{"id":168512,"date":"2024-05-08T16:25:19","date_gmt":"2024-05-08T08:25:19","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168512.html"},"modified":"2024-05-08T16:25:22","modified_gmt":"2024-05-08T08:25:22","slug":"javascript-%e6%80%8e%e4%b9%88%e5%88%9b%e5%bb%ba%e9%98%b2%e7%af%a1%e6%94%b9%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168512.html","title":{"rendered":"JavaScript \u600e\u4e48\u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27034716\/988871fc-e8e4-4dd8-b199-f0801073b1cc.webp\" alt=\"JavaScript \u600e\u4e48\u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\" \/><\/p>\n<p><p>JavaScript \u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\u4e3b\u8981\u662f\u901a\u8fc7\u5185\u7f6e\u7684 <code>Object<\/code> \u5bf9\u8c61\u7684\u4e00\u4e9b\u65b9\u6cd5\u5b9e\u73b0\u7684\uff0c\u5982 <code>Object.freeze()<\/code>\u3001<code>Object.seal()<\/code> \u53ca <code>Object.preventExtensions()<\/code>\uff0c<strong>\u8fd9\u4e9b\u65b9\u6cd5\u80fd\u591f\u9650\u5236\u5bf9\u8c61\u7684\u53ef\u53d8\u6027\uff0c\u786e\u4fdd\u5bf9\u8c61\u5728\u4e0d\u540c\u7a0b\u5ea6\u4e0a\u4e0d\u88ab\u6539\u53d8<\/strong>\u3002<strong><code>Object.freeze()<\/code> \u63d0\u4f9b\u4e86\u6700\u9ad8\u7ea7\u522b\u7684\u9632\u7be1\u6539\u80fd\u529b\uff0c\u5b83\u4f1a\u51bb\u7ed3\u5bf9\u8c61\uff0c\u4f7f\u5f97\u5bf9\u8c61\u7684\u5c5e\u6027\u4e0d\u53ef\u5199\u3001\u4e0d\u53ef\u914d\u7f6e\uff0c\u4e5f\u65e0\u6cd5\u6dfb\u52a0\u65b0\u5c5e\u6027<\/strong>\u3002\u8fd9\u4e9b\u65b9\u6cd5\u7684\u4f7f\u7528\u53ef\u4ee5\u6709\u6548\u907f\u514d\u4ee3\u7801\u4e2d\u7684\u5bf9\u8c61\u88ab\u975e\u671f\u671b\u7684\u4fee\u6539\uff0c\u6709\u52a9\u4e8e\u4fdd\u62a4\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<\/p>\n<p><p>\u4e00\u3001OBJECT.FREEZE()<\/p>\n<p><code>Object.freeze()<\/code> \u662f\u521b\u5efa\u4e0d\u53ef\u53d8\u5bf9\u8c61\u7684\u6700\u4e25\u683c\u65b9\u6cd5\u3002\u8c03\u7528\u540e\uff0c\u5bf9\u8c61\u7684\u5c5e\u6027\u4e0d\u53ef\u4fee\u6539\uff0c\u4e5f\u65e0\u6cd5\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\u6216\u5220\u9664\u5df2\u6709\u5c5e\u6027\u3002\u6b64\u5916\uff0c\u5bf9\u8c61\u7684\u539f\u578b\u4e5f\u4e0d\u80fd\u88ab\u6539\u53d8\u3002\u91cd\u8981\u7684\u662f\uff0c<strong>\u51bb\u7ed3\u5bf9\u8c61\u540e\uff0c\u5176\u5c5e\u6027\u7684\u503c\u4e5f\u4e0d\u80fd\u88ab\u4fee\u6539<\/strong>\u3002<\/p>\n<\/p>\n<p><h3>\u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n<p><p>\u4e0b\u9762\u662f\u4e00\u6bb5\u4f7f\u7528 <code>Object.freeze()<\/code> \u65b9\u6cd5\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">const myObject = {<\/p>\n<p>  property1: 42<\/p>\n<p>};<\/p>\n<p>Object.freeze(myObject);<\/p>\n<p>myObject.property1 = 33; \/\/ \u65e0\u6548\uff0c\u5c5e\u6027\u503c\u4ecd\u7136\u662f 42<\/p>\n<p>delete myObject.property1; \/\/ \u65e0\u6548\uff0c\u5c5e\u6027\u65e0\u6cd5\u5220\u9664<\/p>\n<p>myObject.property2 = &#039;new&#039;; \/\/ \u65e0\u6548\uff0c\u65e0\u6cd5\u6dfb\u52a0\u65b0\u5c5e\u6027<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u5c1d\u8bd5\u66f4\u6539\u3001\u5220\u9664\u6216\u6dfb\u52a0\u5c5e\u6027\u5230 <code>myObject<\/code> \u90fd\u5c06\u5931\u8d25\uff0c\u56e0\u4e3a\u5b83\u5df2\u7ecf\u88ab\u51bb\u7ed3\u3002<\/p>\n<\/p>\n<p><h3>\u68c0\u6d4b\u5bf9\u8c61\u662f\u5426\u88ab\u51bb\u7ed3<\/h3>\n<\/p>\n<p><p>\u901a\u8fc7\u4f7f\u7528 <code>Object.isFrozen()<\/code> \u53ef\u4ee5\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5df2\u7ecf\u88ab\u51bb\u7ed3\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (Object.isFrozen(myObject)) {<\/p>\n<p>  console.log(&#039;\u5bf9\u8c61\u5df2\u51bb\u7ed3\uff0c\u65e0\u6cd5\u4fee\u6539\u6216\u6269\u5c55\u3002&#039;);<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4e8c\u3001OBJECT.SEAL()<\/p>\n<p>\u4e0e <code>Object.freeze()<\/code> \u7c7b\u4f3c\uff0c<code>Object.seal()<\/code> \u4e5f\u7528\u4e8e\u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\u3002\u5f53\u5bf9\u8c61\u88ab\u5bc6\u5c01\u540e\uff0c\u5b83\u7684\u5c5e\u6027\u4ecd\u7136\u53ef\u4ee5\u88ab\u4fee\u6539\uff0c\u4f46\u662f\u4e0d\u80fd\u6dfb\u52a0\u65b0\u5c5e\u6027\u6216\u5220\u9664\u65e7\u5c5e\u6027\uff0c\u5c5e\u6027\u7684\u914d\u7f6e\u6027\uff08configurable\uff09\u4e5f\u4f1a\u88ab\u8bbe\u7f6e\u4e3a <code>false<\/code>\u3002<\/p>\n<\/p>\n<p><h3>\u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528 <code>Object.seal()<\/code> \u65b9\u6cd5\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">const mySealedObject = {<\/p>\n<p>  property1: 42<\/p>\n<p>};<\/p>\n<p>Object.seal(mySealedObject);<\/p>\n<p>mySealedObject.property1 = 33; \/\/ \u6709\u6548\uff0c\u5c5e\u6027\u503c\u88ab\u4fee\u6539\u4e3a 33<\/p>\n<p>delete mySealedObject.property1; \/\/ \u65e0\u6548\uff0c\u5c5e\u6027\u65e0\u6cd5\u5220\u9664<\/p>\n<p>mySealedObject.property2 = &#039;new&#039;; \/\/ \u65e0\u6548\uff0c\u65e0\u6cd5\u6dfb\u52a0\u65b0\u5c5e\u6027<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u68c0\u6d4b\u5bf9\u8c61\u662f\u5426\u88ab\u5bc6\u5c01<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528 <code>Object.isSealed()<\/code> \u65b9\u6cd5\u6765\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u88ab\u5bc6\u5c01\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (Object.isSealed(mySealedObject)) {<\/p>\n<p>  console.log(&#039;\u5bf9\u8c61\u5df2\u5bc6\u5c01\uff0c\u53ef\u4ee5\u4fee\u6539\u5c5e\u6027\u503c\uff0c\u4f46\u65e0\u6cd5\u6dfb\u52a0\u6216\u5220\u9664\u5c5e\u6027\u3002&#039;);<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4e09\u3001OBJECT.PREVENTEXTENSIONS()<\/p>\n<p>\u4f7f\u7528 <code>Object.preventExtensions()<\/code> \u53ef\u4ee5\u963b\u6b62\u65b0\u5c5e\u6027\u88ab\u6dfb\u52a0\u5230\u5bf9\u8c61\u4e0a\u3002\u5df2\u6709\u7684\u5c5e\u6027\u53ef\u4ee5\u88ab\u4fee\u6539\u6216\u5220\u9664\uff0c\u4f46\u5bf9\u8c61\u4e0d\u80fd\u88ab\u6269\u5c55\u3002<\/p>\n<\/p>\n<p><h3>\u793a\u4f8b\u4ee3\u7801<\/h3>\n<\/p>\n<p><p>\u4ee5\u4e0b\u662f\u4f7f\u7528 <code>Object.preventExtensions()<\/code> \u65b9\u6cd5\u7684\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">const myPreventedObject = {<\/p>\n<p>  property1: 42<\/p>\n<p>};<\/p>\n<p>Object.preventExtensions(myPreventedObject);<\/p>\n<p>myPreventedObject.property1 = 33; \/\/ \u6709\u6548\uff0c\u5c5e\u6027\u503c\u88ab\u4fee\u6539\u4e3a 33<\/p>\n<p>delete myPreventedObject.property1; \/\/ \u6709\u6548\uff0c\u5c5e\u6027\u53ef\u4ee5\u88ab\u5220\u9664<\/p>\n<p>myPreventedObject.property2 = &#039;new&#039;; \/\/ \u65e0\u6548\uff0c\u65e0\u6cd5\u6dfb\u52a0\u65b0\u5c5e\u6027<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u68c0\u6d4b\u5bf9\u8c61\u662f\u5426\u53ef\u6269\u5c55<\/h3>\n<\/p>\n<p><p>\u53ef\u4ee5\u7528 <code>Object.isExtensible()<\/code> \u65b9\u6cd5\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u53ef\u6269\u5c55\u7684\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (!Object.isExtensible(myPreventedObject)) {<\/p>\n<p>  console.log(&#039;\u5bf9\u8c61\u65e0\u6cd5\u88ab\u6269\u5c55\uff0c\u53ef\u4ee5\u4fee\u6539\u6216\u5220\u9664\u73b0\u6709\u5c5e\u6027\u3002&#039;);<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0cJavaScript\u5f00\u53d1\u8005\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u9700\u6c42\u521b\u5efa\u4e0d\u540c\u7a0b\u5ea6\u7684\u9632\u7be1\u6539\u5bf9\u8c61\uff0c\u4ee5\u6b64\u6765\u786e\u4fdd\u4ee3\u7801\u4e2d\u7684\u6570\u636e\u5b89\u5168\u53ca\u5176\u5b8c\u6574\u6027\u3002\u5728\u9ad8\u5b89\u5168\u6027\u9700\u6c42\u7684\u5e94\u7528\u4e2d\uff0c\u8fd9\u4e9b\u6280\u672f\u7279\u522b\u6709\u7528\uff0c\u6bd4\u5982\u5728\u9632\u6b62\u5916\u90e8\u811a\u672c\u975e\u6cd5\u7be1\u6539\u5173\u952e\u6570\u636e\u5bf9\u8c61\u65f6\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u4ec0\u4e48\u662f\u9632\u7be1\u6539\u5bf9\u8c61\uff1f<\/strong>\u9632\u7be1\u6539\u5bf9\u8c61\u662f\u6307\u4f7f\u7528JavaScript\u521b\u5efa\u7684\u4e00\u79cd\u7279\u6b8a\u5bf9\u8c61\uff0c\u5b83\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u4e0d\u53ef\u88ab\u968f\u610f\u4fee\u6539\u3001\u5220\u9664\u6216\u6dfb\u52a0\u3002<\/p>\n<p><strong>\u5982\u4f55\u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\uff1f<\/strong>\u5728JavaScript\u4e2d\uff0c\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\u3002\u4e00\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Object.preventExtensions()\u65b9\u6cd5\u6765\u963b\u6b62\u4e00\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\u3002\u53e6\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528Object.seal()\u65b9\u6cd5\u5c06\u4e00\u4e2a\u5bf9\u8c61\u5c01\u95ed\u8d77\u6765\uff0c\u9632\u6b62\u4fee\u6539\u548c\u5220\u9664\u73b0\u6709\u7684\u5c5e\u6027\u3002\u8fd8\u6709\u4e00\u79cd\u66f4\u4e25\u683c\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Object.freeze()\u65b9\u6cd5\u6765\u51bb\u7ed3\u5bf9\u8c61\uff0c\u4f7f\u5176\u5c5e\u6027\u65e0\u6cd5\u4fee\u6539\u3001\u5220\u9664\u548c\u6dfb\u52a0\u3002<\/p>\n<p><strong>\u9632\u7be1\u6539\u5bf9\u8c61\u6709\u54ea\u4e9b\u5e94\u7528\u573a\u666f\uff1f<\/strong>\u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\u7684\u76ee\u7684\u662f\u4fdd\u62a4\u5bf9\u8c61\u7684\u6570\u636e\u5b8c\u6574\u6027\u548c\u5b89\u5168\u6027\u3002\u9632\u7be1\u6539\u5bf9\u8c61\u53ef\u4ee5\u5728\u9700\u8981\u4fdd\u62a4\u6570\u636e\u7684\u573a\u666f\u4e2d\u4f7f\u7528\uff0c\u4f8b\u5982\u5728\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5b58\u50a8\u654f\u611f\u4fe1\u606f\u3001\u6388\u6743\u4fe1\u606f\u6216\u8005\u52a0\u5bc6\u5bc6\u94a5\u3002\u9632\u7be1\u6539\u5bf9\u8c61\u8fd8\u53ef\u4ee5\u7528\u4e8e\u5bf9\u5916\u63d0\u4f9b\u4e00\u4e2a\u5b89\u5168\u7684API\uff0c\u786e\u4fdd\u5916\u90e8\u4ee3\u7801\u4e0d\u80fd\u4fee\u6539\u6216\u6ee5\u7528\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript \u521b\u5efa\u9632\u7be1\u6539\u5bf9\u8c61\u4e3b\u8981\u662f\u901a\u8fc7\u5185\u7f6e\u7684 Object \u5bf9\u8c61\u7684\u4e00\u4e9b\u65b9\u6cd5\u5b9e\u73b0\u7684\uff0c\u5982 Object.f [&hellip;]","protected":false},"author":3,"featured_media":168519,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/168512"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=168512"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/168512\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/168519"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=168512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=168512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=168512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}