{"id":1359,"date":"2024-06-02T22:22:01","date_gmt":"2024-06-02T22:22:01","guid":{"rendered":""},"modified":"2024-06-05T03:08:19","modified_gmt":"2024-06-04T19:08:19","slug":"es6-%e7%b3%bb%e5%88%97%e4%b9%8b-babel-%e6%98%af%e5%a6%82%e4%bd%95%e7%bc%96%e8%af%91-class-%e7%9a%84%e4%b8%8a","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1359","title":{"rendered":"ES6 \u7cfb\u5217\u4e4b Babel \u662f\u5982\u4f55\u7f16\u8bd1 Class \u7684(\u4e0a)"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

\u5728\u4e86\u89e3 Babel \u662f\u5982\u4f55\u7f16\u8bd1 class \u524d\uff0c\u6211\u4eec\u5148\u770b\u770b ES6 \u7684 class \u548c ES5 \u7684\u6784\u9020\u51fd\u6570\u662f\u5982\u4f55\u5bf9\u5e94\u7684\u3002\u6bd5\u7adf\uff0cES6 \u7684 class \u53ef\u4ee5\u770b\u4f5c\u4e00\u4e2a\u8bed\u6cd5\u7cd6\uff0c\u5b83\u7684\u7edd\u5927\u90e8\u5206\u529f\u80fd\uff0cES5 \u90fd\u53ef\u4ee5\u505a\u5230\uff0c\u65b0\u7684 class \u5199\u6cd5\u53ea\u662f\u8ba9\u5bf9\u8c61\u539f\u578b\u7684\u5199\u6cd5\u66f4\u52a0\u6e05\u6670\u3001\u66f4\u50cf\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u8bed\u6cd5\u800c\u5df2\u3002<\/p>\n

constructor<\/h2>\n

ES6 \u4e2d\uff1a<\/p>\n

<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    constructor<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n    }<\/span>\n\n    sayHello<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'hello, I am '<\/span> +<\/span> this<\/span>.<\/span>name<\/span>;<\/span>\n    }<\/span>\n}<\/span>\n\nvar<\/span> kevin<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>'Kevin'<\/span>)<\/span>;<\/span>\nkevin<\/span>.<\/span>sayHello<\/span>(<\/span>)<\/span>;<\/span> \/\/ hello, I am Kevin<\/span><\/pre>\n<\/div>\n
\u5bf9\u5e94\u5230 ES5 \u4e2d\u5c31\u662f:<\/p>\n
<\/p>\n
function<\/span> Person<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n    this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n}<\/span>\n\nPerson<\/span>.<\/span>prototype<\/span>.<\/span>sayHello<\/span> =<\/span> function<\/span> (<\/span>)<\/span> {<\/span>\n    return<\/span> 'hello, I am '<\/span> +<\/span> this<\/span>.<\/span>name<\/span>;<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> kevin<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>'Kevin'<\/span>)<\/span>;<\/span>\nkevin<\/span>.<\/span>sayHello<\/span>(<\/span>)<\/span>;<\/span> \/\/ hello, I am Kevin<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u53ef\u4ee5\u770b\u5230 ES5 \u7684\u6784\u9020\u51fd\u6570 Person\uff0c\u5bf9\u5e94 ES6 \u7684 Person \u7c7b\u7684 constructor \u65b9\u6cd5\u3002<\/p>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff1a\u7c7b\u7684\u5185\u90e8\u6240\u6709\u5b9a\u4e49\u7684\u65b9\u6cd5\uff0c\u90fd\u662f\u4e0d\u53ef\u679a\u4e3e\u7684\uff08non-enumerable\uff09<\/strong><\/p>\n
\u4ee5\u4e0a\u9762\u7684\u4f8b\u5b50\u4e3a\u4f8b\uff0c\u5728 ES6 \u4e2d\uff1a<\/p>\n
<\/p>\n
Object<\/span>.<\/span>keys<\/span>(<\/span>Person<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span> \/\/ []<\/span>\nObject<\/span>.<\/span>getOwnPropertyNames<\/span>(<\/span>Person<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span> \/\/ [\"constructor\", \"sayHello\"]<\/span><\/pre>\n<\/div>\n
\u7136\u800c\u5728 ES5 \u4e2d\uff1a<\/p>\n
<\/p>\n
Object<\/span>.<\/span>keys<\/span>(<\/span>Person<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span> \/\/ ['sayHello']<\/span>\nObject<\/span>.<\/span>getOwnPropertyNames<\/span>(<\/span>Person<\/span>.<\/span>prototype<\/span>)<\/span>;<\/span> \/\/ [\"constructor\", \"sayHello\"]<\/span><\/pre>\n<\/div>\n
\u5b9e\u4f8b\u5c5e\u6027<\/h2>\n
\u4ee5\u524d\uff0c\u6211\u4eec\u5b9a\u4e49\u5b9e\u4f8b\u5c5e\u6027\uff0c\u53ea\u80fd\u5199\u5728\u7c7b\u7684 constructor \u65b9\u6cd5\u91cc\u9762\u3002\u6bd4\u5982\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    constructor<\/span>(<\/span>)<\/span> {<\/span>\n        this<\/span>.<\/span>state<\/span> =<\/span> {<\/span>\n            count<\/span>: 0<\/span>\n        }<\/span>;<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u7136\u800c\u73b0\u5728\u6709\u4e00\u4e2a\u63d0\u6848\uff0c\u5bf9\u5b9e\u4f8b\u5c5e\u6027\u548c\u9759\u6001\u5c5e\u6027\u90fd\u89c4\u5b9a\u4e86\u65b0\u7684\u5199\u6cd5\uff0c\u800c\u4e14 Babel \u5df2\u7ecf\u652f\u6301\u3002\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u5199\u6210\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    state<\/span> =<\/span> {<\/span>\n        count<\/span>: 0<\/span>\n    }<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u5bf9\u5e94\u5230 ES5 \u90fd\u662f\uff1a<\/p>\n
<\/p>\n
function<\/span> Person<\/span>(<\/span>)<\/span> {<\/span>\n    this<\/span>.<\/span>state<\/span> =<\/span> {<\/span>\n        count<\/span>: 0<\/span>\n    }<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u9759\u6001\u65b9\u6cd5<\/h2>\n
\u6240\u6709\u5728\u7c7b\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\uff0c\u90fd\u4f1a\u88ab\u5b9e\u4f8b\u7ee7\u627f\u3002\u5982\u679c\u5728\u4e00\u4e2a\u65b9\u6cd5\u524d\uff0c\u52a0\u4e0a static \u5173\u952e\u5b57\uff0c\u5c31\u8868\u793a\u8be5\u65b9\u6cd5\u4e0d\u4f1a\u88ab\u5b9e\u4f8b\u7ee7\u627f\uff0c\u800c\u662f\u76f4\u63a5\u901a\u8fc7\u7c7b\u6765\u8c03\u7528\uff0c\u8fd9\u5c31\u79f0\u4e3a\u201c\u9759\u6001\u65b9\u6cd5\u201d\u3002<\/p>\n
ES6 \u4e2d\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    static<\/span> sayHello<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'hello'<\/span>;<\/span>\n    }<\/span>\n}<\/span>\n\nPerson<\/span>.<\/span>sayHello<\/span>(<\/span>)<\/span> \/\/ 'hello'<\/span>\n\nvar<\/span> kevin<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>)<\/span>;<\/span>\nkevin<\/span>.<\/span>sayHello<\/span>(<\/span>)<\/span>;<\/span> \/\/ TypeError: kevin.sayHello is not a function<\/span><\/pre>\n<\/div>\n
\u5bf9\u5e94 ES5\uff1a<\/p>\n
<\/p>\n
function<\/span> Person<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\n\nPerson<\/span>.<\/span>sayHello<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n    return<\/span> 'hello'<\/span>;<\/span>\n}<\/span>;<\/span>\n\nPerson<\/span>.<\/span>sayHello<\/span>(<\/span>)<\/span>;<\/span> \/\/ 'hello'<\/span>\n\nvar<\/span> kevin<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>)<\/span>;<\/span>\nkevin<\/span>.<\/span>sayHello<\/span>(<\/span>)<\/span>;<\/span> \/\/ TypeError: kevin.sayHello is not a function<\/span><\/pre>\n<\/div>\n
\u9759\u6001\u5c5e\u6027<\/h2>\n
\u9759\u6001\u5c5e\u6027\u6307\u7684\u662f Class \u672c\u8eab\u7684\u5c5e\u6027\uff0c\u5373 Class.propName\uff0c\u800c\u4e0d\u662f\u5b9a\u4e49\u5728\u5b9e\u4f8b\u5bf9\u8c61\uff08this\uff09\u4e0a\u7684\u5c5e\u6027\u3002\u4ee5\u524d\uff0c\u6211\u4eec\u6dfb\u52a0\u9759\u6001\u5c5e\u6027\u53ea\u53ef\u4ee5\u8fd9\u6837\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>}<\/span>\n\nPerson<\/span>.<\/span>name<\/span> =<\/span> 'kevin'<\/span>;<\/span><\/pre>\n<\/div>\n
\u56e0\u4e3a\u4e0a\u9762\u63d0\u5230\u7684\u63d0\u6848\uff0c\u73b0\u5728\u53ef\u4ee5\u5199\u6210\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n  static<\/span> name<\/span> =<\/span> 'kevin'<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u5bf9\u5e94\u5230 ES5 \u90fd\u662f\uff1a<\/p>\n
<\/p>\n
function<\/span> Person<\/span>(<\/span>)<\/span> {<\/span>}<\/span>;<\/span>\n\nPerson<\/span>.<\/span>name<\/span> =<\/span> 'kevin'<\/span>;<\/span><\/pre>\n<\/div>\n
new \u8c03\u7528<\/h2>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff1a\u7c7b\u5fc5\u987b\u4f7f\u7528 new \u8c03\u7528\uff0c\u5426\u5219\u4f1a\u62a5\u9519\u3002\u8fd9\u662f\u5b83\u8ddf\u666e\u901a\u6784\u9020\u51fd\u6570\u7684\u4e00\u4e2a\u4e3b\u8981\u533a\u522b\uff0c\u540e\u8005\u4e0d\u7528 new \u4e5f\u53ef\u4ee5\u6267\u884c\u3002<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>}<\/span>\n\nPerson<\/span>(<\/span>)<\/span>;<\/span> \/\/ TypeError: Class constructor Foo cannot be invoked without 'new'<\/span><\/pre>\n<\/div>\n
getter \u548c setter<\/h2>\n
\u4e0e ES5 \u4e00\u6837\uff0c\u5728\u201c\u7c7b\u201d\u7684\u5185\u90e8\u53ef\u4ee5\u4f7f\u7528 get \u548c set \u5173\u952e\u5b57\uff0c\u5bf9\u67d0\u4e2a\u5c5e\u6027\u8bbe\u7f6e\u5b58\u503c\u51fd\u6570\u548c\u53d6\u503c\u51fd\u6570\uff0c\u62e6\u622a\u8be5\u5c5e\u6027\u7684\u5b58\u53d6\u884c\u4e3a\u3002<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    get<\/span> name<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'kevin'<\/span>;<\/span>\n    }<\/span>\n    set<\/span> name<\/span>(<\/span>newName<\/span>)<\/span> {<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>'new name \u4e3a\uff1a'<\/span> +<\/span> newName<\/span>)<\/span>\n    }<\/span>\n}<\/span>\n\nlet<\/span> person<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>)<\/span>;<\/span>\n\nperson<\/span>.<\/span>name<\/span> =<\/span> 'daisy'<\/span>;<\/span>\n\/\/ new name \u4e3a\uff1adaisy<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>person<\/span>.<\/span>name<\/span>)<\/span>;<\/span>\n\/\/ kevin<\/span><\/pre>\n<\/div>\n
\u5bf9\u5e94\u5230 ES5 \u4e2d\uff1a<\/p>\n
<\/p>\n
function<\/span> Person<\/span>(<\/span>name<\/span>)<\/span> {<\/span>}<\/span>\n\nPerson<\/span>.<\/span>prototype<\/span> =<\/span> {<\/span>\n    get<\/span> name<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'kevin'<\/span>;<\/span>\n    }<\/span>,<\/span>\n    set<\/span> name<\/span>(<\/span>newName<\/span>)<\/span> {<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>'new name \u4e3a\uff1a'<\/span> +<\/span> newName<\/span>)<\/span>\n    }<\/span>\n}<\/span>\n\nlet<\/span> person<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>)<\/span>;<\/span>\n\nperson<\/span>.<\/span>name<\/span> =<\/span> 'daisy'<\/span>;<\/span>\n\/\/ new name \u4e3a\uff1adaisy<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>person<\/span>.<\/span>name<\/span>)<\/span>;<\/span>\n\/\/ kevin<\/span><\/pre>\n<\/div>\n
Babel \u7f16\u8bd1<\/h2>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u4e86\u6709\u5173\u201c\u7c7b\u201d\u7684\u65b9\u6cd5\u4e2d\uff0cES6 \u4e0e ES5 \u662f\u5982\u4f55\u5bf9\u5e94\u7684\uff0c\u5b9e\u9645\u4e0a Babel \u5728\u7f16\u8bd1\u65f6\u5e76\u4e0d\u4f1a\u76f4\u63a5\u5c31\u8f6c\u6210\u8fd9\u79cd\u5f62\u5f0f\uff0cBabel \u4f1a\u81ea\u5df1\u751f\u6210\u4e00\u4e9b\u8f85\u52a9\u51fd\u6570\uff0c\u5e2e\u52a9\u5b9e\u73b0 ES6 \u7684\u7279\u6027\u3002<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u5728 Babel \u5b98\u7f51\u7684 Try it out <\/a>\u9875\u9762\u67e5\u770b ES6 \u7684\u4ee3\u7801\u7f16\u8bd1\u6210\u4ec0\u4e48\u6837\u5b50\u3002<\/p>\n
\u7f16\u8bd1\uff08\u4e00\uff09<\/h3>\n
ES6 \u4ee3\u7801\u4e3a\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    constructor<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
Babel \u7f16\u8bd1\u4e3a\uff1a<\/p>\n
<\/p>\n
\"use strict\"<\/span>;<\/span>\n\nfunction<\/span> _classCallCheck<\/span>(<\/span>instance<\/span>,<\/span> Constructor<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>!<\/span>(<\/span>instance<\/span> instanceof<\/span> Constructor<\/span>)<\/span>)<\/span> {<\/span>\n        throw<\/span> new<\/span> TypeError<\/span>(<\/span>\"Cannot call a class as a function\"<\/span>)<\/span>;<\/span>\n    }<\/span>\n}<\/span>\n\nvar<\/span> Person<\/span> =<\/span> function<\/span> Person<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n    _classCallCheck<\/span>(<\/span>this<\/span>,<\/span> Person<\/span>)<\/span>;<\/span>\n\n    this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
_classCallCheck \u7684\u4f5c\u7528\u662f\u68c0\u67e5 Person \u662f\u5426\u662f\u901a\u8fc7 new \u7684\u65b9\u5f0f\u8c03\u7528\uff0c\u5728\u4e0a\u9762\uff0c\u6211\u4eec\u4e5f\u8bf4\u8fc7\uff0c\u7c7b\u5fc5\u987b\u4f7f\u7528 new \u8c03\u7528\uff0c\u5426\u5219\u4f1a\u62a5\u9519\u3002<\/p>\n
\u5f53\u6211\u4eec\u4f7f\u7528 var person = Person()<\/code> \u7684\u5f62\u5f0f\u8c03\u7528\u7684\u65f6\u5019\uff0cthis \u6307\u5411 window\uff0c\u6240\u4ee5 instance instanceof Constructor<\/code> \u5c31\u4f1a\u4e3a false\uff0c\u4e0e ES6 \u7684\u8981\u6c42\u4e00\u81f4\u3002<\/p>\n
\u7f16\u8bd1\uff08\u4e8c\uff09<\/h3>\n
ES6 \u4ee3\u7801\u4e3a\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    \/\/ \u5b9e\u4f8b\u5c5e\u6027<\/span>\n    foo<\/span> =<\/span> 'foo'<\/span>;<\/span>\n    \/\/ \u9759\u6001\u5c5e\u6027<\/span>\n    static<\/span> bar<\/span> =<\/span> 'bar'<\/span>;<\/span>\n\n    constructor<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
Babel \u7f16\u8bd1\u4e3a\uff1a<\/p>\n
<\/p>\n
'use strict'<\/span>;<\/span>\n\nfunction<\/span> _classCallCheck<\/span>(<\/span>instance<\/span>,<\/span> Constructor<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>!<\/span>(<\/span>instance<\/span> instanceof<\/span> Constructor<\/span>)<\/span>)<\/span> {<\/span>\n        throw<\/span> new<\/span> TypeError<\/span>(<\/span>\"Cannot call a class as a function\"<\/span>)<\/span>;<\/span>\n    }<\/span>\n}<\/span>\n\nvar<\/span> Person<\/span> =<\/span> function<\/span> Person<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n    _classCallCheck<\/span>(<\/span>this<\/span>,<\/span> Person<\/span>)<\/span>;<\/span>\n\n    this<\/span>.<\/span>foo<\/span> =<\/span> 'foo'<\/span>;<\/span>\n\n    this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n}<\/span>;<\/span>\n\nPerson<\/span>.<\/span>bar<\/span> =<\/span> 'bar'<\/span>;<\/span><\/pre>\n<\/div>\n
\u7f16\u8bd1\uff08\u4e09\uff09<\/h3>\n
ES6 \u4ee3\u7801\u4e3a\uff1a<\/p>\n
<\/p>\n
class<\/span> Person<\/span> {<\/span>\n    constructor<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n    }<\/span>\n\n    sayHello<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'hello, I am '<\/span> +<\/span> this<\/span>.<\/span>name<\/span>;<\/span>\n    }<\/span>\n\n    static<\/span> onlySayHello<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'hello'<\/span>\n    }<\/span>\n\n    get<\/span> name<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'kevin'<\/span>;<\/span>\n    }<\/span>\n\n    set<\/span> name<\/span>(<\/span>newName<\/span>)<\/span> {<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>'new name \u4e3a\uff1a'<\/span> +<\/span> newName<\/span>)<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u5bf9\u5e94\u5230 ES5 \u7684\u4ee3\u7801\u5e94\u8be5\u662f\uff1a<\/p>\n
<\/p>\n
function<\/span> Person<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n    this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n}<\/span>\n\nPerson<\/span>.<\/span>prototype<\/span> =<\/span>  {<\/span>\n    sayHello<\/span>: function<\/span> (<\/span>)<\/span> {<\/span>\n        return<\/span> 'hello, I am '<\/span> +<\/span> this<\/span>.<\/span>name<\/span>;<\/span>\n    }<\/span>,<\/span>\n    get<\/span> name<\/span>(<\/span>)<\/span> {<\/span>\n        return<\/span> 'kevin'<\/span>;<\/span>\n    }<\/span>,<\/span>\n    set<\/span> name<\/span>(<\/span>newName<\/span>)<\/span> {<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>'new name \u4e3a\uff1a'<\/span> +<\/span> newName<\/span>)<\/span>\n    }<\/span>\n}<\/span>\n\nPerson<\/span>.<\/span>onlySayHello<\/span> =<\/span> function<\/span> (<\/span>)<\/span> {<\/span>\n    return<\/span> 'hello'<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
Babel \u7f16\u8bd1\u540e\u4e3a\uff1a<\/p>\n
<\/p>\n
'use strict'<\/span>;<\/span>\n\nvar<\/span> _createClass<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n    function<\/span> defineProperties<\/span>(<\/span>target<\/span>,<\/span> props<\/span>)<\/span> {<\/span>\n        for<\/span> (<\/span>var<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> props<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n            var<\/span> descriptor<\/span> =<\/span> props<\/span>[<\/span>i<\/span>]<\/span>;<\/span>\n            descriptor<\/span>.<\/span>enumerable<\/span> =<\/span> descriptor<\/span>.<\/span>enumerable<\/span> ||<\/span> false<\/span>;<\/span>\n            descriptor<\/span>.<\/span>configurable<\/span> =<\/span> true<\/span>;<\/span>\n            if<\/span> (<\/span>\"value\"<\/span> in<\/span> descriptor<\/span>)<\/span> descriptor<\/span>.<\/span>writable<\/span> =<\/span> true<\/span>;<\/span>\n            Object<\/span>.<\/span>defineProperty<\/span>(<\/span>target<\/span>,<\/span> descriptor<\/span>.<\/span>key<\/span>,<\/span> descriptor<\/span>)<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n    return<\/span> function<\/span>(<\/span>Constructor<\/span>,<\/span> protoProps<\/span>,<\/span> staticProps<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>protoProps<\/span>)<\/span> defineProperties<\/span>(<\/span>Constructor<\/span>.<\/span>prototype<\/span>,<\/span> protoProps<\/span>)<\/span>;<\/span>\n        if<\/span> (<\/span>staticProps<\/span>)<\/span> defineProperties<\/span>(<\/span>Constructor<\/span>,<\/span> staticProps<\/span>)<\/span>;<\/span>\n        return<\/span> Constructor<\/span>;<\/span>\n    }<\/span>;<\/span>\n}<\/span>(<\/span>)<\/span>;<\/span>\n\nfunction<\/span> _classCallCheck<\/span>(<\/span>instance<\/span>,<\/span> Constructor<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>!<\/span>(<\/span>instance<\/span> instanceof<\/span> Constructor<\/span>)<\/span>)<\/span> {<\/span>\n        throw<\/span> new<\/span> TypeError<\/span>(<\/span>\"Cannot call a class as a function\"<\/span>)<\/span>;<\/span>\n    }<\/span>\n}<\/span>\n\nvar<\/span> Person<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n    function<\/span> Person<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n        _classCallCheck<\/span>(<\/span>this<\/span>,<\/span> Person<\/span>)<\/span>;<\/span>\n\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n    }<\/span>\n\n    _createClass<\/span>(<\/span>Person<\/span>,<\/span> [<\/span>{<\/span>\n        key<\/span>: 'sayHello'<\/span>,<\/span>\n        value<\/span>: function<\/span> sayHello<\/span>(<\/span>)<\/span> {<\/span>\n            return<\/span> 'hello, I am '<\/span> +<\/span> this<\/span>.<\/span>name<\/span>;<\/span>\n        }<\/span>\n    }<\/span>,<\/span> {<\/span>\n        key<\/span>: 'name'<\/span>,<\/span>\n        get<\/span>: function<\/span> get<\/span>(<\/span>)<\/span> {<\/span>\n            return<\/span> 'kevin'<\/span>;<\/span>\n        }<\/span>,<\/span>\n        set<\/span>: function<\/span> set<\/span>(<\/span>newName<\/span>)<\/span> {<\/span>\n            console<\/span>.<\/span>log<\/span>(<\/span>'new name \u4e3a\uff1a'<\/span> +<\/span> newName<\/span>)<\/span>;<\/span>\n        }<\/span>\n    }<\/span>]<\/span>,<\/span> [<\/span>{<\/span>\n        key<\/span>: 'onlySayHello'<\/span>,<\/span>\n        value<\/span>: function<\/span> onlySayHello<\/span>(<\/span>)<\/span> {<\/span>\n            return<\/span> 'hello'<\/span>;<\/span>\n        }<\/span>\n    }<\/span>]<\/span>)<\/span>;<\/span>\n\n    return<\/span> Person<\/span>;<\/span>\n}<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u53ef\u4ee5\u770b\u5230 Babel \u751f\u6210\u4e86\u4e00\u4e2a _createClass \u8f85\u52a9\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4f20\u5165\u4e09\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u662f\u6784\u9020\u51fd\u6570\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u4e5f\u5c31\u662f Person\uff0c\u7b2c\u4e8c\u4e2a\u662f\u8981\u6dfb\u52a0\u5230\u539f\u578b\u4e0a\u7684\u51fd\u6570\u6570\u7ec4\uff0c\u7b2c\u4e09\u4e2a\u662f\u8981\u6dfb\u52a0\u5230\u6784\u9020\u51fd\u6570\u672c\u8eab\u7684\u51fd\u6570\u6570\u7ec4\uff0c\u4e5f\u5c31\u662f\u6240\u6709\u6dfb\u52a0 static \u5173\u952e\u5b57\u7684\u51fd\u6570\u3002\u8be5\u51fd\u6570\u7684\u4f5c\u7528\u5c31\u662f\u5c06\u51fd\u6570\u6570\u7ec4\u4e2d\u7684\u65b9\u6cd5\u6dfb\u52a0\u5230\u6784\u9020\u51fd\u6570\u6216\u8005\u6784\u9020\u51fd\u6570\u7684\u539f\u578b\u4e2d\uff0c\u6700\u540e\u8fd4\u56de\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u3002<\/p>\n
\u5728\u5176\u4e2d\uff0c\u53c8\u751f\u6210\u4e86\u4e00\u4e2a defineProperties \u8f85\u52a9\u51fd\u6570\uff0c\u4f7f\u7528 Object.defineProperty \u65b9\u6cd5\u6dfb\u52a0\u5c5e\u6027\u3002<\/p>\n
\u9ed8\u8ba4 enumerable \u4e3a false\uff0cconfigurable \u4e3a true\uff0c\u8fd9\u4e2a\u5728\u4e0a\u9762\u4e5f\u6709\u5f3a\u8c03\u8fc7\uff0c\u662f\u4e3a\u4e86\u9632\u6b62 Object.keys() \u4e4b\u7c7b\u7684\u65b9\u6cd5\u904d\u5386\u5230\u3002\u7136\u540e\u901a\u8fc7\u5224\u65ad value \u662f\u5426\u5b58\u5728\uff0c\u6765\u5224\u65ad\u662f\u5426\u662f getter \u548c setter\u3002\u5982\u679c\u5b58\u5728 value\uff0c\u5c31\u4e3a descriptor \u6dfb\u52a0 value \u548c writable \u5c5e\u6027\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5c31\u76f4\u63a5\u4f7f\u7528 get \u548c set \u5c5e\u6027\u3002<\/p>\n
\u5199\u5728\u540e\u9762<\/h2>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u5df2\u7ecf\u4e86\u89e3\u4e86 Babel \u662f\u5982\u4f55\u7f16\u8bd1\u4e00\u4e2a Class \u7684\uff0c\u7136\u800c\uff0cClass \u8fd8\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u7279\u6027\u5c31\u662f\u7ee7\u627f\uff0cClass \u5982\u4f55\u7ee7\u627f\uff0cBabel \u53c8\u8be5\u5982\u4f55\u7f16\u8bd1\uff0c\u6b22\u8fce\u671f\u5f85\u4e0b\u4e00\u7bc7\u300a ES6 \u7cfb\u5217\u4e4b Babel \u662f\u5982\u4f55\u7f16\u8bd1 Class \u7684(\u4e0b)\u300b<\/p>\n
ES6 \u7cfb\u5217<\/h2>\n
ES6 \u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1ahttps:\/\/github.com\/mqyqingfeng\/Blog<\/a><\/p>\n
ES6 \u7cfb\u5217\u9884\u8ba1\u5199\u4e8c\u5341\u7bc7\u5de6\u53f3\uff0c\u65e8\u5728\u52a0\u6df1 ES6 \u90e8\u5206\u77e5\u8bc6\u70b9\u7684\u7406\u89e3\uff0c\u91cd\u70b9\u8bb2\u89e3\u5757\u7ea7\u4f5c\u7528\u57df\u3001\u6807\u7b7e\u6a21\u677f\u3001\u7bad\u5934\u51fd\u6570\u3001Symbol\u3001Set\u3001Map \u4ee5\u53ca Promise \u7684\u6a21\u62df\u5b9e\u73b0\u3001\u6a21\u5757\u52a0\u8f7d\u65b9\u6848\u3001\u5f02\u6b65\u5904\u7406\u7b49\u5185\u5bb9\u3002<\/p>\n<\/td>\n
\u6587\u7ae0\u8f6c\u8f7d\u81eahttps:\/\/github.com\/mqyqingfeng\/Blog\/issues\/105<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00 \u5728\u4e86\u89e3 Babel \u662f\u5982\u4f55\u7f16\u8bd1 class \u524d\uff0c\u6211\u4eec\u5148\u770b\u770b ES6 \u7684 class \u548c ES5 \u7684\u6784\u9020\u51fd\u6570\u662f\u5982\u4f55\u5bf9\u5e94\u7684\u3002\u6bd5\u7adf\uff0cES6 \u7684 class \u53ef\u4ee5…<\/p>\n
 Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1359","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1359"}],"collection":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1359"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1359\/revisions"}],"predecessor-version":[{"id":1454,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1359\/revisions\/1454"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1359"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}