{"id":804,"date":"2017-03-29T14:52:04","date_gmt":"2017-03-29T06:52:04","guid":{"rendered":"http:\/\/feizhaojun.com\/?p=804"},"modified":"2017-03-29T14:52:04","modified_gmt":"2017-03-29T06:52:04","slug":"object-defineproperty%e9%bb%98%e8%ae%a4%e5%80%bc%e6%98%affalse%e7%9a%84%e8%af%af%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/feizhaojun.com\/?p=804","title":{"rendered":"Object.defineProperty()\u9ed8\u8ba4\u503c\u662ffalse\u7684\u8bef\u89e3"},"content":{"rendered":"

\u5728JavaScript\u4e2d\uff0c\u901a\u8fc7Object.defineProperty()\u65b9\u6cd5\u6765\u5b9a\u4e49\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u8be6\u60c5\u53ef\u4ee5\u53c2\u7167\u300aJavaScript\u9ad8\u7ea7\u7a0b\u5e8f\u8bbe\u8ba1\u300b\u7b2c3\u7248\u7b2c6\u7ae06.1.1\u5c5e\u6027\u7c7b\u578b\uff08\u7b2c139\u9875\uff09\u3002<\/p>\n

\u4e66\u4e2d\u6307\u51fa\uff1a<\/p>\n

\u201c\u6ce8\u610f\u5728\u8c03\u7528Object.defineProperty()\u65b9\u6cd5\u65f6\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\uff0c configurable\uff0c enumerable\uff0c writable\u7279\u6027\u7684\u9ed8\u8ba4\u503c\u90fd\u662ffalse<\/span>\u201d<\/em><\/p>\n

\u4f46\u662f\u5047\u5982\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5bf9\u8c61obj\uff1a<\/p>\n

[javascript]
\n'use strict';<\/p>\n

var obj = {
\n name:'Mukti'
\n}
\n\/\/ \u6211\u4eec\u5728\u5bf9\u8c61obj.name\u4e0a\u4f7f\u7528defineProperty\u65b9\u6cd5\uff0c\u4fee\u6539name\u7684value
\nObject.defineProperty(obj, 'name', {
\n value: 'Change Mukti'
\n});<\/p>\n

\/\/ \u4e0a\u9762\u6211\u4eec\u5e76\u6ca1\u6709\u6307\u5b9aConfigurable\u3001Enumerable\u548cWritable\uff0c\u90a3\u662f\u4e0d\u662f\u8fd9\u4e09\u4e2a\u90fd\u88ab\u8d4b\u503c\u4e3afalse\u4e86\u5462\uff1f\u6211\u4eec\u5728\u4fee\u6539\u4e00\u4e0b\u8bd5\u8bd5\uff1a<\/p>\n

obj.name = 'Change again';<\/p>\n

\/\/ \u6211\u4eec\u53d1\u73b0obj.name\u4f9d\u65e7\u53ef\u4ee5\u4fee\u6539\uff0c\u4e5f\u5c31\u662f\u8bf4name\u7684Writable\u503c\u5e76\u4e0d\u662ffalse<\/p>\n

[\/javascript]<\/p>\n

\u5176\u5b9e\u6211\u4eec\u5728\u6700\u521d\u58f0\u660eobj\u7684\u65f6\u5019\uff0c\u5c31\u5df2\u7ecf\u7ed9name\u8d4b\u503c\u4e86<\/span>\uff0c\u6240\u4ee5name\u7684Configurable\u3001Enumerable\u548cWritable\u90fd\u5df2\u7ecf\u662ftrue\u4e86\u3002<\/p>\n

\u73b0\u5728\u6211\u4eec\u91cd\u65b0\u4f7f\u7528defineProperty\u65b9\u6cd5\u5b9a\u4e49\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\uff1a<\/p>\n

[javascript]<\/p>\n

var obj2 = {};<\/p>\n

Object.defineProperty(obj2, 'name', {
\n value: 'Mukti'
\n});<\/p>\n

\/\/ \u4e0a\u9762\u6211\u4eec\u53ea\u5b9a\u4e49\u4e86value\u7684\u503c\uff0c\u5e76\u6ca1\u6709\u6307\u5b9aConfigurable\u3001Enumerable\u548cWritable\uff0c\u6240\u4ee5\u4ed6\u4eec\u7684\u503c\u90fd\u662ffalse\uff0c\u8fd9\u65f6\u5019\u518d\u91cd\u65b0\u8d4b\u503c\u7ed9obj.name\u5c31\u4f1a\u65e0\u6548\u4e86\uff1a<\/p>\n

obj.name = 'Change Mukti'; \/\/ \u65e0\u6548\uff0c\u4e25\u683c\u6a21\u5f0f\u62a5\u9519<\/p>\n

[\/javascript]<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728JavaScript\u4e2d\uff0c\u901a\u8fc7Object.defineProperty()\u65b9\u6cd5\u6765\u5b9a\u4e49\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u8be6\u60c5\u53ef\u4ee5\u53c2\u7167\u300aJava…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,5],"tags":[],"class_list":["post-804","post","type-post","status-publish","format-standard","hentry","category-fe","category-javascript"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/804","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=804"}],"version-history":[{"count":1,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/804\/revisions"}],"predecessor-version":[{"id":805,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/804\/revisions\/805"}],"wp:attachment":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}