{"id":6075,"date":"2020-05-01T19:25:49","date_gmt":"2020-05-01T11:25:49","guid":{"rendered":"https:\/\/www.lilichao.com\/?p=6075"},"modified":"2022-05-14T19:31:19","modified_gmt":"2022-05-14T11:31:19","slug":"%e8%bf%90%e7%ae%97%e7%ac%a6%ef%bc%882%ef%bc%89","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=6075","title":{"rendered":"\u8fd0\u7b97\u7b26\uff082\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4e00\u5143\u8fd0\u7b97\u7b26\uff08Unary operators\uff09<\/h2>\n\n\n\n<p>\u4e00\u5143\u8fd0\u7b97\u7b26\u6307\u53ea\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\u7684\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u7b26\u53f7<\/td><td>\u4f5c\u7528<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>+<\/td><td>\u6b63\u53f7\uff0c\u4e0d\u4f1a\u6539\u53d8\u6570\u5b57\u7684\u6b63\u526f<\/td><td>+10<\/td><\/tr><tr><td>&#8211;<\/td><td>\u8d1f\u53f7\uff0c\u4f1a\u5c06\u4e00\u4e2a\u6570\u5b57\u7b26\u53f7\u53d6\u53cd<\/td><td>-10<\/td><\/tr><tr><td>delete<\/td><td>\u5220\u9664\u53d8\u91cf\u6216\u5c5e\u6027<\/td><td>delete a \u6216 delete o.name<\/td><\/tr><tr><td>typeof<\/td><td>\u68c0\u67e5\u4e00\u4e2a\u503c\u7684\u7c7b\u578b<\/td><td>typeof 123<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u4e00\u5143\u7684+\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u6570\u5b66\u4e2d\u7684\u6b63\u53f7\u3002\u5bf9\u4e00\u4e2a\u6570\u5b57\u52a0\u4e2a\u6b63\u53f7\u4e0d\u4f1a\u5bf9\u6570\u5b57\u4ea7\u751f\u4efb\u4f55\u7684\u5f71\u54cd\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u975e\u6570\u5b57\u7684\u503c\u52a0\u6b63\u53f7\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u5b57\u3002<\/p>\n\n\n\n<p>\u4e00\u5143\u7684-\uff0c\u4e5f\u5c31\u662f\u6570\u5b66\u4e2d\u7684\u8d1f\u53f7\u3002\u5b83\u4f1a\u5bfc\u81f4\u4e00\u4e2a\u6570\u5b57\u7684\u7b26\u53f7\u4f4d\u53d6\u53cd\uff0c\u6b63\u53f7\u53d8\u8d1f\u53f7\uff0c\u8d1f\u53f7\u53d8\u6b63\u53f7\uff0c\u5176\u4ed6\u7279\u70b9\u548c\u4e00\u5143\u7684+\u662f\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n<p>delete\u7528\u6765\u5220\u9664\u4e00\u4e2a\u53d8\u91cf\u6216\u662f\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\uff0c\u5220\u9664\u4ee5\u540e\u53d8\u91cf\u548c\u5c5e\u6027\u5c06\u4f1a\u6d88\u5931\uff0c\u4f46\u662f\u6ce8\u610f\u5e38\u91cf\u662f\u5220\u4e0d\u4e86\u7684\u3002<\/p>\n\n\n\n<p>typeof\u7528\u6765\u68c0\u67e5\u4e00\u4e2a\u503c\u7684\u7c7b\u578b\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u63cf\u8ff0\u88ab\u68c0\u67e5\u503c\u7684\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u6765\u8bf4\u660e\u5176\u7c7b\u578b\u3002\u8fd4\u56de\u503c\u60c5\u51b5\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u7c7b\u578b<\/td><td>\u8fd4\u56de\u503c<\/td><\/tr><tr><td>\u672a\u5b9a\u4e49\uff08Undefined\uff09<\/td><td>&#8220;undefined&#8221;<\/td><\/tr><tr><td>\u7a7a\u503c\uff08Null\uff09<\/td><td>&#8220;object&#8221;<\/td><\/tr><tr><td>\u5e03\u5c14\u503c\uff08Boolean\uff09<\/td><td>&#8220;boolean&#8221;<\/td><\/tr><tr><td>\u6570\u503c\uff08Number\uff09<\/td><td>&#8220;number&#8221;<\/td><\/tr><tr><td>\u5927\u6574\u6570\uff08BigInt\uff09<\/td><td>&#8220;bigint&#8221;<\/td><\/tr><tr><td>\u5b57\u7b26\u4e32\uff08String\uff09<\/td><td>&#8220;string&#8221;<\/td><\/tr><tr><td>\u51fd\u6570\uff08Function\uff09<\/td><td>&#8220;function&#8221;<\/td><\/tr><tr><td>\u5176\u4ed6\u5bf9\u8c61\uff08Object\uff09<\/td><td>&#8220;object&#8221;<\/td><\/tr><tr><td>Symbol<\/td><td>&#8220;symbol&#8221;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u8d4b\u503c\u8fd0\u7b97\u7b26\uff08Assignment operators\uff09<\/h2>\n\n\n\n<p>\u6700\u5178\u578b\u7684\u8d4b\u503c\u8fd0\u7b97\u7b26\u5c31\u662f\u7b49\u53f7\uff0c\u901a\u8fc7\u8d4b\u503c\u8fd0\u7b97\u7b26\u53ef\u4ee5\u7528\u6765\u4fee\u6539\u53d8\u91cf\u7684\u503c\u3002\u9664\u4e86\u7b49\u53f7\u4ee5\u5916\u5728JS\u4e2d\u8fd8\u63d0\u4f9b\u4e86\u5f88\u591a\u5176\u4ed6\u7684\u8d4b\u503c\u8fd0\u7b97\u7b26\u53f7\uff0c\u8fd9\u91cc\u53ea\u662f\u7b80\u5355\u7f57\u5217\u4e00\u4e0b\u4e0d\u518d\u8be6\u7ec6\u8bf4\u660e\u3002\u53e6\u5916\u8fd9\u91cc\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u5c5e\u4e8e\u8be5\u53d8\u91cf\uff0c\u8c03\u7528\u540e\u53d8\u91cf\u7684\u503c\u5373\u53d1\u751f\u53d8\u5316\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u7b26\u53f7<\/td><td>\u4f5c\u7528<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>=<\/td><td>\u5c06\u53f3\u4fa7\u503c\u8d4b\u503c\u7ed9\u5de6\u4fa7\u53d8\u91cf<\/td><td>a = 10<\/td><\/tr><tr><td>+=<\/td><td>\u5bf9\u5de6\u4fa7\u53d8\u91cf\u589e\u52a0\u6307\u5b9a\u7684\u503c<\/td><td>a += 10 \u7b49\u4ef7\u4e8e a = a + 10<\/td><\/tr><tr><td>-=<\/td><td>\u5bf9\u5de6\u4fa7\u53d8\u91cf\u51cf\u5c11\u6307\u5b9a\u7684\u503c<\/td><td>a -= 10 \u7b49\u4ef7\u4e8e a = a &#8211; 10<\/td><\/tr><tr><td>*=<\/td><td>\u5bf9\u5de6\u4fa7\u53d8\u91cf\u4e58\u6307\u5b9a\u7684\u503c<\/td><td>a *= 10 \u7b49\u4ef7\u4e8e a = a * 10<\/td><\/tr><tr><td>\/=<\/td><td>\u5bf9\u5de6\u4fa7\u7684\u53d8\u91cf\u9664\u4ee5\u6307\u5b9a\u503c<\/td><td>a \/= 10 \u7b49\u4ef7\u4e8e a = a \/ 10<\/td><\/tr><tr><td>%=<\/td><td>\u5bf9\u5de6\u4fa7\u53d8\u91cf%\u4ee5\u6307\u5b9a\u503c<\/td><td>a %= 10 \u7b49\u4ef7\u4e8e a = a % 10<\/td><\/tr><tr><td>**=<\/td><td>\u5bf9\u5de6\u4fa7\u53d8\u91cf\u53d6\u6307\u5b9a\u5e42\u6570<\/td><td>a **= 10 \u7b49\u4ef7\u4e8e a = a ** 10<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5173\u7cfb\u8fd0\u7b97\u7b26\uff08Relational operators\uff09<\/h2>\n\n\n\n<p>\u5173\u7cfb\u8fd0\u7b97\u7b26\u7528\u6765\u6bd4\u8f83\u4e24\u4e2a\u503c\u95f4\u7684\u5927\u5c0f\u5173\u7cfb\uff0c\u5982\u679c\u5173\u7cfb\u6210\u7acb\u4f1a\u8fd4\u56detrue\uff0c\u5982\u679c\u5173\u7cfb\u4e0d\u6210\u7acb\u4f1a\u8fd4\u56defalse\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u7b26\u53f7<\/td><td>\u4f5c\u7528<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>&lt;<\/td><td>\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5927\u4e8e\u53e6\u4e00\u4e2a\u503c<\/td><td>10 &lt; 5<\/td><\/tr><tr><td>&gt;<\/td><td>\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5c0f\u4e8e\u53e6\u4e00\u4e2a\u503c<\/td><td>10 &gt; 5<\/td><\/tr><tr><td>&lt;=<\/td><td>\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5927\u4e8e\u6216\u7b49\u4e8e\u53e6\u4e00\u4e2a\u503c<\/td><td>10 &lt;= 5<\/td><\/tr><tr><td>&gt;=<\/td><td>\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5927\u4e8e\u6216\u7b49\u4e8e\u53e6\u4e00\u4e2a\u503c<\/td><td>10 &gt;= 5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u8fd9\u79cd\u73a9\u610f\u513f\u548c\u6570\u5b66\u4e2d\u7684\u89c4\u5219\u4e00\u6a21\u4e00\u6837\uff0c\u6240\u4ee5\u5e38\u89c4\u60c5\u51b5\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n\n\n\n<p>\u7279\u6b8a\u60c5\u51b5\u5c31\u662f\u975e\u6570\u5b57\u7684\u60c5\u51b5\uff0c\u6bd4\u5982true &gt; false\u8981\u5982\u4f55\u5904\u7406\u3002\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u5bf9\u4e00\u4e2a\u975e\u6570\u5b57\u7684\u503c\u8fdb\u884c\u8fd9\u79cd\u5927\u4e8e\u5c0f\u4e8e\u6bd4\u8f83\u65f6\u4f1a\u81ea\u52a8\u8f6c\u6362\u4e3a\u6570\u5b57\u7136\u540e\u6bd4\u8f83\uff0c\u6240\u4ee5true &gt; false\u7684\u7ed3\u679c\u548c1 &gt; 0\u662f\u76f8\u540c\u7684\uff0c\u6700\u540e\u7ed3\u679c\u4f1a\u8fd4\u56detrue\u3002<\/p>\n\n\n\n<p>\u8fd8\u6709\u4e00\u4e2a\u7279\u6b8a\u60c5\u51b5\u5c31\u662f\u4e24\u4e2a\u5b57\u7b26\u4e32\u6bd4\u8f83\u7684\u60c5\u51b5\uff0c\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u65f6\uff0c\u4e0d\u4f1a\u8f6c\u6362\u4e3a\u6570\u5b57\u8fdb\u884c\u6bd4\u8f83\u800c\u662f\u9010\u4f4d\u7684\u6bd4\u8f83\u6bcf\u4e00\u4e2a\u5b57\u7b26\u7684\u7f16\u7801\u3002\u6bd4\u5982\uff1a&#8217;abd&#8217; &gt; &#8216;abc&#8217;\uff0c\u5b9e\u9645\u4e0a\u4f1a\u6bd4\u8f83\u5b83\u4eec\u7684Unicode\u7f16\u7801\uff0c\u672c\u4f8b\u4e2d\uff0c\u4f1a\u5148\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u4e2a\u5b57\u6bcda\u548ca\u7684\u7f16\u7801\u5927\u5c0f\uff0c\u5982\u679c\u80fd\u6bd4\u8f83\u51fa\u7ed3\u679c\uff0c\u5c31\u4e0d\u4f1a\u518d\u770b\u540e\u8fb9\u7684\u7f16\u7801\uff0c\u5982\u679c\u6bd4\u4e0d\u51fa\u6765\uff0c\u5219\u7ee7\u7eed\u6bd4\u8f83\u7b2c\u4e8c\u4e2a\u5b57\u6bcdb\u548cb\u7684\u5b57\u7b26\u7f16\u7801\uff0c\u6709\u7ed3\u679c\u4e0d\u6bd4\u4e86\uff0c\u6ca1\u6709\u7ed3\u679c\uff0c\u7ee7\u7eed\u6bd4\u8f83\u7b2c\u4e09\u4e2a\u5b57\u6bcdd\u548cc\u7684\u5b57\u7b26\u7f16\u7801\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>a\u7684\u7f16\u7801\u662f97\uff0cb\u7684\u662f98\uff0cc\u7684\u662f99\uff0cd\u7684\u662f100\uff0c\u6240\u4ee5\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u5b9e\u9645\u4e0a\u662f\u8fd9\u6837\u6bd4\u7684a\uff0897\uff09b\uff0898\uff09d\uff08100\uff09&gt; a\uff0897\uff09b\uff0898\uff09d\uff0899\uff09\u3002\u7b2c\u4e00\u4f4da\uff0c97\u548c97\u76f8\u7b49\uff0c\u7ee7\u7eed\u770b\u7b2c\u4e8c\u4f4db\uff0c98\u548c98\u76f8\u7b49\uff0c\u518d\u770b\u7b2c\u4e09\u4f4dd\u548cc\uff0cd\u662f100\uff0cc\u662f99\uff0c100\u5927\u4e8e99\uff0c\u6210\u7acb\u8fd4\u56detrue\uff0c\u6240\u4ee5&#8217;abd&#8217; &gt; &#8216;abc&#8217; \u4f1a\u8fd4\u56detrue\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"143\" height=\"40\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192756668.png\" alt=\"\" class=\"wp-image-6077\"\/><figcaption>\u7ed3\u679c<\/figcaption><\/figure><\/div>\n\n\n\n<p>\u8fd9\u91cc\u53c8\u4e00\u4e2a\u95ee\u9898\u9700\u8981\u6ce8\u610f\u5982\u679c\u8981\u6bd4\u8f83\u6570\u5b57\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u6bd4\u5982&#8221;14&#8243; &gt; &#8220;4&#8221;\uff0c\u6b64\u65f6\u6bd4\u8f83\u7684\u4f9d\u7136\u662f\u5b57\u7b26\u7f16\u7801\uff0c\u7531\u4e8e1\u7684\u7f16\u7801\u5c0f\u4e8e4\u7684\u7f16\u7801\u6240\u4ee5\u8fd9\u4e2a\u5224\u65ad\u4f1a\u8fd4\u56defalse\u3002\u8fd9\u4e2a\u95ee\u9898\u4e00\u5b9a\u8981\u6ce8\u610f\uff0c\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u65f6\u786e\u5b9a\u4e00\u4e0b\u4f60\u662f\u5426\u771f\u7684\u76f8\u6bd4\u8f83\u5b83\u4eec\u7684\u5b57\u7b26\u7f16\u7801\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"113\" height=\"39\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192802152.png\" alt=\"\" class=\"wp-image-6078\"\/><figcaption>\u7ed3\u679c<\/figcaption><\/figure><\/div>\n\n\n\n<p>\u5229\u7528\u8fd9\u4e2a\u7279\u6027\u53ef\u4ee5\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u5927\u5c0f\u6765\u5c06\u5b57\u7b26\u4e32\u6309\u7167\u5b57\u6bcd\u987a\u5e8f\u6392\u5e8f\uff0c\u4f46\u662f\u5bf9\u4e8e\u6c49\u5b57\u6765\u8bf4\u4f5c\u7528\u5c31\u4e0d\u592a\u660e\u663e\u4e86\u3002\u5728Unicode\u7f16\u7801\u8868\u4e2d\uff0c\u4e2d\u6587\u662f\u6309\u7167\u504f\u65c1\u90e8\u9996\u8fdb\u884c\u6392\u5e8f\u7684\uff0c\u6240\u4ee5\u6bd4\u8f83\u65f6\u4e0d\u4e00\u5b9a\u80fd\u8fbe\u5230\u7684\u9884\u671f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u76f8\u7b49\u8fd0\u7b97\u7b26\uff08Equality operators\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u7b26\u53f7<\/td><td>\u4f5c\u7528<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>==<\/td><td>\u6bd4\u8f83\u4e24\u4e2a\u503c\u662f\u5426\u76f8\u7b49<\/td><td>1 == 1<\/td><\/tr><tr><td>!=<\/td><td>\u6bd4\u8f83\u4e24\u4e2a\u503c\u662f\u5426\u4e0d\u7b49<\/td><td>1 != 1<\/td><\/tr><tr><td>===<\/td><td>\u6bd4\u8f83\u4e24\u4e2a\u503c\u662f\u5426\u5168\u7b49<\/td><td>1 === 1<\/td><\/tr><tr><td>!==<\/td><td>\u6bd4\u8f83\u4e24\u4e2a\u503c\u662f\u5426\u4e0d\u5168\u7b49<\/td><td>1 !== 1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u76f8\u7b49\u8fd0\u7b97\u7b26\uff0c\u987e\u540d\u601d\u4e49\u7528\u6765\u6bd4\u8f83\u4e24\u4e2a\u503c\u662f\u5426\u76f8\u7b49\uff0c\u5982\u679c\u76f8\u7b49\u8fd4\u56detrue\u5426\u5219\u8fd4\u56defalse\u3002\u6bd4\u5982\uff1a1 == 1 \u4f1a\u8fd4\u56detrue\uff0c5 == 6 \u4f1a\u8fd4\u56defalse\u3002&#8217;hello&#8217; == &#8216;hello&#8217; \u4e5f\u4f1a\u8fd4\u56detrue\u3002\u4f46\u662f\u5bf9\u4e8eJS\u6765\u8bb2\u8fd9\u4e9b\u4e1c\u897f\u90fd\u4f1a\u975e\u5e38\u597d\u7406\u89e3\u3002\u4f46\u662fJS\u4e2d\u6700\u5947\u7279\u7684\u70b9\u5c31\u5728\u4e8e\u4e0d\u540c\u7c7b\u578b\u4e4b\u95f4\u7684\u6bd4\u8f83\uff0c\u4e5f\u5c31\u662f\u7c7b\u4f3c\u4e8e 1 == true \u4f1a\u5982\u679c\u6bd4\u8f83\u5462\uff1f<\/p>\n\n\n\n<p>\u5bf9\u4e0d\u540c\u7c7b\u578b\u7684\u503c\u8fdb\u884c\u76f8\u7b49\u6bd4\u8f83\u65f6\uff0c\u6d4f\u89c8\u5668\uff08JS\u89e3\u6790\u5668\uff09\u4f1a\u81ea\u52a8\u5c06\u5176\u8f6c\u6362\u4e3a\u76f8\u540c\u7684\u7c7b\u578b\u7136\u540e\u8fdb\u884c\u6bd4\u8f83\u3002\u6240\u4ee51\u548ctrue\u7684\u7c7b\u578b\u4e0d\u540c\uff0c\u6240\u4ee5\u6d4f\u89c8\u5668\u4f1a\u5148\u5c06\u5b83\u4eec\u8f6c\u6362\u4e3a\u76f8\u540c\u7c7b\u578b\uff0c\u8f6c\u6362\u4e3a\u4ec0\u4e48\u7c7b\u578b\u5462\uff1f\u901a\u5e38\u4f1a\u8f6c\u6362\u4e3a\u6570\u503c\u7136\u540e\u6bd4\u8f83\uff0c\u8fd9\u91cc\u4f1a\u5c06true\u8f6c\u6362\u4e3a1\uff0c\u7136\u540e\u518d\u548c1\u8fdb\u884c\u6bd4\u8f83\uff0c\u6240\u4ee5\u7ed3\u679c\u4e3atrue\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"39\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192812860.png\" alt=\"\" class=\"wp-image-6079\"\/><\/figure><\/div>\n\n\n\n<p>\u5373\u4f7f\u6bd4\u8f83\u53cc\u65b9\u4e2d\u6ca1\u6709\u6570\u5b57\uff0c\u4e5f\u4f1a\u8f6c\u6362\u4e3a\u6570\u5b57\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"134\" height=\"76\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192819732.png\" alt=\"\" class=\"wp-image-6080\"\/><\/figure><\/div>\n\n\n\n<p>\u5e03\u5c14\u503ctrue\u548c\u5b57\u7b26\u4e32&#8217;true&#8217;\u8fdb\u884c\u6bd4\u8f83\u65f6\uff0ctrue\u4f1a\u8f6c\u6362\u4e3a1\uff0c&#8217;true&#8217;\u4f1a\u8f6c\u6362\u4e3aNaN\uff0c\u6240\u4ee5\u7ed3\u679c\u4e3afalse\u3002\u5e03\u5c14\u503ctrue\u548c\u5b57\u7b26\u4e32&#8217;1&#8217;\u8fdb\u884c\u6bd4\u8f83\u65f6\uff0c\u4e24\u4e2a\u503c\u90fd\u4f1a\u8f6c\u6362\u4e3a1\uff0c\u6240\u4ee5\u4f1a\u8fd4\u56detrue\u3002<\/p>\n\n\n\n<p>\u51e0\u79cd\u7279\u6b8a\u60c5\u51b5\uff1a<\/p>\n\n\n\n<p>null\u4e0d\u4f1a\u88ab\u8f6c\u6362\u4e3a\u6570\u5b57\u6bd4\u8f83:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"110\" height=\"36\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192826462.png\" alt=\"\" class=\"wp-image-6081\"\/><\/figure><\/div>\n\n\n\n<p>null\u548cundefined\u76f8\u7b49\u6bd4\u8f83\u65f6\u8fd4\u56detrue\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"37\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192832102.png\" alt=\"\" class=\"wp-image-6082\"\/><\/figure><\/div>\n\n\n\n<p>NaN\u548cNaN\u4e0d\u76f8\u7b49\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"119\" height=\"39\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192838461.png\" alt=\"\" class=\"wp-image-6083\"\/><\/figure><\/div>\n\n\n\n<p>\u6bd4\u8f83\u5bf9\u8c61\u65f6\u6bd4\u8f83\u7684\u662f\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"345\" height=\"117\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192845938.png\" alt=\"\" class=\"wp-image-6084\" srcset=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192845938.png 345w, https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192845938-300x102.png 300w\" sizes=\"(max-width: 345px) 100vw, 345px\" \/><\/figure><\/div>\n\n\n\n<p>!=\u8868\u793a\u4e0d\u76f8\u7b49\uff0c\u7528\u6765\u68c0\u67e5\u4e24\u4e2a\u503c\u662f\u5426\u4e0d\u7b49\uff0c\u540c\u6837\u4e5f\u4f1a\u505a\u81ea\u52a8\u7684\u7c7b\u578b\u8f6c\u6362\uff0c\u4e0d\u7ec6\u8bf4\u4e86\uff0c\u76f4\u63a5\u770b\u4e2a\u6848\u4f8b\u3002<\/p>\n\n\n\n<p>1 != 1 \/\/ false<br>1 != &#8216;1&#8217; \/\/ false \u7c7b\u578b\u4e0d\u540c\u4f1a\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362<br>1 != 2 \/\/ true<br>null != undefined \/\/ false<br>NaN != NaN \/\/ true<\/p>\n\n\n\n<p>=== \u8868\u793a\u5168\u7b49\u8fd0\u7b97\uff0c!==\u8868\u793a\u4e0d\u5168\u7b49\uff0c\u548c\u76f8\u7b49\u7684\u533a\u522b\u5728\u4e8e\u5168\u7b49\u4e0d\u4f1a\u8fdb\u884c\u81ea\u52a8\u7684\u7c7b\u578b\u8f6c\u6362\uff0c\u4e24\u4e2a\u503c\u7c7b\u578b\u4e0d\u540c\u76f4\u63a5\u8ba4\u4e3a\u5b83\u4eec\u4e0d\u5168\u7b49\uff0c\u4e0d\u4f1a\u8f6c\u6362\u4e3a\u76f8\u540c\u7684\u7c7b\u578b\u6bd4\u8f83\u3002\u81ea\u5df1\u8bd5\u8bd5\u5427\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u903b\u8f91\u8fd0\u7b97\u7b26\uff08Logical operators\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u7b26\u53f7<\/td><td>\u4f5c\u7528<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>!<\/td><td>\u975e\u8fd0\u7b97\uff0c\u5bf9\u5f53\u524d\u503c\u8fdb\u884c\u53d6\u53cd\u64cd\u4f5c<\/td><td>!true<\/td><\/tr><tr><td>&amp;&amp;<\/td><td>\u4e0e\u8fd0\u7b97\uff0c\u4e24\u4e2a\u503c\u90fd\u4e3atrue\u5219\u8fd4\u56detrue<\/td><td>true &amp;&amp; false<\/td><\/tr><tr><td>||<\/td><td>\u6216\u8fd0\u7b97\uff0c\u4e24\u4e2a\u503c\u6709true\u5219\u8fd4\u56detrue<\/td><td>true || false<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u903b\u8f91\u8fd0\u7b97\u4e3b\u8981\u7528\u6765\u8fdb\u884c\u903b\u8f91\u5224\u65ad\uff0c\u5176\u4e2d!\u8868\u793a\u975e\u8fd0\u7b97\uff0c\u5373\u76f4\u63a5\u5bf9\u5e03\u5c14\u503c\u8fdb\u884c\u53d6\u53cd\u64cd\u4f5c\uff0ctrue\u53d8false\uff0cfalse\u53d8true\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"79\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192854192.png\" alt=\"\" class=\"wp-image-6085\"\/><\/figure><\/div>\n\n\n\n<p>\u7531\u4e8e\u903b\u8f91\u8fd0\u7b97\u4e5f\u53ef\u4ee5\u5bf9\u975e\u5e03\u5c14\u503c\u8fdb\u884c\uff0c\u6240\u4ee5\u66f4\u52a0\u901a\u7528\u7684\u63cf\u8ff0\u662f\uff1a\u5982\u679c\u8be5\u503c\u53ef\u4ee5\u88ab\u8f6c\u6362true\uff0c\u5219\u8fd4\u56defalse\u3002\u5982\u679c\u8be5\u503c\u53ef\u4ee5\u88ab\u8f6c\u6362\u4e3afalse\uff0c\u5219\u8fd4\u56detrue\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a!1\uff0c1\u5982\u679c\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u5e94\u8be5\u4e3atrue\uff0c\u6240\u4ee5!1\u4f1a\u8fd4\u56defalse\u3002!&#8217;hello&#8217;\uff0c&#8217;hello&#8217;\u5982\u679c\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u5e94\u8be5\u4e3afalse\uff0c\u6240\u4ee5!&#8217;hello&#8217;\u4f1a\u8fd4\u56defalse\u3002!null\uff0cnull\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u662ffalse\uff0c\u6240\u4ee5!null\u4f1a\u8f6c\u6362\u4e3atrue\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"118\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192902985.png\" alt=\"\" class=\"wp-image-6086\"\/><\/figure><\/div>\n\n\n\n<p>\u770b\u5230\u8fd9\u4f60\u53ef\u80fd\u4f1a\u89c9\u5f97\u6709\u4e00\u70b9\u5947\u602a\uff0c\u6240\u4ee5\u9700\u8981\u5efa\u7acb\u4e00\u4e2a\u6982\u5ff5\uff0cJS\u4e2d\u7684\u503c\u53ef\u4ee5\u8fdb\u884c\u4e92\u76f8\u8f6c\u6362\uff0c\u4e00\u4e2a\u5b57\u7b26\u4e32\u53ef\u4ee5\u8f6c\u6362\u4e3a\u6570\u503c\u4e5f\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002\u6362\u53e5\u8bdd\u8bf4\u6240\u6709\u7684\u503c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u90fd\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002\u6709\u7684\u503c\u4f1a\u8f6c\u6362\u4e3atrue\uff0c\u6709\u7684\u503c\u4f1a\u8f6c\u6362\u4e3afalse\u3002<\/p>\n\n\n\n<p>\u4f1a\u8f6c\u6362\u4e3afalse\u7684\u60c5\u51b5\uff1a<br>0\u3001-0\u3001null\u3001false\u3001NaN\u3001undefined\u3001\u7a7a\u5b57\u7b26\u4e32\uff08&#8221;&#8221;\uff09\u90fd\u4f1a\u8f6c\u6362\u4e3afalse<\/p>\n\n\n\n<p>\u4f1a\u8f6c\u6362\u4e3atrue\u7684\u60c5\u51b5\uff1a<br>\u4efb\u610f\u5bf9\u8c61\u3001\u6570\u7ec4\u3001\u975e\u7a7a\u5b57\u7b26\u4e32\uff08\u5373\u4f7f\u662f\u5b57\u7b26\u4e32&#8221;false&#8221;\uff09\u90fd\u4f1a\u8f6c\u6362\u4e3atrue<\/p>\n\n\n\n<p>\u6240\u4ee5\u5bf9\u4e00\u4e2a\u503c\u505a\u975e\u8fd0\u7b97\u65f6\uff0c\u5982\u679c\u5b83\u7684\u503c\u662ftrue\uff0c\u53d6\u53cd\u540e\u5c31\u53d8\u6210false\u3002\u5982\u679c\u5b83\u7684\u503c\u662ffalse\uff0c\u53d6\u53cd\u540e\u5c31\u53d8\u6210\u7684\u4e86true\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5bf9\u4e00\u4e2a\u503c\u8fdb\u884c\u53bb\u4e24\u6b21\u53cd\uff0c\u6765\u5c06\u5176\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"222\" height=\"157\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192910174.png\" alt=\"\" class=\"wp-image-6087\"\/><\/figure><\/div>\n\n\n\n<p>&amp;&amp;\u8868\u793a\u4e0e\u8fd0\u7b97\uff0c\u4e0e\u8fd0\u7b97\u9700\u8981\u4e24\u4e2a\u503c\uff0c\u5f53\u4e24\u4e2a\u503c\u90fd\u4e3atrue\u7684\u65f6\u5019\uff0c\u4f1a\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"153\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192917686.png\" alt=\"\" class=\"wp-image-6088\"\/><\/figure><\/div>\n\n\n\n<p>\u540c\u6837\u7531\u4e8e\u53ef\u4ee5\u5bf9\u975e\u5e03\u5c14\u4f7f\u7528\uff0c\u5b83\u8fd8\u6709\u4e00\u4e2a\u66f4\u52a0\u901a\u7528\u7684\u63cf\u8ff0\u662f\uff1a\u53c2\u4e0e\u4e0e\u8fd0\u7b97\u7684\u4e24\u4e2a\u503c\u4e2d\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u53ef\u4ee5\u8f6c\u6362\u4e3atrue\uff0c\u5219\u8fd4\u56de\u7b2c\u4e8c\u4e2a\u503c\uff0c\u5426\u5219\u8fd4\u56de\u7b2c\u4e00\u4e2a\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"121\" height=\"78\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192924338.png\" alt=\"\" class=\"wp-image-6089\"\/><figcaption>\u4e3b\u8981\u770b\u7b2c\u4e00\u4e2a\u503c<\/figcaption><\/figure><\/div>\n\n\n\n<p>||\u8868\u793a\u6216\u8fd0\u7b97\uff0c\u6216\u8fd0\u7b97\u4e5f\u662f\u9700\u8981\u4e24\u4e2a\u503c\uff0c\u4e24\u4e2a\u503c\u4e2d\u6709\u4e00\u4e2a\u4e3atrue\uff0c\u5219\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"171\" height=\"159\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192931137.png\" alt=\"\" class=\"wp-image-6090\"\/><\/figure><\/div>\n\n\n\n<p>\u5bf9\u4e8e\u975e\u5e03\u5c14\u503c\uff0c\u66f4\u52a0\u901a\u7528\u7684\u63cf\u8ff0\u662f\uff1a\u53c2\u4e0e\u8fd0\u7b97\u7684\u4e24\u4e2a\u503c\u4e2d\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u53ef\u4ee5\u8f6c\u6362\u4e3atrue\uff0c\u5219\u8fd4\u56de\u7b2c\u4e00\u4e2a\u503c\uff0c\u5426\u5219\u8fd4\u56de\u7b2c\u4e8c\u4e2a\u503c\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"131\" height=\"78\" src=\"https:\/\/my-wp.oss-cn-beijing.aliyuncs.com\/wp-content\/uploads\/2022\/05\/20220514192938593.png\" alt=\"\" class=\"wp-image-6091\"\/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u6761\u4ef6\u8fd0\u7b97\u7b26\uff08Conditional operator\uff09<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>\u6761\u4ef6\u8868\u8fbe\u5f0f?\u8bed\u53e51:\u8bed\u53e52<\/code><\/pre>\n\n\n\n<p>\u6761\u4ef6\u8fd0\u7b97\u7b26\u4e5f\u88ab\u79f0\u4e3a\u4e09\u5143\u8fd0\u7b97\u7b26\u3002\u6761\u4ef6\u8fd0\u7b97\u7b26\u9700\u8981\u4e09\u4e2a\u503c\u3002\u7b2c\u4e00\u4e2a\u503c\u88ab\u79f0\u4e3a\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u7b2c\u4e8c\u4e2a\u548c\u7b2c\u4e09\u4e2a\u503c\u662f\u4e00\u4e2a\u8bed\u53e5\u3002\u4e24\u4e2a\u8bed\u53e5\uff08\u8bed\u53e51\u548c\u8bed\u53e52\uff09\u53ea\u4f1a\u6267\u884c\u5176\u4e2d\u4e00\u4e2a\uff0c\u6700\u7ec8\u90a3\u4e2a\u4f1a\u6267\u884c\u6709\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u51b3\u5b9a\uff0c\u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u4e3atrue\uff0c\u5219\u6267\u884c\u8bed\u53e51\uff0c\u7ed3\u679c\u4e3afalse\uff0c\u5219\u6267\u884c\u8bed\u53e52\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>10 &gt; 20 ? '10\u6bd420\u5927' : '20\u6bd410\u5927'<\/code><\/pre>\n\n\n\n<p>\u4e0a\u4f8b\u4e2d10 &gt; 20\u5373\u662f\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u6bcf\u4e00\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\u90fd\u4f1a\u88ab\u8f6c\u6362\u4e3a\u4e00\u4e2a\u5e03\u5c14\u503c\u300210 &gt; 20\u7684\u8fd0\u7b97\u7ed3\u679c\u4e3afalse\uff0c\u6240\u4ee5\u4f1a\u6267\u884c\u8868\u8fbe\u5f0f2\uff0c\u4e5f\u5c31\u662f\u5b57\u7b26\u4e32&#8217;20\u6bd410\u5927&#8217;\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u5982\u679c\u4f60\u7684\u8868\u8fbe\u5f0f\u6700\u7ec8\u8fd4\u56de\u7684\u503c\u4e0d\u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u6d4f\u89c8\u5668\u4e5f\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff0c\u7136\u540e\u5224\u65ad\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u5143\u8fd0\u7b97\u7b26\uff08Unary operators\uff09 \u4e00\u5143\u8fd0\u7b97\u7b26\u6307\u53ea\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\u7684\u8fd0\u7b97\u7b26\u3002 \u7b26\u53f7 \u4f5c\u7528 \u793a\u4f8b + \u6b63\u53f7 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6084,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[241],"tags":[200,234,247],"_links":{"self":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6075"}],"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=6075"}],"version-history":[{"count":2,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6075\/revisions"}],"predecessor-version":[{"id":6092,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6075\/revisions\/6092"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/media\/6084"}],"wp:attachment":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6075"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}