{"id":12738,"date":"2023-11-28T23:05:05","date_gmt":"2023-11-28T15:05:05","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12738"},"modified":"2023-11-28T23:15:16","modified_gmt":"2023-11-28T15:15:16","slug":"qian-duan-mian-shi-ti-shen-me-shi-bao-zhuang-dui-x","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/qian-duan-mian-shi-ti-shen-me-shi-bao-zhuang-dui-x\/","title":{"rendered":"\u524d\u7aef\u9762\u8bd5\u9898\uff1a\u4ec0\u4e48\u662f\u5305\u88c5\u5bf9\u8c61(wrapper object) ?"},"content":{"rendered":"<p>\u6211\u4eec\u73b0\u5728\u590d\u4e60\u4e00\u4e0bJS\u7684\u6570\u636e\u7c7b\u578b\uff0cJS\u6570\u636e\u7c7b\u578b\u88ab\u5206\u4e3a\u4e24\u5927\u7c7b\uff0c\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u3002<br \/>\n\u57fa\u672c\u7c7b\u578b\uff1aUndefined,Null,Boolean,Number,String,Symbol,BigInt<br \/>\n\u5f15\u7528\u7c7b\u578b\uff1aObject,Array,Date,RegExp\u7b49\uff0c\u8bf4\u767d\u4e86\u5c31\u662f\u5bf9\u8c61\u3002<br \/>\n\u5176\u4e2d\u5f15\u7528\u7c7b\u578b\u6709\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u4f46\u662f\u57fa\u672c\u7c7b\u578b\u662f\u6ca1\u6709\u7684\uff0c\u4f46\u6211\u4eec\u7ecf\u5e38\u4f1a\u770b\u5230\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<br \/>\nlet name = &quot;marko&quot;\uff1b<br \/>\nconsole. log(typeof name)\uff1b \/\/ &quot;string&quot;<br \/>\nconsole. log(name. toUpperCase())\uff1b \/\/ &quot;MARKO&quot;<br \/>\nname\u7c7b\u578b\u662fstring,\u5c5e\u4e8e\u57fa\u672c\u7c7b\u578b\uff0c\u6240\u4ee5\u5b83\u6ca1\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4f46\u662f\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u8c03\u7528 \u4e86\u4e00\u4e2atoUpperCase()\u65b9\u6cd5\uff0c\u5b83\u4e0d\u4f1a\u629b\u51fa\u9519\u8bef\uff0c\u8fd8\u8fd4\u56de\u4e86\u5bf9\u8c61\u7684\u53d8\u91cf\u503c\u3002<br \/>\n\u539f\u56e0\u662f\u57fa\u672c\u7c7b\u578b\u7684\u503c\u88ab\u4e34\u65f6\u8f6c\u6362\u6216\u5f3a\u5236\u8f6c\u6362\u4e3a\u5bf9\u8c61\uff0c\u56e0\u6b64name\u53d8\u91cf\u7684\u884c\u4e3a\u7c7b\u4f3c\u4e8e\u5bf9\u8c61\u3002\u9664mill \u548cundefined\u4e4b\u5916\u7684\u6bcf\u4e2a\u57fa\u672c\u7c7b\u578b\u90fd\u6709\u81ea\u5df1\u5305\u88c5\u5bf9\u8c61\u3002\u4e5f\u5c31\u662f\uff1aString, Number, Boolean, Symbol\u548cBiglnt\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b<br \/>\nname. toUpperCase ()\u5728\u5e55\u540e\u770b\u8d77\u6765\u5982\u4e0b\uff1a<br \/>\nconsole. log(new String(name). toUpperCase()) \uff1b \/\/ &quot;MARKO&quot;<br \/>\n\u5728\u5b8c\u6210\u8bbf\u95ee\u5c5e\u6027\u6216\u8c03\u7528\u65b9\u6cd5\u4e4b\u540e\uff0c\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u5c06\u7acb\u5373\u88ab\u4e22\u5f03\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u4eec\u73b0\u5728\u590d\u4e60\u4e00\u4e0bJS\u7684\u6570\u636e\u7c7b\u578b\uff0cJS\u6570\u636e\u7c7b\u578b\u88ab\u5206\u4e3a\u4e24\u5927\u7c7b\uff0c\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u3002 \u57fa\u672c\u7c7b\u578b\uff1aUndefined, [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-12738","post","type-post","status-publish","format-standard","hentry","category-qianduan"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12738"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12738\/revisions"}],"predecessor-version":[{"id":12739,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12738\/revisions\/12739"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12738"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}