8\u4e86\u4e00\u4e2a\u6570\u636e&#8221;\u54c8\u54c8&#8221;\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject)=&gt;{\n    setTimeout(() =&gt; {\n        resolve(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">then<\/h4>\n\n\n\n<p>then\u662fPromise\u7684\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u901a\u8fc7\u8be5\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5230Promise\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u3002\u5b83\u9700\u8981\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0cPromise\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u4f1a\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u7684\u5b9e\u53c2\u8fd4\u56de\u7ed9\u6211\u4eec\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    setTimeout(() =&gt; {\n        resolve(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})\n\npromise.then((data) =&gt; {\n    console.log(data) \/\/ &quot;\u54c8\u54c8&quot;\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u6ce8\u610f\uff1a\u8fd9\u79cd\u65b9\u5f0f\u53ea\u9002\u5408\u8bfb\u53d6\u901a\u8fc7resolve\u5b58\u50a8\u7684\u6570\u636e\uff0c\u5982\u679c\u5b58\u50a8\u6570\u636e\u65f6\u51fa\u73b0\u4e86\u9519\u8bef\uff0c\u6216\u8005\u662f\u901a\u8fc7reject\u5b58\u50a8\u7684\u6570\u636e\uff0c\u8fd9\u79cd\u65b9\u5f0f\u662f\u8bfb\u53d6\u4e0d\u5230\u7684\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    throw new Error(&quot;\u51fa\u9519\u4e86\uff01&quot;)\n    setTimeout(() =&gt; {\n        resolve(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})\n\npromise.then((data) =&gt; {\n    console.log(data)\n})<\/code><\/pre><\/div>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    setTimeout(() =&gt; {\n        reject(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})\n\npromise.then((data) =&gt; {\n    console.log(data)\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8fb9\u7684\u4e24\u5757\u4ee3\u7801\u90fd\u662f\u8bfb\u53d6\u4e0d\u5230\u6570\u636e\u7684\uff0c\u800c\u4e14\u8fd0\u884c\u65f6\u4f1a\u5728\u63a7\u5236\u53f0\u62a5\u51fa\u9519\u8bef\u4fe1\u606f\u3002\u8fd9\u662f\u56e0\u4e3a\uff0cthen\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u53ea\u8d1f\u8d23\u8bfb\u53d6Promise\u4e2d\u4ee3\u7801\u6b63\u5e38\u6267\u884c\u7684\u7ed3\u679c\uff0c\u4e5f\u5c31\u662f\u53ea\u6709Promise\u4e2d\u6570\u636e\u6b63\u5e38\u65f6\u624d\u4f1a\u88ab\u8c03\u7528\u3002\u5f53Promise\u4e2d\u7684\u4ee3\u7801\u51fa\u9519\uff0c\u6216\u901a\u8fc7reject\u6765\u6dfb\u52a0\u6570\u636e\u65f6\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u4e3a\u5176\u6307\u5b9a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6765\u5904\u7406\u9519\u8bef\u3002<\/p>\n\n\n\n<p>then\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u540c\u6837\u662f\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u4e24\u4e2a\u56de\u8c03\u7684\u51fd\u6570\u7684\u7ed3\u6784\u76f8\u540c\uff0c\u4e0d\u540c\u70b9\u5728\u4e8e\u7b2c\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f1a\u5728\u6ca1\u6709\u5f02\u5e38\u65f6\u88ab\u8c03\u7528\u3002\u800c\u7b2c\u4e8c\u4e2a\u51fd\u6570\u4f1a\u5728\u51fa\u73b0\u9519\u8bef\uff08\u6216\u901a\u8fc7reject\u5b58\u50a8\u6570\u636e\uff09\u65f6\u8c03\u7528\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    throw new Error(&quot;\u4e3b\u52a8\u629b\u51fa\u9519\u8bef&quot;)\n    setTimeout(() =&gt; {\n        resolve(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})\n\npromise.then((data) =&gt; {\n    console.log(data)\n}, (err) =&gt; {\n    console.log(&quot;\u51fa\u9519\u4e86&quot;, err)\n})<\/code><\/pre><\/div>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    setTimeout(() =&gt; {\n        reject(&quot;\u54c8\u54c8&quot;)\n    }, 10000)\n})\n\npromise.then((data) =&gt; {\n    console.log(data)\n}, (err) =&gt; {\n    console.log(&quot;\u51fa\u9519\u4e86&quot;, err)\n})\n<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8fb9\u4e24\u4e2a\u6848\u4f8b\u4e2d\uff0cthen\u7684\u7b2c\u4e8c\u4e2a\u56de\u8c03\u51fd\u6570\u4f1a\u6267\u884c\u3002\u6267\u884c\u65f6\u5f02\u5e38\u4fe1\u606f\u6216\u65f6reject\u4e2d\u8fd4\u56de\u7684\u6570\u636e\u4f1a\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3002\u73b0\u5b9e\u5f00\u53d1\u4e2d\uff0c\u7b2c\u4e8c\u4e2a\u56de\u8c03\u51fd\u6570\u901a\u5e38\u4f1a\u7528\u6765\u7f16\u5199\u5f02\u5e38\u5904\u7406\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u539f\u7406<\/h4>\n\n\n\n<p>\u5728Promise\u4e2d\u7ef4\u62a4\u7740\u4e24\u4e2a\u9690\u85cf\u7684\u503cPromiseResult\u548cPromiseState\uff0cPromiseResult\u662fPromise\u4e2d\u771f\u6b63\u5b58\u50a8\u503c\u7684\u5730\u65b9\uff0c\u5728Promise\u4e2d\u65e0\u8bba\u662f\u901a\u8fc7resolve\u3001reject\u8fd8\u662f\u62a5\u9519\u65f6\u7684\u5f02\u5e38\u4fe1\u606f\u90fd\u4f1a\u5b58\u50a8\u5230PromiseResult\u4e2d\u3002PromiseState\u7528\u6765\u8868\u793aPromise\u4e2d\u503c\u7684\u72b6\u6001\uff0cPromise\u4e00\u5171\u6709\u4e09\u79cd\u72b6\u6001\uff1apending\u3001fulfilled\u3001rejected\u3002pending\u662fPromise\u7684\u521d\u59cb\u5316\u72b6\u6001\uff0c\u6b64\u65f6Promise\u4e2d\u6ca1\u6709\u4efb\u4f55\u503c\u3002fulfilled\u662fPromise\u7684\u5b8c\u6210\u72b6\u6001\uff0c\u6b64\u65f6\u8868\u793a\u503c\u5df2\u7ecf\u6b63\u5e38\u5b58\u50a8\u5230\u4e86Promise\u4e2d\uff08\u901a\u8fc7resolve\uff09\u3002rejected\u8868\u793a\u62d2\u7edd\uff0c\u6b64\u65f6\u8868\u793a\u503c\u662f\u901a\u8fc7reject\u5b58\u50a8\u7684\u6216\u662f\u6267\u884c\u65f6\u51fa\u73b0\u4e86\u9519\u8bef\u3002<\/p>\n\n\n\n<p>\u5f53\u6211\u4eec\u8c03\u7528Promise\u7684then\u65b9\u6cd5\u65f6\uff0c\u76f8\u5f53\u4e8e\u4e3aPromise\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0cthen\u4e2d\u7684\u56de\u8c03\u51fd\u6570\u4e0d\u4f1a\u7acb\u5373\u6267\u884c\uff0c\u800c\u662f\u5728Promise\u7684PromiseState\u53d1\u751f\u53d8\u5316\u65f6\u624d\u4f1a\u6267\u884c\u3002\u5982\u679cPromiseState\u4ecepending\u53d8\u6210\u4e86fulfilled\u5219then\u7684\u7b2c\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u6267\u884c\uff0c\u4e14PromiseResult\u7684\u503c\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u56de\u8c03\u51fd\u6570\u3002\u5982\u679cPromiseState\u4ecepending\u53d8\u6210\u4e86rejected\u5219then\u7684\u7b2c\u4e8c\u4e2a\u56de\u8c03\u51fd\u6570\u6267\u884c\uff0c\u4e14PromiseResult\u7684\u503c\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u56de\u8c03\u51fd\u6570\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"574\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/10\/20221010132511667-1024x574.png\" alt=\"\" class=\"wp-image-6479\" srcset=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/10\/20221010132511667-1024x574.png 1024w, https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/10\/20221010132511667-300x168.png 300w, https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/10\/20221010132511667-768x431.png 768w, https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/10\/20221010132511667-1000x561.png 1000w, https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/10\/20221010132511667.png 1370w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>then\u6267\u884c\u540e\u6bcf\u6b21\u603b\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684Promise\uff0c\u5e76\u5c06then\u4e2d\u56de\u8c03\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5b58\u50a8\u5230\u8fd9\u4e2aPromise\u4e2d\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u8fd4\u56de\u503c\u5219\u65b0Promise\u4e2d\u4e0d\u4f1a\u5b58\u50a8\u4efb\u4f55\u503c\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject)=&gt;{\n    resolve(&quot;\u7b2c\u4e00\u6b65\u6267\u884c\u7ed3\u679c&quot;)\n})\n\nconst promise2 = promise.then(result =&gt; {\n    console.log(&quot;\u6536\u5230\u7ed3\u679c\uff1a&quot;, result)\n    return &quot;\u7b2c\u4e8c\u6b65\u6267\u884c\u7ed3\u679c&quot; \/\/ \u4f1a\u4f5c\u4e3a\u65b0\u7684\u7ed3\u679c\u5b58\u50a8\u5230\u65b0Promise\u4e2d\n})\n\nconst promise3 = promise2.then(result =&gt; {\n    console.log(&quot;\u6536\u5230\u7ed3\u679c\uff1a&quot;, result)\n    return &quot;\u7b2c\u4e09\u6b65\u6267\u884c\u7ed3\u679c&quot; \/\/ \u4f1a\u4f5c\u4e3a\u65b0\u7684\u7ed3\u679c\u5b58\u50a8\u5230\u65b0Promise\u4e2d\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u5728\u7b80\u5316\u4e00\u4e9b\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject)=&gt;{\n    resolve(&quot;\u7b2c\u4e00\u6b65\u6267\u884c\u7ed3\u679c&quot;)\n})\n\npromise.then(result =&gt; {\n    console.log(&quot;\u6536\u5230\u7ed3\u679c\uff1a&quot;, result)\n    return &quot;\u7b2c\u4e8c\u6b65\u6267\u884c\u7ed3\u679c&quot; \/\/ \u4f1a\u4f5c\u4e3a\u65b0\u7684\u7ed3\u679c\u5b58\u50a8\u5230\u65b0Promise\u4e2d\n}).then(result =&gt; {\n    console.log(&quot;\u6536\u5230\u7ed3\u679c\uff1a&quot;, result)\n    return &quot;\u7b2c\u4e09\u6b65\u6267\u884c\u7ed3\u679c&quot; \/\/ \u4f1a\u4f5c\u4e3a\u65b0\u7684\u7ed3\u679c\u5b58\u50a8\u5230\u65b0Promise\u4e2d\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u7b2c\u4e00\u4e2athen\u7528\u6765\u8bfb\u53d6\u4e0a\u8fb9\u6211\u4eec\u521b\u5efa\u7684Promise\u4e2d\u5b58\u50a8\u7684\u7ed3\u679c\uff0c\u7b2c\u4e8c\u4e2athen\u7528\u6765\u8bfb\u53d6\u7b2c\u4e00\u4e2athen\u6240\u8fd4\u56de\u7684\u7ed3\u679c\uff0c\u4f9d\u6b64\u7c7b\u63a8\u6211\u4eec\u5c31\u53ef\u4ee5\u6839\u636e\u9700\u8981\u4e00\u76f4then\u4e0b\u53bb\uff0c\u5982\u6b64\u4fbf\u89e3\u51b3\u4e86\u201c\u56de\u8c03\u5730\u72f1\u201d\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u6709\u4e86Promise\u540e\uff0c\u5728\u5f02\u6b65\u51fd\u6570\u4e2d\u6211\u4eec\u4fbf\u4e0d\u518d\u9700\u8981\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u6765\u8fd4\u56de\u7ed3\u679c\uff0c\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\u8fd4\u56de\u4e00\u4e2aPromise\uff0c\u5e76\u5c06\u5f02\u6b65\u6267\u884c\u7684\u7ed3\u679c\u5b58\u50a8\u5230Promise\u4e2d\uff0c\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b){\n    return new Promise((resolve, reject) =&gt; {\n        setTimeout(()=&gt;{\n            resolve(a + b)\n        }, 10000)\n    })\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u7531\u4e8esum\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2aPromise\uff0c\u6240\u4ee5\u6211\u4eec\u4e0d\u5728\u9700\u8981\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u6765\u8bfb\u53d6\u7ed3\u679c\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sum(123, 456).then(result =&gt; {\n    console.log(&quot;\u7ed3\u679c\u4e3a\uff1a&quot;, result) \/\/ \u7ed3\u679c\u4e3a\uff1a 579\n})<\/code><\/pre><\/div>\n\n\n\n<p>\u5982\u679c\u9700\u8981\u8fde\u7eed\u591a\u6b21\u8c03\u7528\uff0c\u4e5f\u4e0d\u4f1a\u5728\u6709\u201c\u56de\u8c03\u5730\u72f1\u7684\u95ee\u9898\u201d\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sum(123, 456)\n    .then(result =&gt; sum(result, 777))\n    .then(result =&gt; sum(result, 888))\n    .then(result =&gt; console.log(result))<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">catch<\/h4>\n\n\n\n<p>\u9664\u4e86then\u4ee5\u5916\uff0cPromise\u4e2d\u8fd8\u6709\u4e00\u4e2acatch\u65b9\u6cd5\uff0ccatch\u548cthen\u4f7f\u7528\u65b9\u5f0f\u7c7b\u4f3c\uff0c\u4f46\u662fcatch\u4e2d\u53ea\u9700\u8981\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u3002catch\u4e2d\u56de\u8c03\u51fd\u6570\u7684\u4f5c\u7528\u7b49\u540c\u4e8ethen\u4e2d\u7684\u7b2c\u4e8c\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u4f1a\u5728\u6267\u884c\u51fa\u9519\u65f6\u88ab\u8c03\u7528\u3002\u65e2\u7136\u6709\u4e86then\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u4e00\u4e2acatch\u5462\uff1f\u4e24\u4e2a\u56de\u8c03\u51fd\u6570\u90fd\u5199\u5230then\u4e2d\uff0c\u4f1a\u5bfc\u81f4\u4ee3\u7801\u4e0d\u591f\u6e05\u6670\uff0c\u4f46\u662f\u591a\u4e86\u4e00\u4e2acatch\u540e\u7acb\u523b\u5c31\u53d8\u7684\u4e0d\u4e00\u6837\u4e86\uff0c\u5f00\u53d1\u65f6\u901a\u5e38\u4f1a\u5728then\u4e2d\u7f16\u5199\u6b63\u5e38\u8fd0\u884c\u65f6\u7684\u4ee3\u7801\uff0ccatch\u4e2d\u7f16\u5199\u51fa\u73b0\u5f02\u5e38\u540e\u8981\u6267\u884c\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const promise = new Promise((resolve, reject) =&gt; {\n    reject(&quot;\u51fa\u9519\u4e86&quot;)\n})\n\n\n\/\/ \u51fa\u73b0\u5f02\u5e38\uff0cthen\u4e2d\u53ea\u4f20\u4e86\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u65e0\u6cd5\u8bfb\u53d6\u6570\u636e\n\/\/ promise.then((data) =&gt; {\n\/\/     console.log(data)\n\/\/ }) \n\n\/\/ \u51fa\u73b0\u5f02\u5e38\uff0c\u53ef\u4ee5\u901a\u8fc7catch\u6765\u8bfb\u53d6\u6570\u636e\npromise.catch(err =&gt; {\n    console.log(err)\n})\n<\/code><\/pre><\/div>\n\n\n\n<p>\u5f53Promise\u4e2d\u4ee3\u7801\u6267\u884c\u51fa\u9519\u65f6\uff08\u6216\u8005reject\u6267\u884c\u65f6\uff09\uff0c\u5982\u679c\u6211\u4eec\u8c03\u7528\u7684\u662fcatch\u6765\u5904\u7406\u6570\u636e\uff0c\u5219Promise\u4f1a\u5c06\u9519\u8bef\u4fe1\u606f\u4f20\u9012\u7ed9catch\u7684\u56de\u8c03\u51fd\u6570\uff0c\u6211\u4eec\u4fbf\u53ef\u4ee5\u5728catch\u4e2d\u5904\u7406\u5f02\u5e38\uff0c\u540c\u65f6catch\u56de\u8c03\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4f1a\u4f5c\u4e3a\u4e0b\u4e00\u6b65Promise\u4e2d\u7684\u6570\u636e\u5411\u4e0b\u4f20\u9012\u3002\u5982\u679c\u6211\u4eec\u8c03\u7528\u4e86then\u6765\u5904\u7406\u6570\u636e\uff0c\u540c\u65f6\u6ca1\u6709\u4f20\u9012\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u8fd9\u65f6then\u662f\u4e0d\u4f1a\u6267\u884c\u7684\uff0c\u800c\u662f\u5c06\u9519\u8bef\u4fe1\u606f\u76f4\u63a5\u6dfb\u52a0\u5230\u4e0b\u4e00\u6b65\u8fd4\u56de\u7684Promise\u4e2d\uff0c\u7531\u540e\u7eed\u7684\u65b9\u6cd5\u5904\u7406\u3002\u5728\u540e\u7eed\u8c03\u7528\u4e2d\u5982\u679c\u6709catch\u6216then\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u5219\u6b63\u5e38\u5904\u7406\u3002\u5982\u679c\u6ca1\u6709\uff0c\u5219\u62a5\u9519\u3002<\/p>\n\n\n\n<p>\u7b80\u8a00\u4e4b\uff0c\u5904\u7406Promise\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u5bf9Promise\u4e2d\u7684\u5f02\u5e38\u8fdb\u884c\u5904\u7406\uff08\u65e0\u8bba\u662fthen\u7684\u4e8c\u53c2\u6570\uff0c\u8fd8\u662fcatch\uff09\uff0c\u5219\u5f02\u5e38\u4fe1\u606f\u603b\u662f\u4f1a\u5c01\u88c5\u5230\u4e0b\u4e00\u6b65\u7684Promise\u4e2d\u8fdb\u884c\u4f20\u9012\uff0c\u76f4\u5230\u627e\u5230\u5f02\u5e38\u5904\u7406\u7684\u4ee3\u7801\u4f4d\u7f6e\uff0c\u5982\u679c\u4e00\u76f4\u6ca1\u6709\u5904\u7406\uff0c\u5219\u62a5\u9519\u3002<\/p>\n\n\n\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u65b9\u5f0f\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u5728\u4efb\u610f\u7684\u4f4d\u7f6e\u5bf9Promise\u7684\u5f02\u5e38\u8fdb\u884c\u5904\u7406\uff0c\u4f8b\u5982\u6709\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b) {\n    return new Promise((resolve, reject) =&gt; {\n        if (Math.random() &gt; 0.7) {\n            throw new Error(&quot;\u51fa\u9519\u4e86&quot;)\n        }\n        resolve(a + b)\n    })\n}\n\nsum(123, 456)\n    .then(result =&gt; sum(result, 777))\n    .then(result =&gt; sum(result, 888))\n    .then(result =&gt; console.log(result))<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u4f8b\u4ee3\u7801\u4e2d\uff0csum\u51fd\u6570\u6709\u4e00\u5b9a\u7684\u51e0\u7387\u4f1a\u51fa\u73b0\u5f02\u5e38\uff0c\u4f46\u662f\u6211\u4eec\u5e76\u4e0d\u786e\u5b9a\u4f55\u65f6\u4f1a\u51fa\u73b0\u5f02\u5e38\uff0c\u8fd9\u65f6\u6709\u4e86catch\u5c31\u53d8\u7684\u975e\u5e38\u7684\u65b9\u4fbf\uff0c\u56e0\u4e3a\u5728\u51fa\u73b0\u5f02\u5e38\u540e\u6240\u6709\u7684then\u5728\u5f02\u5e38\u5904\u7406\u524d\u90fd\u4e0d\u4f1a\u6267\u884c\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5c06catch\u5199\u5728\u8c03\u7528\u94fe\u7684\u6700\u540e\uff0c\u8fd9\u6837\u65e0\u8bba\u54ea\u4e00\u6b65\u51fa\u73b0\u5f02\u5e38\uff0c\u6211\u4eec\u90fd\u53ef\u4ee5\u5728\u6700\u540e\u7edf\u4e00\u5904\u7406\u3002\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sum(123, 456)\n    .then(result =&gt; sum(result, 777))\n    .then(result =&gt; sum(result, 888))\n    .then(result =&gt; console.log(result))\n    .catch(err =&gt; console.log(&quot;\u54ce\u5440\u51fa\u9519\u4e86\uff0c\u968f\u4fbf\u8fd4\u56de\u4e00\u4e2a\u5427&quot;, 8888))<\/code><\/pre><\/div>\n\n\n\n<p>\u5f53\u7136\u5982\u679c\u6211\u4eec\u60f3\u5728\u4e2d\u95f4\u5904\u7406\u5f02\u5e38\u4e5f\u662f\u6ca1\u6709\u95ee\u9898\u7684\uff0c\u53ea\u662f\u9700\u8981\u6ce8\u610f\u5728\u94fe\u5f0f\u8c03\u7528\u4e2d\u95f4\u5904\u7406\u5f02\u5e38\u65f6\uff0c\u7531\u4e8e\u540e\u7eed\u8fd8\u6709then\u8981\u6267\u884c\uff0c\u6240\u4ee5\u4e00\u5b9a\u4e0d\u8981\u5fd8\u4e86\u8003\u8651\u662f\u5426\u9700\u8981\u5728catch\u4e2d\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u4f9b\u540e\u7eed\u7684Promise\u4f7f\u7528\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sum(123, 456)\n    .then(result =&gt; sum(result, 777))\n    .catch(err =&gt; {\n        \/\/ \u4e5f\u53ef\u4ee5\u5728\u8c03\u7528\u94fe\u7684\u4e2d\u95f4\u5904\u7406\u5f02\u5e38\n        console.log(&quot;\u51fa\u9519\u4e86\uff0c\u6211\u9009\u62e9\u5ffd\u7565\u8fd9\u4e2a\u9519\u8bef\uff0c\u91cd\u65b0\u8ba1\u7b97&quot;)\n        return sum(123, 456)\n    })\n    .then(result =&gt; sum(result, 888))\n    .then(result =&gt; console.log(result))\n    .catch(err =&gt; console.log(&quot;\u54ce\u5440\u51fa\u9519\u4e86\uff0c\u968f\u4fbf\u8fd4\u56de\u4e00\u4e2a\u5427&quot;, 8888))<\/code><\/pre><\/div>\n\n\n\n<p>\u8fd8\u6709\u4e00\u70b9\u8981\u5f3a\u8c03\u4e00\u4e0b\uff0c\u5728Promise\u6b63\u5e38\u6267\u884c\u7684\u60c5\u51b5\u4e0b\u5982\u679c\u9047\u5230catch\uff0ccatch\u662f\u4e0d\u4f1a\u6267\u884c\u7684\uff0c\u6b64\u65f6Promise\u4e2d\u7684\u7ed3\u679c\u4f1a\u81ea\u52a8\u4f20\u9012\u7ed9\u4e0b\u4e00\u4e2aPromise\u4f9b\u540e\u7eed\u4f7f\u7528\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">finally<\/h4>\n\n\n\n<p>finally\u4e5f\u662fPromise\u7684\u5b9e\u4f8b\u65b9\u6cd5\u4e4b\u4e00\uff0c\u548cthen\u3001catch\u4e0d\u540c\uff0c\u65e0\u8bba\u4f55\u79cd\u60c5\u51b5finally\u4e2d\u7684\u56de\u8c03\u51fd\u6570\u603b\u4f1a\u6267\u884c\uff0c\u901a\u5e38\u6211\u4eec\u5728finally\u4e2d\u5b9a\u4e49\u4e00\u4e9b\u65e0\u8bbaPromise\u6b63\u786e\u6267\u884c\u4e0e\u5426\u90fd\u9700\u8981\u5904\u7406\u7684\u5de5\u4f5c\u3002\u6ce8\u610f\uff0cfinally\u7684\u56de\u8c03\u51fd\u6570\u4e0d\u4f1a\u63a5\u6536\u4efb\u4f55\u53c2\u6570\uff0c\u540c\u65f6finally\u7684\u8fd4\u56de\u503c\u4e5f\u4e0d\u4f1a\u6210\u4e3a\u4e0b\u4e00\u6b65\u7684Promise\u4e2d\u7684\u7ed3\u679c\u3002\u7b80\u5355\u8bf4\uff0cfinally\u53ea\u662f\u7f16\u5199\u4e00\u4e9b\u5fc5\u987b\u8981\u6267\u884c\u7684\u4ee3\u7801\uff0c\u4e0d\u4f1a\u5bf9Promise\u4ea7\u751f\u4efb\u4f55\u5b9e\u8d28\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u9759\u6001\u65b9\u6cd5<\/h2>\n\n\n\n<p>Promise\u7684\u9759\u6001\u65b9\u6cd5\u76f4\u63a5\u901a\u8fc7Promise\u7c7b\u53bb\u8c03\u7528\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5b8c\u6210\u4e00\u4e9b\u66f4\u52a0\u590d\u6742\u7684\u5f02\u6b65\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.all<\/h3>\n\n\n\n<p>\u5f53\u6211\u4eec\u6709\u591a\u4e2aPromise\u9700\u8981\u6267\u884c\uff0c\u4e14\u9700\u8981\u591a\u4e2aPromise\u90fd\u6267\u884c\u5b8c\u6bd5\uff0c\u5728\u5c06\u4ed6\u4eec\u7684\u7ed3\u679c\u8fdb\u884c\u7edf\u4e00\u5904\u7406\u65f6\uff0c\u6211\u4eec\u4fbf\u53ef\u4ee5\u4f7f\u7528Promise.all\u6765\u5e2e\u52a9\u6211\u4eec\u5b8c\u6210\u8fd9\u9879\u5de5\u4f5c\u3002<\/p>\n\n\n\n<p>Promise.all(iterable)<\/p>\n\n\n\n<p>all\u9700\u8981\u4e00\u4e2a\u6570\u7ec4\uff08\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff09\u4f5c\u4e3a\u53c2\u6570\uff0c\u6570\u7ec4\u4e2d\u53ef\u4ee5\u5b58\u653e\u591a\u4e2aPromise\u3002\u8c03\u7528\u540e\uff0call\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0Promise\uff0c\u8fd9\u4e2aPromise\u4f1a\u5728\u6570\u7ec4\u4e2d\u6240\u6709\u7684Promise\u90fd\u6267\u884c\u540e\u5b8c\u6210\uff0c\u5e76\u8fd4\u56de\u6240\u6709Promise\u7684\u7ed3\u679c\u3002\u6bd4\u5982\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sum(a, b) {\n    return new Promise((resolve, reject) =&gt; {\n        setTimeout(() =&gt; {\n            resolve(a + b)\n        }, 5000);\n    })\n}\n\nPromise.all([sum(1, 1), sum(2, 2), sum(3, 3)])\n    .then((result) =&gt; {\n        console.log(result)\n    })<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u4f8b\u4e2d\uff0c\u8c03\u7528\u4e09\u6b21sum\uff0c\u4e14\u5c06\u5176\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u4f20\u9012\u7ed9all\u3002\u8c03\u7528\u540eall\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684Promise\uff0c\u5f53\u4e09\u6b21\u8ba1\u7b97\u90fd\u5b8c\u6210\u540e\uff0c\u65b0\u7684Promise\u4e5f\u4f1a\u53d8\u4e3a\u5b8c\u6210\u72b6\u6001\uff0c\u5e76\u5c06\u4e09\u6b21\u6267\u884c\u7684\u7ed3\u679c\u5c01\u88c5\u5230\u6570\u7ec4\u4e2d\u8fd4\u56de\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.allSettled<\/h3>\n\n\n\n<p>all\u4ec5\u6709\u5f53\u5168\u90e8Promise\u90fd\u5b8c\u6210\u65f6\u624d\u4f1a\u8fd4\u56de\u6709\u6548\u6570\u636e\uff0c\u800callSettled\u7528\u6cd5\u548call\u4e00\u81f4\uff0c\u4f46\u662f\u5b83\u91cc\u8fb9\u65e0\u8bbaPromise\u662f\u5426\u5b8c\u6210\u90fd\u4f1a\u8fd4\u56de\u6570\u636e\uff0c\u53ea\u662f\u4ed6\u4f1a\u6839\u636e\u4e0d\u540c\u7684\u72b6\u6001\u8fd4\u56de\u4e0d\u540c\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u6210\u529f\uff1a{status:&#8221;fulfilled&#8221;, value:result}<\/p>\n\n\n\n<p>\u5931\u8d25\uff1a{status:&#8221;rejected&#8221;, reason:error}<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.race<\/h3>\n\n\n\n<p>race\u4f1a\u8fd4\u56de\u9996\u5148\u6267\u884c\u5b8c\u7684Promise\uff0c\u800c\u5ffd\u7565\u5176\u4ed6\u672a\u6267\u884c\u5b8c\u7684Promise<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.any<\/h3>\n\n\n\n<p>any\u4f1arace\u7c7b\u4f3c\uff0c\u4f46\u662f\u5b83\u53ea\u4f1a\u8fd4\u56de\u7b2c\u4e00\u4e2a\u6210\u529f\u7684Promise\uff0c\u5982\u679c\u6240\u6709\u7684Promise\u90fd\u5931\u8d25\u624d\u4f1a\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.resolve<\/h3>\n\n\n\n<p>Promise.resolve\u7528\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684Promise\u5b9e\u4f8b\uff0c\u4e14\u76f4\u63a5\u901a\u8fc7resolve\u5b58\u5165\u4e00\u4e2a\u6570\u636e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.reject<\/h3>\n\n\n\n<p>Promise.reject\u7528\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684Promise\u5b9e\u4f8b\uff0c\u4e14\u76f4\u63a5\u901a\u8fc7reject\u5b58\u5165\u4e00\u4e2a\u6570\u636e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u8ba1\u7b97\u673a\u7684\u4e16\u754c\u4e2d\u7a0b\u5e8f\u6709\u540c\u6b65\u548c\u5f02\u6b65\u4e24\u79cd\u4e0d\u540c\u7684\u8fd0\u884c\u65b9\u5f0f\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\u5728\u5176\u4ed6\u7684\u8bed\u8a00\u4e2d\u6211\u4eec\u6240\u7f16\u5199\u7684\u4ee3\u7801\u90fd\u662f\u540c\u6b65\u8fd0\u884c\u7684\uff0c\u6240 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[274],"tags":[],"_links":{"self":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6460"}],"collection":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6460"}],"version-history":[{"count":13,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6460\/revisions"}],"predecessor-version":[{"id":6485,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6460\/revisions\/6485"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/media\/6482"}],"wp:attachment":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}