{"id":2499,"date":"2020-03-25T21:17:52","date_gmt":"2020-03-25T13:17:52","guid":{"rendered":"http:\/\/www.yuguoxy.com\/geekhome\/?p=2499"},"modified":"2026-08-18T12:35:25","modified_gmt":"2026-08-18T04:35:25","slug":"es6%e5%9f%ba%e7%a1%80%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=2499","title":{"rendered":"ES6\u57fa\u7840\u7279\u6027"},"content":{"rendered":"
\n

ES6 \u65e5\u5e38\u6700\u5e38\u7528\u7684\u4e00\u6279\u8bed\u6cd5\uff0c\u6838\u5fc3\u5c31\u51e0\u4ef6\u4e8b\uff1alet\/const<\/strong>\u3001\u7bad\u5934\u51fd\u6570<\/strong>\u3001\u6a21\u677f\u5b57\u7b26\u4e32\u3001\u89e3\u6784\u3001\u9ed8\u8ba4\u53c2\u6570\u3001\u5c55\u5f00\u8fd0\u7b97\u7b26\u3001\u5bf9\u8c61\u5b57\u9762\u91cf\u7b80\u5199\u548c class<\/code>\u3002\u5b83\u4eec\u4e0d\u66ff\u4ee3 JavaScript \u539f\u7406\uff0c\u53ea\u662f\u8ba9\u5199\u6cd5\u66f4\u77ed\uff0c\u4e5f\u66f4\u5c11\u8e29 var<\/code> \u7684\u5751\u3002<\/p>\n

\u7f16\u8bd1\u5230 ES5 \u4e4b\u540e\uff0c\u53d8\u91cf\u63d0\u5347\u7b49\u8001\u884c\u4e3a\u4ecd\u53ef\u80fd\u51fa\u73b0\u3002\u771f\u6b63\u8981\u8bb0\u4f4f\u7684\u662f\uff1a\u5757\u7ea7\u4f5c\u7528\u57df\u3001\u7bad\u5934\u51fd\u6570\u6ca1\u6709\u81ea\u5df1\u7684 this<\/code>\u3001const<\/code> \u9501\u7684\u662f\u7ed1\u5b9a\u800c\u4e0d\u662f\u5bf9\u8c61\u5185\u90e8\u3002Ant Design \u6e90\u7801\u91cc\u5927\u91cf\u7528\u8ba1\u7b97\u5c5e\u6027\u540d\u62fc className<\/code>\uff0c\u5b98\u7f51\u89c1 https:\/\/ant.design\/index-cn<\/a>\u3002<\/p>\n\n\n\n\n\n\n\n
\u7279\u6027<\/th>\n\u8981\u70b9<\/th>\n\u6ce8\u610f<\/th>\n<\/tr>\n<\/thead>\n
let \/ const<\/code><\/td>\n\u5757\u7ea7\u4f5c\u7528\u57df\uff0c\u65e0\u53d8\u91cf\u63d0\u5347<\/td>\nconst<\/code> \u5f15\u7528\u7c7b\u578b\u4ecd\u53ef\u6539\u5185\u90e8\u5c5e\u6027<\/td>\n<\/tr>\n
\u7bad\u5934\u51fd\u6570<\/td>\n\u6ca1\u6709\u81ea\u5df1\u7684 this<\/code>\uff0c\u4e0d\u80fd\u5f53\u51fd\u6570\u58f0\u660e<\/td>\ncall\/apply\/bind<\/code> \u6539\u4e0d\u4e86\u6307\u5411<\/td>\n<\/tr>\n
\u89e3\u6784 \/ \u5c55\u5f00<\/td>\n\u5bf9\u8c61\u6309\u5c5e\u6027\u540d\uff0c\u6570\u7ec4\u6309\u987a\u5e8f<\/td>\n\u5269\u4f59\u53c2\u6570\u5fc5\u987b\u653e\u6700\u540e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e00\u3001\u65b0\u7684\u53d8\u91cf\u58f0\u660e\u65b9\u5f0f let\/const<\/h2>\n

\u548c var<\/code> \u76f8\u6bd4\uff0c\u6700\u91cd\u8981\u7684\u4e24\u70b9\u662f\uff1a\u63d0\u4f9b\u5757\u7ea7\u4f5c\u7528\u57df\uff0c\u4ee5\u53ca\u4e0d\u518d\u5177\u5907\u53d8\u91cf\u63d0\u5347\u3002\u5148\u770b\u4e00\u4e2a\u4f1a\u62a5 a is not defined<\/code> \u7684\u4f8b\u5b50\uff1a<\/p>\n

{\n    let a = 20;\n}\nconsole.log(a);  \/\/ a is not defined<\/code><\/pre>\n
\u8fd9\u4e2a\u7b80\u5355\u4f8b\u5b50\u4f1a\u88ab\u7f16\u8bd1\u6210\u7c7b\u4f3c\u4e0b\u9762\u7684\u5f62\u6001\uff08\u7f16\u8bd1\u540e\u7684 ES5 \u4ecd\u53ef\u80fd\u51fa\u73b0\u63d0\u5347\uff0c\u5b9e\u9645\u5f00\u53d1\u91cc\u4e0d\u8981\u4f9d\u8d56\u63d0\u5347\uff09\uff1a<\/p>\n
{\n    let _a = 20;\n}\n\nconsole.log(a);  \/\/ a is not defined\n\/\/ ES5\nconsole.log(a);   \/\/ undefined\nvar a = 20;\n\n\/\/ ES6\nconsole.log(a); \/\/ a is not defined\nlet a = 20;<\/code><\/pre>\n
\u53d8\u91cf\u63d0\u5347\u4e0e let \/ const \u600e\u4e48\u9009<\/h3>\n
\u4ee3\u7801\u7f16\u8bd1\u6210 ES5 \u4e4b\u540e\u4ecd\u7136\u53ef\u80fd\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u8bb0\u4f4f\u5373\u53ef\uff0c\u65e5\u5e38\u5c3d\u91cf\u907f\u514d\u9760\u63d0\u5347\u6765\u5199\u903b\u8f91\u3002\u9762\u8bd5\u9898\u624d\u4f1a\u628a\u63d0\u5347\u7528\u5230\u6781\u7aef\u3002<\/p>\n
\u5168\u9762\u7528 let\/const<\/code> \u66ff\u6362 var<\/code> \u65f6\uff1a\u503c\u4f1a\u88ab\u6539\u7528 let<\/code>\uff0c\u503c\u4e0d\u4f1a\u88ab\u6539\u7528 const<\/code>\uff08\u5e38\u91cf\uff09\u3002\u57fa\u7840\u7c7b\u578b\u9501\u7684\u662f\u503c\u672c\u8eab\uff1b\u5f15\u7528\u7c7b\u578b\u9501\u7684\u662f\u6307\u5411\u8be5\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5f15\u7528\u4e0d\u53d8\u5c31\u53ef\u4ee5\u6539\u5bf9\u8c61\u5185\u90e8\u3002\u8bd5\u56fe\u6539 const<\/code> \u7ed1\u5b9a\u4f1a\u62a5\u9519\u3002<\/p>\n
\u51e0\u4e2a\u4f8b\u5b50\u53ef\u4ee5\u5bf9\u7167\u63e3\u6469\uff1a<\/p>\n
let a = null;\na = 20;\nconst obDev = {\n    a: 20,\n    b: 30\n}\n\nobDev.a = 30;\n\nconsole.log(obDev); \/\/ Object {a: 30, b: 30}\nconst fn = function() {}\nconst a = obDev.a;\n... ...<\/code><\/pre>\n
\u6293\u4f4f\u4e0a\u9762\u8fd9\u4e9b\u7279\u6027\uff0clet\/const<\/code> \u5c31\u591f\u7528\u4e86\u3002\u7ecf\u9a8c\u4e0a const<\/code> \u7684\u573a\u666f\u5f80\u5f80\u6bd4 let<\/code> \u591a\u3002<\/p>\n
\u4e8c\u3001\u7bad\u5934\u51fd\u6570\u7684\u4f7f\u7528<\/h2>\n
ES6 \u6539\u53d8\u7f16\u7801\u4e60\u60ef\uff0c\u5f88\u5927\u4e00\u90e8\u5206\u6765\u81ea\u7bad\u5934\u51fd\u6570\u3002\u5148\u770b\u5199\u6cd5\u5dee\u5f02\uff1a\u5f53\u51fd\u6570\u4f53\u76f4\u63a5 return \u65f6\uff0c\u53ef\u4ee5\u7701\u7565\u82b1\u62ec\u53f7\u3002<\/p>\n
\/\/ es5\nvar fn = function(a, b) {\n    return a + b;\n}\n\n\/\/ es6 \u7bad\u5934\u51fd\u6570\u5199\u6cd5\uff0c\u5f53\u51fd\u6570\u76f4\u63a5\u88abreturn\u65f6\uff0c\u53ef\u4ee5\u7701\u7565\u51fd\u6570\u4f53\u7684\u62ec\u53f7\nconst fn = (a, b) => a + b;\n\n\/\/ es5\nvar foo = function() {\n    var a = 20\uff1b\n    var b = 30;\n    return a + b;\n}\n\n\/\/ es6\nconst foo = () => {\n   const a = 20;\n   const b = 30;\n   return a + b;\n}<\/code><\/pre>\n
\u7bad\u5934\u51fd\u6570\u53ef\u4ee5\u66ff\u6362\u51fd\u6570\u8868\u8fbe\u5f0f\uff0c\u4f46\u4e0d\u80fd\u66ff\u6362\u51fd\u6570\u58f0\u660e\u3002<\/p>\n
\u7bad\u5934\u51fd\u6570\u4e2d\u6ca1\u6709 this<\/h3>\n
\u66f4\u5173\u952e\u7684\u4e00\u70b9\uff1a\u7bad\u5934\u51fd\u6570\u6ca1\u6709\u81ea\u5df1\u7684 this<\/code>\u3002\u4f60\u5728\u91cc\u9762\u5199\u7684 this<\/code> \u4e00\u5b9a\u662f\u5916\u5c42\u7684 this<\/code>\u3002\u6b63\u56e0\u4e3a\u5982\u6b64\uff0c\u4e5f\u5c31\u8c08\u4e0d\u4e0a\u7528 call\/apply\/bind<\/code> \u53bb\u6539\u6307\u5411\u3002React \u7ec4\u4ef6\u4e4b\u95f4\u4f20\u503c\u65f6\uff0c\u8bb0\u4f4f\u8fd9\u70b9\u80fd\u5c11\u8d70\u5f88\u591a\u5f2f\u8def\u3002<\/p>\n
var person = {\n    name: 'tom',\n    getName: function() {\n        return this.name;\n    }\n}\n\n\/\/ \u6211\u4eec\u8bd5\u56fe\u7528ES6\u7684\u5199\u6cd5\u6765\u91cd\u6784\u4e0a\u9762\u7684\u5bf9\u8c61\nconst person = {\n    name: 'tom',\n    getName: () => this.name\n}\n\n\/\/ \u4f46\u662f\u7f16\u8bd1\u7ed3\u679c\u5374\u662f\nvar person = {\n    name: 'tom',\n    getName: function getName() {\n        return undefined.name;\n    }\n};<\/code><\/pre>\n
ES6 \u9ed8\u8ba4\u4e25\u683c\u6a21\u5f0f\uff0cthis<\/code> \u4e0d\u4f1a\u81ea\u52a8\u6307\u5411 window<\/code>\u3002\u7bad\u5934\u51fd\u6570\u672c\u8eab\u53c8\u6ca1\u6709 this<\/code>\uff0c\u4e8e\u662f\u53ea\u80fd\u662f undefined<\/code>\u3002\u8fd9\u79cd\u60c5\u51b5\u5982\u679c\u8fd8\u60f3\u7528 this<\/code>\uff0c\u5c31\u4e0d\u8981\u5199\u6210\u7bad\u5934\u51fd\u6570\u3002<\/p>\n
\/\/ \u53ef\u4ee5\u7a0d\u505a\u6539\u52a8\nconst person = {\n    name: 'tom',\n    getName: function() {\n        return setTimeout(() => this.name, 1000);\n    }\n}\n\n\/\/ \u7f16\u8bd1\u4e4b\u540e\u53d8\u6210\nvar person = {\n    name: 'tom',\n    getName: function getName() {\n        var _this = this;  \/\/ \u4f7f\u7528\u4e86\u6211\u4eec\u5728es5\u65f6\u5e38\u7528\u7684\u65b9\u5f0f\u4fdd\u5b58this\u5f15\u7528\n\n        return setTimeout(function () {\n            return _this.name;\n        }, 1000);\n    }\n};<\/code><\/pre>\n
\u5148\u8bb0\u4f4f\u5199\u6cd5\u548c this \u7684\u7279\u6b8a\u6027\uff0c\u5c01\u88c5 React \u7ec4\u4ef6\u65f6\u518d\u6162\u6162\u4f53\u4f1a\u3002<\/p>\n
\u4e09\u3001\u6a21\u677f\u5b57\u7b26\u4e32<\/h2>\n
\u6a21\u677f\u5b57\u7b26\u4e32\u662f\u4e3a\u4e86\u89e3\u51b3\u7528 + \u62fc\u63a5\u5b57\u7b26\u4e32\u7684\u4e0d\u4fbf\u3002\u529f\u80fd\u5f88\u5f3a\uff0c\u65e5\u5e38\u7528\u6cd5\u5374\u5f88\u7b80\u5355\uff1a<\/p>\n
\/\/ es6\nconst a = 20;\nconst b = 30;\nconst string = `${a}+${b}=${a+b}`;\n\n\/\/ es5\nvar a = 20;\nvar b = 30;\nvar string = a + \"+\" + b + \"=\" + (a + b);<\/code><\/pre>\n
\u7528\u53cd\u5f15\u53f7\u5305\u4f4f\u6574\u6bb5\u5b57\u7b26\u4e32\uff0c\u7528 ${}<\/code> \u5305\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u3002\u5b83\u8fd8\u652f\u6301\u6362\u884c\u7b49\u80fd\u529b\uff0c\u9700\u8981\u65f6\u518d\u67e5\u8d44\u6599\u5373\u53ef\u3002<\/p>\n
\u56db\u3001\u89e3\u6784\u8d4b\u503c<\/h2>\n
\u89e3\u6784\u662f\u4e00\u79cd\u6309\u7ed3\u6784\u53d6\u503c\u7684\u5199\u6cd5\u3002\u5148\u6709\u8fd9\u6837\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n
\/\/ \u9996\u5148\u6709\u8fd9\u4e48\u4e00\u4e2a\u5bf9\u8c61\nconst props = {\n    className: 'tiger-button',\n    loading: false,\n    clicked: true,\n    disabled: 'disabled'\n}<\/code><\/pre>\n
\u53ea\u60f3\u53d6 loading<\/code> \u4e0e clicked<\/code> \u65f6\uff1a<\/p>\n
\/\/ es5\nvar loading = props.loading;\nvar clicked = props.clicked;\n\n\/\/ es6\nconst { loading, clicked } = props;\n\n\/\/ \u7ed9\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u5f53props\u5bf9\u8c61\u4e2d\u627e\u4e0d\u5230loading\u65f6\uff0cloading\u5c31\u7b49\u4e8e\u8be5\u9ed8\u8ba4\u503c\nconst { loading = false, clicked } = props;<\/code><\/pre>\n
\u4ee3\u7801\u91cf\u660e\u663e\u53d8\u5c11\uff0c\u6240\u4ee5\u5230\u5904\u90fd\u80fd\u89c1\u5230\u5b83\uff1a<\/p>\n
\/\/ \u6bd4\u5982\n\/\/ section1 \nimport React, { Component } from 'react';\n\n\/\/ section2\nexport { default } from '.\/Button';\n\n\/\/ section3\nconst { click, loading } = this.props;\nconst { isCheck } = this.state;\n\n\/\/ more  \u4efb\u4f55\u83b7\u53d6\u5bf9\u8c61\u5c5e\u6027\u503c\u7684\u573a\u666f\u90fd\u53ef\u4ee5\u4f7f\u7528\u89e3\u6790\u7ed3\u6784\u6765\u51cf\u5c11\u6211\u4eec\u7684\u4ee3\u7801\u91cf<\/code><\/pre>\n
\u6570\u7ec4\u4e5f\u6709\u81ea\u5df1\u7684\u89e3\u6784\uff1a<\/p>\n
\/\/ es6\nconst arr = [1, 2, 3];\nconst [a, b, c] = arr;\n\n\/\/ es5\nvar arr = [1, 2, 3];\nvar a = arr[0];\nvar b = arr[1];\nvar c = arr[2];<\/code><\/pre>\n
\u6570\u7ec4\u6309\u5e8f\u53f7\u4e00\u4e00\u5bf9\u5e94\uff08\u6709\u5e8f\uff09\uff1b\u5bf9\u8c61\u6309\u5c5e\u6027\u540d\u4e00\u4e00\u5bf9\u5e94\uff08\u65e0\u5e8f\uff09\u3002\u4ece\u5bf9\u8c61\u91cc\u53d6\u5c5e\u6027\u65f6\uff0c\u89e3\u6784\u66f4\u5e38\u7528\u3002<\/p>\n
\u4e94\u3001\u51fd\u6570\u9ed8\u8ba4\u53c2\u6570<\/h2>\n
\u4ee5\u524d\u4e0d\u80fd\u76f4\u63a5\u7ed9\u51fd\u6570\u6307\u5b9a\u9ed8\u8ba4\u53c2\u6570\uff0c\u5e38\u89c1\u5199\u6cd5\u662f\uff1a<\/p>\n
function add(x, y) {\n    var x = x || 20;\n    var y = y || 30;\n    return x + y;\n}\n\nconsole.log(add()); \/\/ 50<\/code><\/pre>\n
\u7f3a\u70b9\u662f\uff1a\u4f20\u5165 false<\/code> \u8fd9\u7c7b\u5047\u503c\u65f6\u4ecd\u4f1a\u843d\u5230\u9ed8\u8ba4\u503c\uff0c\u672a\u5fc5\u662f\u672c\u610f\u3002ES6 \u7684\u9ed8\u8ba4\u503c\u5199\u6cd5\uff1a<\/p>\n
function add(x = 20, y = 30) {\n    return x + y;\n}\n\nconsole.log(add());<\/code><\/pre>\n
\u5b9e\u9645\u5f00\u53d1\u91cc\u7ed9\u53c2\u6570\u52a0\u5408\u9002\u7684\u9ed8\u8ba4\u503c\uff0c\u4e5f\u80fd\u8ba9\u4eba\u4e00\u773c\u770b\u51fa\u53c2\u6570\u5f62\u6001\uff1a<\/p>\n
const ButtonGroupProps = {\n    size: 'normal',\n    className: 'xxxx-button-group',\n    borderColor: '#333'\n}\n\nexport default function ButtonGroup(props = ButtonGroupProps) {\n    ... ...\n}<\/code><\/pre>\n
\u516d\u3001\u5c55\u5f00\u8fd0\u7b97\u7b26<\/h2>\n
ES6 \u7528 ...<\/code> \u8868\u793a\u5c55\u5f00\uff0c\u53ef\u4ee5\u628a\u6570\u7ec4\u6216\u5bf9\u8c61\u644a\u5f00\uff1a<\/p>\n
const arr1 = [1, 2, 3];\nconst arr2 = [...arr1, 10, 20, 30];\n\n\/\/ \u8fd9\u6837\uff0carr2 \u5c31\u53d8\u6210\u4e86[1, 2, 3, 10, 20, 30];<\/code><\/pre>\n
\u5c55\u5f00\u5bf9\u8c61\u4e5f\u80fd\u5f97\u5230\u7c7b\u4f3c\u7ed3\u679c\uff08\u7c7b\u4f3c Object.assign\uff09\uff1a<\/p>\n
const obj1 = {\n  a: 1,\n  b: 2, \n  c: 3\n}\n\nconst obj2 = {\n  ...obj1,\n  d: 4,\n  e: 5,\n  f: 6\n}\n\n\/\/ \u7ed3\u679c\u7c7b\u4f3c\u4e8e const obj2 = Object.assign({}, obj1, {d: 4})<\/code><\/pre>\n
\u5b83\u8fd8\u5e38\u548c\u89e3\u6784\u4e00\u8d77\u7528\u3002React \u5c01\u88c5\u7ec4\u4ef6\u65f6\uff0c\u4e0d\u786e\u5b9a props \u8fd8\u4f1a\u8fdb\u6765\u591a\u5c11\u5b57\u6bb5\uff0c\u5c31\u7528\u5c55\u5f00\u5904\u7406\u5269\u4f59\u6570\u636e\uff1a<\/p>\n
\/\/ \u8fd9\u79cd\u65b9\u5f0f\u5728react\u4e2d\u5341\u5206\u5e38\u7528\nconst props = {\n  size: 1,\n  src: 'xxxx',\n  mode: 'si'\n}\n\n\nconst { size, ...others } = props;\n\nconsole.log(others)\n\n\/\/ \u7136\u540e\u518d\u5229\u7528\u6682\u5f00\u8fd0\u7b97\u7b26\u4f20\u9012\u7ed9\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0c\u518d\u4ee5\u540e\u5c01\u88c5react\u7ec4\u4ef6\u65f6\u4f1a\u5927\u91cf\u4f7f\u7528\u5230\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6b63\u5728\u5b66\u4e60react\u7684\u540c\u5b66\u4e00\u5b9a\u8981\u641e\u61c2\u8fd9\u79cd\u4f7f\u7528\u65b9\u5f0f\n<button {...others} size={size} \/><\/code><\/pre>\n
\u653e\u5728\u51fd\u6570\u53c2\u6570\u91cc\u8868\u793a\u4e0d\u5b9a\u53c2\uff0c\u800c\u4e14\u5fc5\u987b\u653e\u5728\u6700\u540e\uff0c\u5426\u5219\u62a5\u9519\uff1a<\/p>\n
\/\/ \u6240\u6709\u53c2\u6570\u4e4b\u548c\nconst add = (a, b, ...more) => {\n    return more.reduce((m, n) => m + n) + a + b\n}\n\nconsole.log(add(1, 23, 1, 2, 3, 4, 5)) \/\/ 39<\/code><\/pre>\n
\u521a\u5f00\u59cb\u4f1a\u7ed5\u8111\uff0c\u573a\u666f\u8bb0\u719f\u4e4b\u540e\u523b\u610f\u591a\u7528\u51e0\u6b21\u5c31\u987a\u4e86\u3002<\/p>\n
\u4e03\u3001\u5bf9\u8c61\u5b57\u9762\u91cf\u4e0e class<\/h2>\n
\u5c5e\u6027\u540d\u548c\u53d8\u91cf\u540c\u540d\u65f6\u53ef\u4ee5\u7b80\u5199\uff1a<\/p>\n
const name = 'Jane';\nconst age = 20\n\n\/\/ es6\nconst person = {\n  name,\n  age\n}\n\n\/\/ es5\nvar person = {\n  name: name,\n  age: age\n};<\/code><\/pre>\n
\u6a21\u5757\u5bf9\u5916\u63d0\u4f9b\u63a5\u53e3\u65f6\u540c\u6837\u9002\u7528\uff1a<\/p>\n
const getName = () => person.name;\nconst getAge = () => person.age;\n\n\/\/ commonJS\u7684\u65b9\u5f0f\nmodule.exports = { getName, getAge }\n\n\/\/ ES6 modules\u7684\u65b9\u5f0f\nexport default { getName, getAge  }<\/code><\/pre>\n
\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u7b80\u5199\uff08\u4e0d\u8981\u7528\u7bad\u5934\u51fd\u6570\u7684\u8bdd\uff0cthis \u4ecd\u662f\u719f\u6089\u7684\u90a3\u5957\uff09\uff1a<\/p>\n
\/\/ es6\nconst person = {\n  name,\n  age,\n  getName() { \/\/ \u53ea\u8981\u4e0d\u4f7f\u7528\u7bad\u5934\u51fd\u6570\uff0cthis\u5c31\u8fd8\u662f\u6211\u4eec\u719f\u6089\u7684this\n    return this.name\n  }\n}\n\n\/\/ es5\nvar person = {\n  name: name,\n  age: age,\n  getName: function getName() {\n    return this.name;\n  }\n};<\/code><\/pre>\n
\u4e2d\u62ec\u53f7\u53ef\u4ee5\u628a\u53d8\u91cf\u5f53\u6210\u5c5e\u6027\u540d\uff1a<\/p>\n
const name = 'Jane';\nconst age = 20\n\nconst person = {\n[name]: true,\n[age]: true\n}<\/code><\/pre>\n
Ant Design \u6e90\u7801\u91cc\u5927\u91cf\u7528\u8fd9\u79cd\u65b9\u5f0f\u62fc\u63a5\u5f53\u524d\u5143\u7d20\u7684 className\uff1a<\/p>\n
let alertCls = classNames(prefixCls, {\n[`${prefixCls}-${type}`]: true,\n[`${prefixCls}-close`]: !this.state.closing,\n[`${prefixCls}-with-description`]: !!description,\n[`${prefixCls}-no-icon`]: !showIcon,\n[`${prefixCls}-banner`]: !!banner,\n }, className);<\/code><\/pre>\n
Ant Design \u662f\u8ba4\u53ef\u5ea6\u5f88\u9ad8\u7684 UI \u7ec4\u4ef6\u5e93\uff0c\u5b98\u65b9\u7528 React \u5b9e\u73b0\uff0c\u4e5f\u6709 Vue \u7248\u672c\u3002\u5b98\u7f51\uff1ahttps:\/\/ant.design\/index-cn<\/a>\u3002<\/p>\n
class<\/h3>\n
Class \u662f\u521b\u5efa\u5bf9\u8c61\u7684\u8bed\u6cd5\u7cd6\u3002\u719f\u6089 ES5 \u9762\u5411\u5bf9\u8c61\u7684\u8bdd\uff0c\u9664\u4e86\u5199\u6cd5\u4e0d\u540c\uff0c\u5e76\u6ca1\u6709\u96be\u7406\u89e3\u7684\u65b0\u6982\u5ff5\uff1a<\/p>\n
\/\/ ES5\n\/\/ \u6784\u9020\u51fd\u6570\nfunction Person(name, age) {\n  this.name = name;\n  this.age = age;\n}\n\n\/\/ \u539f\u578b\u65b9\u6cd5\nPerson.prototype.getName = function() {\n  return this.name\n}\n\n\/\/ ES6\nclass Person {\n  constructor(name, age) {  \/\/ \u6784\u9020\u51fd\u6570\n    this.name = name;\n    this.age = age;\n  }\n\n  getName() {  \/\/ \u539f\u578b\u65b9\u6cd5\n    return this.name\n  }\n}<\/code><\/pre>\n
Babel \u4f1a\u628a ES6 \u7f16\u8bd1\u6210 Object.defineProperty \u90a3\u4e00\u5957\uff0cget\/set \u7b49\u53ef\u53c2\u8003\u300aJavaScript \u9ad8\u7ea7\u7a0b\u5e8f\u8bbe\u8ba1\u300b\u3002\u5b9e\u9645\u4f7f\u7528\u65f6\u51e0\u79cd\u5199\u6cd5\u5bf9\u5e94\u7684 ES5 \u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n
class Person {\n  constructor(name, age) {  \/\/ \u6784\u9020\u51fd\u6570\n    this.name = name;\n    this.age = age;\n  }\n\n  getName() {   \/\/ \u8fd9\u79cd\u5199\u6cd5\u8868\u793a\u5c06\u65b9\u6cd5\u6dfb\u52a0\u5230\u539f\u578b\u4e2d\n    return this.name\n  }\n\n  static a = 20;  \/\/ \u7b49\u540c\u4e8e Person.a = 20\n\n  c = 20;   \/\/ \u8868\u793a\u5728\u6784\u9020\u51fd\u6570\u4e2d\u6dfb\u52a0\u5c5e\u6027 \u5728\u6784\u9020\u51fd\u6570\u4e2d\u7b49\u540c\u4e8e this.c = 20\n\n\/\/ \u7bad\u5934\u51fd\u6570\u7684\u5199\u6cd5\u8868\u793a\u5728\u6784\u9020\u51fd\u6570\u4e2d\u6dfb\u52a0\u65b9\u6cd5\uff0c\u5728\u6784\u9020\u51fd\u6570\u4e2d\u7b49\u540c\u4e8ethis.getAge = function() {}\n  getAge = () => this.age   \n\n}<\/code><\/pre>\n
\u7bad\u5934\u51fd\u6570\u4ecd\u7136\u8981\u6ce8\u610f this\uff1a\u6307\u5411\u4e0d\u80fd\u88ab\u6539\u53d8\uff0cReact \u7ec4\u4ef6\u4f20\u503c\u65f6\u5e38\u5229\u7528\u8fd9\u4e00\u70b9\u3002<\/p>\n
\u7ee7\u627f extends<\/h3>\n
\u76f8\u6bd4 ES5\uff0cES6 \u7ee7\u627f\u7b80\u5355\u5f88\u591a\uff1a<\/p>\n
class Person {\n  constructor(name, age) {\n    this.name = name;\n    this.age = age;\n  }\n\n  getName() {\n    return this.name\n  }\n}\n\n\/\/ Student\u7c7b\u7ee7\u627fPerson\u7c7b\nclass Student extends Person {\n  constructor(name, age, gender, classes) {\n    super(name, age);\n    this.gender = gender;\n    this.classes = classes;\n  }\n\n  getGender() {\n    return this.gender;\n  }\n}<\/code><\/pre>\n
\u4e00\u4e2a extends<\/code> \u5373\u53ef\uff0c\u4e0d\u5fc5\u518d\u7ea0\u7ed3\u6784\u9020\u51fd\u6570\u7ee7\u627f\u548c\u539f\u578b\u7ee7\u627f\u3002\u5b50\u7c7b\u6784\u9020\u51fd\u6570\u91cc\u5fc5\u987b\u8c03\u7528\u4e00\u6b21 super<\/code>\uff0c\u4f5c\u7528\u7b49\u540c\u4e8e ES5 \u91cc\u7528 call\/apply \u7ee7\u627f\u6784\u9020\u51fd\u6570\uff1a<\/p>\n
\/\/ \u6784\u9020\u51fd\u6570\u4e2d\n\/\/ es6 \nsuper(name, age);\n\n\/\/ es5\nPerson.call(this);<\/code><\/pre>\n
super \u4e5f\u53ef\u4ee5\u76f4\u63a5\u8c03\u7236\u7ea7\u539f\u578b\u65b9\u6cd5\uff08\u5982 super.getName\uff09\uff0c\u5b9e\u9645\u91cc\u5f88\u5c11\u8fd9\u6837\u5199\u3002React \u91cc\u5927\u91cf\u7ec4\u4ef6\u7528\u7ee7\u627f\u521b\u5efa\uff1a<\/p>\n
import React, { Component } from 'react';\n\nclass App extends Component {\n\n  defaultProps = {}\n  state = {}\n  componentWillMount() {}\n  componentDidMount() {}\n\n  btnClick = e => {}\n\n  render() {}\n}<\/code><\/pre>\n
\u5206\u6e05\u54ea\u4e9b\u5c5e\u6027\u65b9\u6cd5\u653e\u5728\u6784\u9020\u51fd\u6570\u3001\u54ea\u4e9b\u653e\u5728\u539f\u578b\u4e0a\uff0c\u81ea\u5df1\u5199 React \u7ec4\u4ef6\u4f1a\u6e05\u6670\u5f88\u591a\u3002\u96be\u70b9\u4e0d\u5728\u8fd9\u4e9b\u8bed\u6cd5\u7cd6\uff0c\u800c\u5728 ES5 \u539f\u7406\uff0c\u91cd\u70b9\u8fd8\u662f\u8981\u56de\u5230\u57fa\u7840\u4e0a\u3002<\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u7528 let\/const \u53d6\u4ee3 var\uff0c\u7528\u89e3\u6784\u548c\u5c55\u5f00\u5c11\u5199\u53d6\u503c\u4ee3\u7801\uff1b\u7bad\u5934\u51fd\u6570\u6ca1\u6709\u81ea\u5df1\u7684 this\uff0cclass \u53ea\u662f\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u6cd5\u7cd6\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
ES6 \u65e5\u5e38\u6700\u5e38\u7528\u7684\u4e00\u6279\u8bed\u6cd5\uff0c\u6838\u5fc3\u5c31\u51e0\u4ef6\u4e8b\uff1alet\/const\u3001\u7bad\u5934\u51fd\u6570\u3001\u6a21\u677f\u5b57\u7b26\u4e32\u3001\u89e3\u6784\u3001\u9ed8\u8ba4\u53c2\u6570\u3001\u5c55\u5f00\u8fd0\u7b97 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[109,105],"tags":[150],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2499"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2499"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2499\/revisions"}],"predecessor-version":[{"id":3689,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2499\/revisions\/3689"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}