{"id":3259,"date":"2021-06-07T20:02:38","date_gmt":"2021-06-07T12:02:38","guid":{"rendered":"http:\/\/www.yuguoxy.com\/geekhome\/?p=3259"},"modified":"2021-06-07T20:03:46","modified_gmt":"2021-06-07T12:03:46","slug":"javascript-%e5%8f%8d%e5%b0%84%e6%9c%ba%e5%88%b6%e5%8f%8a-reflect-%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=3259","title":{"rendered":"JavaScript \u53cd\u5c04\u673a\u5236\u53ca Reflect \u8be6\u89e3"},"content":{"rendered":"<h2><strong>\u4e00\u3001\u4ec0\u4e48\u662f\u53cd\u5c04\u673a\u5236<\/strong><\/h2>\n<p>\u53cd\u5c04\u673a\u5236\u662f\u5728\u7f16\u8bd1\u9636\u6bb5\u4e0d\u77e5\u9053\u662f\u54ea\u4e2a\u7c7b\u88ab\u52a0\u8f7d\uff0c\u800c\u662f\u5728\u8fd0\u884c\u7684\u65f6\u5019\u624d\u52a0\u8f7d\u3001\u6267\u884c\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u53cd\u5c04\u673a\u5236\u6307\u7684\u662f\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6\u80fd\u591f\u83b7\u53d6\u81ea\u8eab\u7684\u4fe1\u606f\u3002js \u4e2d\u7684 apply \u5c31\u662f\u53cd\u5c04\u673a\u5236\u3002<\/p>\n<h2><strong>\u4e8c\u3001Reflect<\/strong><\/h2>\n<h3><strong>1\u3001Reflect \u5b9a\u4e49<\/strong><\/h3>\n<p>Reflect \u662f\u4e00\u4e2a\u5185\u5efa\u7684\u5bf9\u8c61\uff0c\u7528\u6765\u63d0\u4f9b\u65b9\u6cd5\u53bb\u62e6\u622a JavaScript \u7684\u64cd\u4f5c\u3002<br \/>\nReflect \u4e0d\u662f\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61\uff0c\u6240\u4ee5\u5b83\u662f\u4e0d\u53ef\u6784\u9020\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u5b83\u4e0d\u662f\u4e00\u4e2a\u6784\u9020\u5668\uff0c\u4e0d\u80fd\u901a\u8fc7 new \u64cd\u4f5c\u7b26\u53bb\u65b0\u5efa\u6216\u8005\u5c06\u5176\u4f5c\u4e3a\u4e00\u4e2a\u51fd\u6570\u53bb\u8c03\u7528 Reflect \u5bf9\u8c61\u3002<\/p>\n<p>Reflect \u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u90fd\u662f\u9759\u6001\u7684\u3002<\/p>\n<p>Reflect \u5185\u90e8\u5c01\u88c5\u4e86\u4e00\u7cfb\u5217\u5bf9\u5bf9\u8c61\u7684\u5e95\u5c42\u64cd\u4f5c\u3002<br \/>\nReflect \u6210\u5458\u65b9\u6cd5\u5c31\u662f Proxy \u5904\u7406\u5bf9\u8c61\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002<\/p>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const proxy = new Proxy(obj, {\r\n  get(target, property) {\r\n    \/\/ \u5982\u679c\u6ca1\u6709\u5b9a\u4e49 get \u65b9\u6cd5\uff0c\u90a3\u4e48\u9ed8\u8ba4\u8fd4\u56de\u7684\u5c31\u662f Reflect \u7684 get \u65b9\u6cd5\r\n    return Reflect.get(target, property)\r\n  }\r\n})\r\n<\/code><\/pre>\n<h3><strong>2\u3001Reflect API \u6c47\u603b<\/strong><\/h3>\n<p>Reflect \u63d0\u4f9b\u4e86\u4e00\u5957\u7528\u4e8e\u64cd\u4f5c\u5bf9\u8c61\u7684 API\uff0c\u6211\u4eec\u4e4b\u524d\u64cd\u4f5c\u5bf9\u8c61\u53ef\u4ee5\u7528 Object \u4e0a\u9762\u7684\u4e00\u4e9b\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u7528 in\u3001delete \u8fd9\u79cd\u64cd\u4f5c\u7b26\uff0c\u4f7f\u7528 Reflect \u5c31\u7edf\u4e00\u4e86\u64cd\u4f5c\u65b9\u5f0f<\/p>\n<p><a href=\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2021\/06\/20210607200328.png\" rel=\"fancybox\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-3263\" src=\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2021\/06\/20210607200328.png\" alt=\"20210607200328\" width=\"990\" height=\"592\" \/><\/a><\/p>\n<h3><strong>3\u3001.apply()<\/strong><\/h3>\n<h3>Reflect.apply(target, thisArgument, argumentsList)<\/h3>\n<ul>\n<li>target\uff1a\u76ee\u6807\u51fd\u6570\uff08\u5fc5\u9009\uff09<\/li>\n<li>thisArgument\uff1atarget \u51fd\u6570\u8c03\u7528\u65f6\u7ed1\u5b9a\u7684 this \u5bf9\u8c61\uff08\u53ef\u9009\uff09<\/li>\n<li>argumentsList\uff1atarget \u51fd\u6570\u8c03\u7528\u65f6\u4f20\u5165\u7684\u5b9e\u53c2\u5217\u8868\uff0c\u8be5\u53c2\u6570\u5e94\u8be5\u662f\u4e00\u4e2a\u7c7b\u6570\u7ec4\u7684\u5bf9\u8c61\uff08\u53ef\u9009\uff09<\/li>\n<\/ul>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<p>\u5148\u6307\u5b9a\u65b9\u6cd5\uff0c\u518d\u53bb\u8c03\u7528 apply<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">Math.floor.apply(null, [1.72])  \/\/ 1\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<p>\u5148\u4f20\u9012 apply\uff0c\u518d\u6307\u5b9a\u662f\u54ea\u4e2a\u65b9\u6cd5<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">Reflect.apply(Math.floor, null, [1.72])  \/\/ 1\r\n<\/code><\/pre>\n<p>\u9759\u6001\u626b\u63cf\u65f6 Math.floor \u662f\u6ca1\u6709\u88ab\u6267\u884c\uff0c\u7b49\u5230\u8fd0\u884c\u65f6\u518d\u52a8\u6001\u7684\u5c06 Math.floor \u4f5c\u4e3a\u53c2\u6570\u4f20\u8fdb\u6765\u7684<\/p>\n<h4>\u2462 \u5b9e\u9645\u5e94\u7528<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">\/\/ ES5 \u7528\u6cd5\r\nlet price = 101.5\r\nif (price &gt; 100) {\r\n  price = Math.floor.apply(null, [price])\r\n} else {\r\n  price = Math.ceil.apply(null, [price])\r\n}\r\n\r\nprice  \/\/ 101\r\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">\/\/ ES6 \u7528\u6cd5\r\nlet price = 101.5\r\n\r\nReflect.apply(price &gt; 100 ? Math.floor : Math.ceil, null, [price])  \/\/ 101\r\n<\/code><\/pre>\n<h3><strong>4\u3001.construct()<\/strong><\/h3>\n<p>\u4f7f\u7528\u53cd\u5c04\u7684\u65b9\u5f0f\u53bb\u5b9e\u73b0\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7c7b\u4f3c\u4e8e new target(\u2026args)<br \/>\nReflect.construct(target, argumentsList[, newTarget])<\/p>\n<ul>\n<li>target\uff1a\u88ab\u8fd0\u884c\u7684\u76ee\u6807\u51fd\u6570\uff08\u5fc5\u9009\uff09<\/li>\n<li>argumentsList\uff1a\u8c03\u7528\u6784\u9020\u51fd\u6570\u7684\u6570\u7ec4\u6216\u8005\u4f2a\u6570\u7ec4\uff08\u53ef\u9009\uff09<\/li>\n<li>newTarget\uff1a\u8be5\u53c2\u6570\u4e3a\u6784\u9020\u51fd\u6570\uff0c \u53c2\u8003 new.target \u64cd\u4f5c\u7b26\uff0c\u5982\u679c\u6ca1\u6709 newTarget \u53c2\u6570\uff0c \u9ed8\u8ba4\u548c target \u4e00\u6837\uff08\u53ef\u9009\uff09<\/li>\n<\/ul>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">let a = new Date()\r\n\r\na.getTime()  \/\/ 1632632744483\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">let b = Reflect.construct(Date, [])\r\nb.getTime()  \/\/ 1632632744484\r\n<\/code><\/pre>\n<h3><strong>5\u3001.defineProperty()<\/strong><\/h3>\n<p>\u9759\u6001\u65b9\u6cd5 Reflect.defineProperty() \u57fa\u672c\u7b49\u540c\u4e8e Object.defineProperty() \u65b9\u6cd5<br \/>\nReflect.defineProperty(target, propertyKey, attributes)<\/p>\n<ul>\n<li>target\uff1a\u76ee\u6807\u5bf9\u8c61\uff08\u5fc5\u9009\uff09<\/li>\n<li>propertyKey\uff1a\u8981\u5b9a\u4e49\u6216\u4fee\u6539\u7684\u5c5e\u6027\u7684\u540d\u79f0\uff08\u53ef\u9009\uff09<\/li>\n<li>attributes\uff1a\u8981\u5b9a\u4e49\u6216\u4fee\u6539\u7684\u5c5e\u6027\u7684\u63cf\u8ff0\uff08\u53ef\u9009\uff09<\/li>\n<\/ul>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const student = {}\r\nconst r = Object.defineProperty(student, 'name', { value: 'Mike' })\r\n\r\nstudent  \/\/ {name: \"Mike\"}\r\nr  \/\/ {name: \"Mike\"}\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const student = {}\r\nconst r = Reflect.defineProperty(student, 'name', { value: 'Mike' })\r\n\r\nstudent  \/\/ {name: \"Mike\"}\r\nr  \/\/ true\r\n<\/code><\/pre>\n<p>\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u6548\u679c\u4e0a\u6765\u770b\u662f\u4e00\u6478\u4e00\u6837\u7684\uff0c\u90fd\u53ef\u4ee5\u6539\u53d8\u4e00\u4e2a\u5bf9\u8c61\u7684\u503c<br \/>\n\u533a\u522b\u5728\u4e8e\u8fd4\u56de\u503c\u4e0d\u540c\uff1aObject\u662f\u8fd4\u56de\u8fd9\u4e2a\u503c\uff0cReflect\u662f\u8fd4\u56detrue<\/p>\n<p><strong>*PS: \u5728 W3C \u4e2d\uff0c\u4ee5\u540e\u6240\u6709\u7684 Object \u4e0a\u9762\u7684\u65b9\u6cd5\uff0c\u90fd\u4f1a\u6162\u6162\u8fc1\u79fb\u5230 Reflect \u5bf9\u8c61\uff0c\u53ef\u80fd\u4ee5\u540e\u4f1a\u5728 Object \u4e0a\u9762\u79fb\u9664\u8fd9\u4e9b\u65b9\u6cd5*<\/strong><\/p>\n<h3><strong>6\u3001.deleteProperty()<\/strong><\/h3>\n<p>Reflect.deleteProperty \u5141\u8bb8\u4f60\u5220\u9664\u4e00\u4e2a\u5bf9\u8c61\u4e0a\u7684\u5c5e\u6027\uff0c\u8fd4\u56de\u4e00\u4e2a Boolean \u503c\u8868\u793a\u8be5\u5c5e\u6027\u662f\u5426\u88ab\u6210\u529f\u5220\u9664\uff0c\u5b83\u51e0\u4e4e\u4e0e\u975e\u4e25\u683c\u7684 delete operator \u76f8\u540c<br \/>\nReflect.deleteProperty(target, propertyKey)<\/p>\n<ul>\n<li>target\uff1a\u5220\u9664\u5c5e\u6027\u7684\u76ee\u6807\u5bf9\u8c61<\/li>\n<li>propertyKey\uff1a\u5c06\u88ab\u5220\u9664\u7684\u5c5e\u6027\u7684\u540d\u79f0<\/li>\n<\/ul>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }const a = delete obj.x\r\nobj  \/\/ {y:2}a  \/\/true\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nconst a = Reflect.deleteProperty(obj, 'x')\r\nobj  \/\/ {y:2}a  \/\/true\r\n<\/code><\/pre>\n<h3><strong>7\u3001.get()<\/strong><\/h3>\n<p>Reflect.get() \u65b9\u6cd5\u7684\u5de5\u4f5c\u65b9\u5f0f\uff0c\u5c31\u50cf\u4ece object (target[propertyKey]) \u4e2d\u83b7\u53d6\u5c5e\u6027\uff0c\u4f46\u5b83\u662f\u4f5c\u4e3a\u4e00\u4e2a\u51fd\u6570\u6267\u884c\u7684<br \/>\nReflect.get(target, propertyKey[, receiver])<\/p>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nobj.x  \/\/1obj['x']  \/\/1\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nReflect.get(obj, 'x')  \/\/ 1\r\nReflect.get(['a', 'b', 'c'], 1)  \/\/ b\r\n<\/code><\/pre>\n<h3><strong>8\u3001.getOwnPropertyDescriptor()<\/strong><\/h3>\n<p>\u9759\u6001\u65b9\u6cd5 Reflect.getOwnPropertyDescriptor() \u4e0e Object.getOwnPropertyDescriptor() \u65b9\u6cd5\u76f8\u4f3c<br \/>\n\u5982\u679c\u5728\u5bf9\u8c61\u4e2d\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u7ed9\u5b9a\u7684\u5c5e\u6027\u7684\u5c5e\u6027\u63cf\u8ff0\u7b26\uff0c\u5426\u5219\u8fd4\u56de undefined<br \/>\nReflect.getOwnPropertyDescriptor(target, propertyKey)<\/p>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nObject.getOwnPropertyDescriptor(obj, 'x')\/\/ {value:1, writable:true, enumerable:true, configurable:true}\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nReflect.getOwnPropertyDescriptor(obj, 'x')\/\/ {value:1, writable:true, enumerable:true, configurable:true}\r\nReflect.getOwnPropertyDescriptor({ x: 'hello' }, 'y')\/\/undefined\r\nReflect.getOwnPropertyDescriptor([], 'length')\/\/ {value:0, writable:true, enumerable:false, configurable:false}\r\n<\/code><\/pre>\n<h4>\u2462 \u5bf9\u6bd4<\/h4>\n<p>\u5982\u679c Reflect.getOwnPropertyDescriptor \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e0d\u662f\u4e00\u4e2a\u5bf9\u8c61\uff08\u4e00\u4e2a\u539f\u59cb\u503c\uff09\uff0c\u90a3\u4e48\u5c06\u9020\u6210 TypeError \u9519\u8bef<br \/>\n\u800c\u5bf9\u4e8e Object.getOwnPropertyDescriptor\uff0c\u975e\u5bf9\u8c61\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u5c06\u88ab\u5f3a\u5236\u8f6c\u6362\u4e3a\u4e00\u4e2a\u5bf9\u8c61\u5904\u7406<\/p>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">Reflect.getOwnPropertyDescriptor(\"foo\", 0);\/\/TypeError:\"foo\"isnotnon-nullobject\r\nObject.getOwnPropertyDescriptor(\"foo\", 0);\/\/ { value:\"f\", writable:false, enumerable:true, configurable:false }\r\n<\/code><\/pre>\n<h3><strong>9\u3001.getPrototypeOf()<\/strong><\/h3>\n<p>\u9759\u6001\u65b9\u6cd5 Reflect.getPrototypeOf() \u4e0e Object.getPrototypeOf() \u65b9\u6cd5\u662f\u4e00\u6837\u7684\uff0c\u90fd\u662f\u8fd4\u56de\u6307\u5b9a\u5bf9\u8c61\u7684\u539f\u578b\uff08\u5373\uff0c\u5185\u90e8\u7684 [[Prototype]] \u5c5e\u6027\u7684\u503c\uff09<br \/>\nReflect.getPrototypeOf(target)<\/p>\n<h4>\u2460 ES5 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const d = New Date()\r\nObject.getPrototypeOf(d)\/\/ {constructor:\u0192, toString:\u0192, toDateString:\u0192, toTimeString:\u0192, toISOString:\u0192, \u2026}\r\n<\/code><\/pre>\n<h4>\u2461 ES6 \u7528\u6cd5<\/h4>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const d = New Date()\r\nReflect.getPrototypeOf(d)\/\/ {constructor:\u0192, toString:\u0192, toDateString:\u0192, toTimeString:\u0192, toISOString:\u0192, \u2026}\r\n<\/code><\/pre>\n<h3><strong>10\u3001.has()<\/strong><\/h3>\n<p>\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u5c5e\u6027\uff0c\u548c in \u8fd0\u7b97\u7b26 \u7684\u529f\u80fd\u5b8c\u5168\u76f8\u540c<br \/>\nReflect.has(target, propertyKey)<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nReflect.has(obj, 'x')  \/\/trueReflect.has(obj, 'z')  \/\/false\r\n<\/code><\/pre>\n<h3><strong>11\u3001.isExtensible()<\/strong><\/h3>\n<p>\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u53ef\u6269\u5c55<br \/>\nReflect.isExtensible \u4e0e Object.isExtensible \u65b9\u6cd5\u4e00\u6837\uff0c\u90fd\u662f\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u53ef\u6269\u5c55 \uff08\u5373\u662f\u5426\u80fd\u591f\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\uff09<br \/>\nReflect.isExtensible(target)<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nReflect.isExtensible(obj)  \/\/true\r\nObject.freeze(obj)  \/\/\u963b\u6b62\u65b0\u5c5e\u6027\u6dfb\u52a0\u5230\u5bf9\u8c61obj.z = 3\r\nReflect.isExtensible(obj)  \/\/falseobj  \/\/ {x:1, y:2}\r\n<\/code><\/pre>\n<h3><strong>12\u3001.ownKeys()<\/strong><\/h3>\n<p>\u5224\u65ad\u5bf9\u8c61\u81ea\u8eab\u5c5e\u6027<br \/>\nReflect.ownKeys \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7531\u76ee\u6807\u5bf9\u8c61\u81ea\u8eab\u7684\u5c5e\u6027\u952e\u7ec4\u6210\u7684\u6570\u7ec4\uff0c\u5b83\u7684\u8fd4\u56de\u503c\u7b49\u540c\u4e8e `Object.getOwnPropertyNames(target).concat(Object.getOwnPropertySymbols(target))<br \/>\nReflect.ownKeys(target)<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nReflect.ownKeys(obj)  \/\/ [\"x\", \"y\"]Reflect.ownKeys([])  \/\/ [\"length\"]Reflect.ownKeys([1, 2])  \/\/ [\"0\", \"1\", \"length\"]\r\n<\/code><\/pre>\n<h3><strong>13\u3001.preventExtensions()<\/strong><\/h3>\n<p>\u963b\u6b62\u65b0\u5c5e\u6027\u6dfb\u52a0\u5230\u5bf9\u8c61\uff0c\u7b49\u540c\u4e8eObject.freeze()<br \/>\nReflect.preventExtensions \u65b9\u6cd5\u963b\u6b62\u65b0\u5c5e\u6027\u6dfb\u52a0\u5230\u5bf9\u8c61\uff0c\u4f8b\u5982\uff1a\u9632\u6b62\u5c06\u6765\u5bf9\u5bf9\u8c61\u7684\u6269\u5c55\u88ab\u6dfb\u52a0\u5230\u5bf9\u8c61\u4e2d\uff0c\u4e0e Object.preventExtensions() \u65b9\u6cd5\u4e00\u81f4<\/p>\n<p>Reflect.preventExtensions(target)<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }\r\nReflect.isExtensible(obj)  \/\/true\r\nReflect.preventExtensions(obj)  \/\/\u963b\u6b62\u65b0\u5c5e\u6027\u6dfb\u52a0\u5230\u5bf9\u8c61obj.z = 3\r\nReflect.isExtensible(obj)  \/\/falseobj  \/\/ {x:1, y:2}\r\n<\/code><\/pre>\n<h3><strong>14\u3001.set()<\/strong><\/h3>\n<p>\u5199\u6570\u636e<br \/>\nReflect.set \u65b9\u6cd5\u5141\u8bb8\u4f60\u5728\u5bf9\u8c61\u4e0a\u8bbe\u7f6e\u5c5e\u6027\uff0c\u7528\u6765\u7ed9\u5c5e\u6027\u8d4b\u503c\uff0c\u7c7b\u4f3c property accessor \u7684\u8bed\u6cd5\uff0c\u4f46\u5b83\u662f\u4ee5\u51fd\u6570\u7684\u65b9\u5f0f<br \/>\nReflect.set(target, propertyKey, value[, receiver])<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const obj = { x: 1, y: 2 }Reflect.set(obj, 'z', 4)\r\nobj  \/\/ {x:1, y:2, z:4}\r\nconst arr = ['apple', 'pear']Reflect.set(arr, 1, 'banana')\r\narr  \/\/ [\"apple\", \"banana\"]\r\n<\/code><\/pre>\n<h3><strong>15\u3001.setPrototypeOf()<\/strong><\/h3>\n<p>Reflect.setPrototypeOf \u65b9\u6cd5\u6539\u53d8\u6307\u5b9a\u5bf9\u8c61\u7684\u539f\u578b \uff08\u5373\u5185\u90e8\u7684 [[Prototype]] \u5c5e\u6027\u503c\uff09<br \/>\nReflect.setPrototypeOf(target, prototype)<\/p>\n<pre><code class=\"language-javascript\" lang=\"javascript\">const arr = ['apple', 'pear']\r\nReflect.getPrototypeOf(arr)\r\n\/\/ [constructor: \u0192, concat: \u0192, copyWithin: \u0192, fill: \u0192, find: \u0192,\u2026]\r\n\r\nReflect.setPrototypeOf(arr, String.prototype)\r\nReflect.getPrototypeOf(arr)\r\n\/\/ String {\"\", constructor: \u0192, anchor: \u0192, big: \u0192, blink: \u0192, \u2026}\r\n<\/code><\/pre>\n<p>\u539f\u6587:https:\/\/www.cnblogs.com\/Leophen\/p\/14838608.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u4ec0\u4e48\u662f\u53cd\u5c04\u673a\u5236 \u53cd\u5c04\u673a\u5236\u662f\u5728\u7f16\u8bd1\u9636\u6bb5\u4e0d\u77e5\u9053\u662f\u54ea\u4e2a\u7c7b\u88ab\u52a0\u8f7d\uff0c\u800c\u662f\u5728\u8fd0\u884c\u7684\u65f6\u5019\u624d\u52a0\u8f7d\u3001\u6267\u884c\u3002 \u4e5f\u5c31\u662f\u8bf4\uff0c\u53cd\u5c04\u673a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[109],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/3259"}],"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=3259"}],"version-history":[{"count":4,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/3259\/revisions"}],"predecessor-version":[{"id":3264,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/3259\/revisions\/3264"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}