{"id":328,"date":"2023-10-17T16:58:13","date_gmt":"2023-10-17T08:58:13","guid":{"rendered":"https:\/\/www.qzdd.net\/?p=328"},"modified":"2023-10-17T16:58:13","modified_gmt":"2023-10-17T08:58:13","slug":"%e6%b5%8b%e8%af%95%e5%af%b9%e8%b1%a1%e5%b1%9e%e6%80%a7","status":"publish","type":"post","link":"https:\/\/www.qzdd.net\/?p=328","title":{"rendered":"\u6d4b\u8bd5\u5bf9\u8c61\u5c5e\u6027"},"content":{"rendered":"\n<p><strong>in<\/strong> <em>\u81ea\u6709\u5c5e\u6027\u3001\u7ee7\u627f\u5c5e\u6027\u8fd4\u56detrue<\/em><br><strong>obj.hasOwnProperty(&#8216;key&#8217;)<\/strong>  <em>\u81ea\u6709\u5c5e\u6027\u8fd4\u56detrue\uff08Object.creat(null)\u521b\u5efa\u7684\u6ca1\u6709\u539f\u578b\u7684\u5bf9\u8c61\u65e0\u6cd5\u8c03\u7528\uff0c\u4e5f\u4e0d\u80fd\u6392\u9664\u6b64\u65b9\u6cd5\u88ab\u6539\u5199\uff0c\u4e0d\u63a8\u8350\u4f7f\u7528\uff09<\/em><br><strong>Object.prototype.hasOwnProperty(obj, &#8216;key&#8217;)<\/strong> <em>\u81ea\u6709\u5c5e\u6027\u8fd4\u56detrue<\/em><br><strong>Object.hasOwn(obj, &#8216;key&#8217;)<\/strong> <em>\u9759\u6001\u65b9\u6cd5\u4ee3\u66ffhasOwnProperty\uff08\u63a8\u8350\uff09<\/em><br><strong>Object.prototype.propertyIsEnumerable.call(obj, &#8216;key&#8217;)<\/strong> <em>\u81ea\u6709\u5c5e\u6027\u4e14 \u53ef\u679a\u4e3e\u8fd4\u56detrue<\/em><br><strong>Object.getOwnPropertyDescriptor(obj, &#8216;key&#8217;)?.enumerable<\/strong> <em>\u9759\u6001\u65b9\u6cd5 \u81ea\u6709\u5c5e\u6027\u4e14 \u53ef\u679a\u4e3e\u8fd4\u56detrue<\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>Object.keys() <\/strong> \u8fd4\u56de <em>\u81ea\u6709\uff0c\u53ef\u679a\u4e3e<\/em> \u5c5e\u6027\u7ec4\u6210\u7684\u6570\u7ec4\uff08Symbol\u5c5e\u6027\u4e0d\u8fd4\u56de\uff09\n<strong>Object.getOwnPropertyNames()<\/strong>  \u8fd4\u56de <em>\u81ea\u6709\u5c5e\u6027<\/em>\uff08\u5305\u62ec\u4e0d\u53ef\u679a\u4e3e\uff09\u7ec4\u6210\u7684\u6570\u7ec4\uff08Symbol\u5c5e\u6027\u4e0d\u8fd4\u56de\uff09\n<strong>Object.getOwnPropertySymbols()<\/strong>   \u8fd4\u56de <em>\u81ea\u6709Symbol<\/em>\u5c5e\u6027\uff08\u5305\u62ec\u4e0d\u53ef\u679a\u4e3e\uff09 \u7ec4\u6210\u7684\u6570\u7ec4\n<strong>Reflect.ownKeys()<\/strong>  \u8fd4\u56de <em>\u81ea\u6709\u6240\u6709\u5c5e\u6027<\/em>\uff08\u5b57\u7b26\u4e32\uff0cSymbol\uff0c\u53ef\u679a\u4e3e\uff0c\u4e0d\u53ef\u679a\u4e3e\uff09\u7ec4\u6210\u7684\u6570\u7ec4\nfor\/in \u5faa\u73af \u81ea\u6709\u548c\u7ee7\u627f\u7684\u53ef\u679a\u4e3e\u5c5e\u6027<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>in \u81ea\u6709\u5c5e\u6027\u3001\u7ee7\u627f\u5c5e\u6027\u8fd4\u56detrueobj.hasOwnProperty(&#8216;key&#8217;) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[43,44,52],"class_list":["post-328","post","type-post","status-publish","format-standard","hentry","category-base","tag-hasown","tag-hasownproperty","tag-propertyisenumerable"],"_links":{"self":[{"href":"https:\/\/www.qzdd.net\/index.php?rest_route=\/wp\/v2\/posts\/328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.qzdd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.qzdd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.qzdd.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qzdd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=328"}],"version-history":[{"count":0,"href":"https:\/\/www.qzdd.net\/index.php?rest_route=\/wp\/v2\/posts\/328\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.qzdd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.qzdd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.qzdd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}