{"id":12090,"date":"2023-11-28T22:43:11","date_gmt":"2023-11-28T14:43:11","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12090"},"modified":"2023-11-28T22:43:15","modified_gmt":"2023-11-28T14:43:15","slug":"qian-duan-mian-shi-ti-shen-me-shinan-yi-ji-ru-he-j","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/qian-duan-mian-shi-ti-shen-me-shinan-yi-ji-ru-he-j\/","title":{"rendered":"\u524d\u7aef\u9762\u8bd5\u9898\uff1a\u4ec0\u4e48\u662fNaN?\u4ee5\u53ca\u5982\u4f55\u68c0\u67e5\u503c\u662f\u5426\u4e3aNaN?"},"content":{"rendered":"<p>NaN\u8868\u793a\u201c\u975e\u6570\u5b57\u201d\u662fJS\u4e2d\u7684\u4e00\u4e2a\u503c\uff0c\u8be5\u503c\u662f\u5c06\u6570\u5b57\u8f6c\u6362\u6216\u6267\u884c\u4e3a\u975e\u6570\u5b57\u503c\u7684\u8fd0\u7b97\u7ed3\u679c\uff0c\u56e0 \u6b64\u7ed3\u679c\u4e3aNaN<br \/>\nlet a\uff1b<br \/>\nconsole. log(parselnt(&#8216;  abc&#8217; ))\uff1b \/\/ NaN<br \/>\nconsole.log(parselnt(null))\uff1b \/\/ NaN<br \/>\nconsole. log(parselnt(undefined))\uff1b \/\/ NaN<br \/>\nconsole. log(parselnt(++a)); \/\/ NaN<br \/>\nconsole. log(parselnt({} * 10))\uff1b \/\/ NaN<br \/>\nconsole. log(parselnt(&#8216;abc&#8217;  &#8211; 2))\uff1b \/\/ NaN<br \/>\nconsole.log(parselnt(0 \/ 0))\uff1b \/\/ NaN<br \/>\nconsole.log(parselnt(&#8217;10a&#8217; * 10))\uff1b \/\/ NaN<br \/>\nJS\u6709\u4e00\u4e2a\u5185\u7f6e\u7684isNaN\u65b9\u6cd5\uff0c\u7528\u4e8e\u6d4b\u8bd5\u503c\u662f\u5426\u4e3aisNaN\u503c\uff0c\u4f46\u662f\u8fd9\u4e2a\u51fd\u6570\u6709\u4e00\u4e2a\u5947\u602a\u7684\u884c\u4e3a\u3002<br \/>\nconsole. log (isNaN()) \uff1b \/\/ true<br \/>\nconsole.log(isNaN(undefined))\uff1b \/\/ true<br \/>\nconsole. log(isNaN({})); \/\/ true<br \/>\nconsole. log(isNaN(String(&#8216;a&#8217;)))\uff1b \/\/ true<br \/>\nconsole.log(isNaN(() =&gt; { })); \/\/ true<br \/>\n\u6240\u6709\u8fd9\u4e9bconsole. log\u8bed\u53e5\u90fd\u8fd4\u56detrue,\u5373\u4f7f\u6211\u4eec\u4f20\u9012\u7684\u503c\u4e0d\u662fNaN\u3002<br \/>\n\u5728ES6\u4e2d\uff0c\u5efa\u8bae\u4f7f\u7528Number. isNaN\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u786e\u5b9e\u4f1a\u68c0\u67e5\u8be5\u503c(\u5982\u679c\u786e\u5b9e\u662fNaN),\u6216\u8005 \u6211\u4eec\u53ef\u4ee5\u4f7f\u81ea\u5df1\u7684\u8f85\u52a9\u51fd\u6570\u68c0\u67e5\u6b64\u95ee\u9898\uff0c\u56e0\u4e3a\u5728JS\u4e2d\uff0cNaN\u662f\u552f\u4e00\u7684\u503c\uff0c\u5b83\u4e0d\u7b49\u4e8e\u81ea\u5df1\u3002<br \/>\nfunction checklfNaN(value) { return value !== value\uff1b }<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NaN\u8868\u793a\u201c\u975e\u6570\u5b57\u201d\u662fJS\u4e2d\u7684\u4e00\u4e2a\u503c\uff0c\u8be5\u503c\u662f\u5c06\u6570\u5b57\u8f6c\u6362\u6216\u6267\u884c\u4e3a\u975e\u6570\u5b57\u503c\u7684\u8fd0\u7b97\u7ed3\u679c\uff0c\u56e0 \u6b64\u7ed3\u679c\u4e3aNaN let  [&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-12090","post","type-post","status-publish","format-standard","hentry","category-qianduan"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12090","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=12090"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12090\/revisions"}],"predecessor-version":[{"id":12091,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12090\/revisions\/12091"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12090"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}