{"id":6144,"date":"2020-05-09T19:53:05","date_gmt":"2020-05-09T11:53:05","guid":{"rendered":"https:\/\/www.lilichao.com\/?p=6144"},"modified":"2022-05-14T19:55:50","modified_gmt":"2022-05-14T11:55:50","slug":"%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=6144","title":{"rendered":"\u7c7b"},"content":{"rendered":"\n

\u7c7b\uff08\u6216\u6784\u9020\u51fd\u6570\uff09\u662f\u4e00\u79cd\u4e13\u95e8\u7528\u6765\u521b\u5efa\u5bf9\u8c61\u7684\u51fd\u6570\u3002\u5728\u65e9\u671f\u7684JS\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u901a\u8fc7function\u6765\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u3002\u4f46\u662f\u90a3\u79cd\u65b9\u5f0f\u5e76\u4e0d\u662f\u5341\u5206\u53cb\u597d\uff0c\u4e00\u6765\uff0c\u521b\u5efa\u8d77\u6765\u4f1a\u6bd4\u8f83\u7684\u9ebb\u70e6\uff0c\u9700\u8981\u5355\u72ec\u901a\u8fc7\u539f\u578b\u53bb\u6dfb\u52a0\u516c\u5171\u7684\u5c5e\u6027\uff08\u65b9\u6cd5\uff09\u3002\u4e8c\u6765\uff0c\u5b83\u7684\u521b\u5efa\u65b9\u5f0f\u548c\u51fd\u6570\u592a\u7c7b\u4f3c\u4e0d\u5bb9\u6613\u533a\u5206\u3002<\/p>\n\n\n\n

\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5728ES2015\u4e2d\u63d0\u4f9b\u65b0\u7684\u5b9a\u4e49\u7c7b\u7684\u8bed\u6cd5\u3002\u65b0\u7684\u8bed\u6cd5\u4e3b\u8981\u6709\u4e24\u79cd\u4e66\u5199\u65b9\u5f0f\uff1a<\/p>\n\n\n\n

class name [extends otherName] {\n  \/\/ class body\n}<\/code><\/pre>\n\n\n\n
const MyClass = class [className] [extends otherClassName] {\n    \/\/ class body\n};<\/code><\/pre>\n\n\n\n
\u4e24\u79cd\u65b9\u5f0f\u6548\u679c\u57fa\u672c\u4e0a\u4e00\u81f4\u7684\uff0c\u6709\u70b9\u7c7b\u4f3c\u4e8e\u521b\u5efa\u51fd\u6570\u7684\u4e24\u79cd\u65b9\u5f0f\uff08\u51fd\u6570\u58f0\u660e\u548c\u51fd\u6570\u8868\u8fbe\u5f0f\uff09\uff0c\u8fd9\u91cc\u6211\u4eec\u4ee5\u7b2c\u4e00\u79cd\u65b9\u5f0f\u4e3a\u4f8b\u6765\u5b9a\u4e49\u4e00\u4e2aPerson\u7c7b\u3002<\/p>\n\n\n\n
class Person{\n     \n}\n \nlet p1 = new Person();<\/code><\/pre>\n\n\n\n
\u8fd9\u6837\u6211\u4eec\u5c31\u5b9a\u4e49\u597d\u4e86\u4e00\u4e2aPerson\u7c7b\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7new\u8c03\u7528\u4ece\u800c\u521b\u5efa\u5bf9\u8c61\u3002\u8fd9\u79cd\u65b9\u5f0f\u672c\u8d28\u4e0a\u548c\u4e4b\u524d\u901a\u8fc7function\u521b\u5efa\u7c7b\u7684\u5f62\u5f0f\u662f\u4e00\u6837\u7684\uff0c\u4f46\u8fd9\u79cd\u65b9\u5f0f\u597d\u5728\u660e\u786e\u4e86\u6211\u4eec\u662f\u5728\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u800c\u4e0d\u662f\u522b\u7684\u4ec0\u4e48\u4e1c\u897f\u3002<\/p>\n\n\n\n
\u6dfb\u52a0\u65b9\u6cd5<\/h2>\n\n\n\n
\u4e00\u4e2a\u7a7a\u7c7b\u6709\u4ec0\u4e48\u7528\u5462\uff1f\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u5411\u4e00\u4e2a\u7c7b\u4e2d\u6dfb\u52a0\u65b9\u6cd5\u3002\u6dfb\u52a0\u65b9\u6cd5\u975e\u5e38\u7b80\u5355\uff0c\u76f4\u63a5\u5728\u7c7b\u4e2d\u8bbe\u7f6e\u5373\u53ef\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
class name [extends otherName] {<\/code>\n    \u65b9\u6cd51(){<\/code>\n\n    }<\/code>\n\n    \u65b9\u6cd52(){<\/code>\n\n    }<\/code>\n}<\/code><\/pre>\n\n\n\n
\u5b9a\u4e49\u65b9\u6cd5\u65f6\u4e0d\u8bb8\u8981\u4f7f\u7528function\u5173\u952e\u5b57\uff0c\u5728\u7c7b\u4e2d\u76f4\u63a5\u8bbe\u7f6e\u65b9\u6cd5\u540d\u5373\u53ef\u3002\u4f8b\u5982\u5411Person\u7c7b\u4e2d\u6dfb\u52a0\u4e24\u4e2a\u65b9\u6cd5run\u548csleep\u3002<\/p>\n\n\n\n
class Person{\n \n      <\/code>\/\/\u5b9a\u4e49run\u65b9\u6cd5\n      <\/code><\/em>run(){\n          console.log('\u6211\u5728\u8dd1');\n      }\n      \n      <\/code>\/\/\u5b9a\u4e49sleep\u65b9\u6cd5\n      <\/code><\/em>sleep(){\n          console.log('\u6211\u5728\u7761\u89c9');\n      }\n }<\/code>\n \nlet p1 = new Person();\np1.run();\/\/\u8c03\u7528run\u65b9\u6cd5\np1.sleep(); \/\/\u8c03\u7528sleep\u65b9\u6cd5<\/code><\/pre>\n\n\n\n
\u5728\u7c7b\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u4f1a\u76f4\u63a5\u8bbe\u7f6e\u5728\u539f\u578b\u4e4b\u4e2d\uff0c\u4e0d\u9700\u8981\u5728\u624b\u52a8\u5411\u539f\u578b\u4e2d\u6dfb\u52a0\uff0c\u8fd9\u6837\u4e00\u6765\u5373\u7b80\u5316\u4e86\u64cd\u4f5c\uff0c\u4e5f\u907f\u514d\u4e86\u521b\u5efa\u91cd\u590d\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u6dfb\u52a0\u5c5e\u6027<\/h2>\n\n\n\n
\u5982\u679c\u9700\u8981\u5411\u793a\u4f8b\u4e2d\u6dfb\u52a0\u5c5e\u6027\uff0c\u9700\u8981\u5728\u7c7b\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5constructor\uff0c\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n\n\n\n
constructor(){}<\/code><\/pre>\n\n\n\n
constructor\u610f\u4e3a\u6784\u9020\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u548c\u5176\u4ed6\u65b9\u6cd5\u4e0d\u540c\uff0c\u4e0d\u9700\u8981\u624b\u52a8\u8c03\u7528\uff0c\u800c\u662f\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u5f53\u6211\u4eec\u8c03\u7528\u7c7b\u521b\u5efa\u5bf9\u8c61\u65f6\uff0c\u5728\u7c7b\u5185\u90e8\u4f1a\u81ea\u52a8\u8c03\u7528\u8be5\u65b9\u6cd5\u5411\u7c7b\u4e2d\u6dfb\u52a0\u5c5e\u6027\uff0c\u53ef\u4ee5\u5c06\u9700\u8981\u7684\u5c5e\u6027\u76f4\u63a5\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u901a\u8fc7this\u5173\u952e\u5b57\u6765\u6dfb\u52a0\u3002<\/p>\n\n\n\n
\u4fee\u6539\u540e\u7c7b\u53d8\u6210\u5982\u4e0b\u7684\u6837\u5b50\uff1a<\/p>\n\n\n\n
class Person {\n \n     constructor(name, age, gender) {\n         this.name = name;\n         this.age = age\n         this.gender = gender;\n     }\n \n     <\/code>\/\/\u5b9a\u4e49run\u65b9\u6cd5\n     <\/code><\/em>run() {\n         console.log(`${this.name}\u5728\u8dd1`);\n     }\n \n     <\/code>\/\/\u5b9a\u4e49sleep\u65b9\u6cd5\n     <\/code><\/em>sleep() {\n         console.log(`${this.name}\u5728\u7761\u89c9`);\n     }\n}\n \nlet p1 = new Person('\u5b59\u609f\u7a7a', 18, '\u7537');\np1.run();\np1.sleep();<\/code><\/pre>\n\n\n\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u6307\u5b9a\u4e86\u53c2\u6570\uff0c\u5728\u521b\u5efa\u7c7b\u65f6\u4e00\u5b9a\u8981\u4f20\u9012\u8fd9\u4e9b\u53c2\u6570\uff0c\u5426\u5219\u5c06\u4f1a\u5bfc\u81f4\u5c5e\u6027\u503c\u53d8\u6210undefined\u3002\u4e0a\u8ff0\u65b9\u5f0f\u548c\u4e0b\u8fb9\u7684\u4ee3\u7801\u662f\u7b49\u4ef7\u7684\uff1a<\/p>\n\n\n\n
function <\/code>Person<\/code><\/em>(name, age, gender){\n     this.name = name;\n     this.age = age;\n     this.gender = gender;\n}<\/code>\n\n<\/code>Person<\/code><\/em>.prototype.run = function(){\n     console.log(`${this.name}\u5728\u8dd1`);\n}\n \n<\/code>Person<\/code><\/em>.prototype.sleep = function(){\n     console.log(`${this.name}\u5728\u7761\u89c9`);\n }<\/code><\/pre>\n\n\n\n
\u9759\u6001\u65b9\u6cd5<\/h2>\n\n\n\n
\u9664\u6b64\u4e4b\u5916\uff0c\u5728\u7c7b\u4e2d\u4e5f\u53ef\u4ee5\u6dfb\u52a0\u9759\u6001\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u6240\u8c13\u7684\u9759\u6001\u65b9\u6cd5\u6307\u7684\u662f\u65b9\u6cd5\u6216\u5c5e\u6027\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u7c7b\u53bb\u83b7\u53d6\uff0c\u800c\u65e0\u9700\u901a\u8fc7\u793a\u4f8b\uff0c\u9759\u6001\u65b9\u6cd5\u53ea\u9700\u5728\u65b9\u6cd5\u524d\u8fb9\u6dfb\u52a0static\u5173\u952e\u5b57\u5373\u53ef\uff1a<\/p>\n\n\n\n
static \u65b9\u6cd5\u540d(){}
static \u5c5e\u6027\u540d=\u5c5e\u6027\u503c\uff1b<\/p>\n\n\n\n
\u793a\u4f8b\uff1a<\/p>\n\n\n\n
class MyClass{
    static a = 'hello'; \/\/ \u9759\u6001\u5c5e\u6027
    static b(){ \/\/ \u9759\u6001\u65b9\u6cd5
        console.log('\u6211\u662f\u9759\u6001\u65b9\u6cd5');
    }
}
MyClass.a; \/\/\u8c03\u7528\u9759\u6001\u5c5e\u6027
MyClass.b(); \/\/\u8c03\u7528\u9759\u6001\u65b9\u6cd5<\/code><\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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