{"id":12454,"date":"2023-11-28T22:54:00","date_gmt":"2023-11-28T14:54:00","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12454"},"modified":"2023-11-29T22:45:40","modified_gmt":"2023-11-29T14:45:40","slug":"javascript-zhong-shen-me-shinan-yi-ji-ru-he-jian-c","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-shen-me-shinan-yi-ji-ru-he-jian-c\/","title":{"rendered":"JavaScript \u4e2d\u4ec0\u4e48\u662f NaN\uff1f\u4ee5\u53ca\u5982\u4f55\u68c0\u67e5\u503c\u662f\u5426\u4e3a NaN\uff1f"},"content":{"rendered":"<p><code>NaN<\/code> \u662f JavaScript \u4e2d\u7684\u7279\u6b8a\u503c\uff0c\u8868\u793a\u201c\u4e0d\u662f\u4e00\u4e2a\u6570\u5b57\u201d\uff08Not-a-Number\uff09\u3002\u5b83\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u6570\u503c\u7c7b\u578b\uff0c\u7528\u4e8e\u8868\u793a\u4e0d\u80fd\u4ea7\u751f\u6709\u6548\u6570\u5b57\u7ed3\u679c\u7684\u64cd\u4f5c\u6216\u503c\u3002\u4f8b\u5982\uff0c\u5c06\u975e\u6570\u5b57\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\u30010 \u9664\u4ee5 0 \u7b49\u64cd\u4f5c\u4f1a\u8fd4\u56de <code>NaN<\/code>\u3002<\/p>\n<p>\u8981\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u4e3a <code>NaN<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>isNaN()<\/code> \u51fd\u6570\u3002\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\uff0c<code>isNaN()<\/code> \u5728\u5224\u65ad\u503c\u662f\u5426\u662f <code>NaN<\/code> \u65f6\u4f1a\u5c1d\u8bd5\u5148\u5c06\u503c\u8f6c\u6362\u4e3a\u6570\u5b57\uff0c\u5982\u679c\u80fd\u8f6c\u6362\u4e3a\u6570\u5b57\uff0c\u4f1a\u8fd4\u56de <code>false<\/code>\uff0c\u5426\u5219\u8fd4\u56de <code>true<\/code>\u3002\u6709\u65f6\u5019\u8fd9\u4e2a\u884c\u4e3a\u53ef\u80fd\u4e0d\u7b26\u5408\u9884\u671f\uff0c\u6bd4\u5982\u5bf9\u4e8e\u7a7a\u5b57\u7b26\u4e32\u6216\u5176\u4ed6\u4e0d\u80fd\u8f6c\u6362\u4e3a\u6570\u5b57\u7684\u975e <code>NaN<\/code> \u503c\u4e5f\u4f1a\u8fd4\u56de <code>true<\/code>\u3002<\/p>\n<pre><code class=\"language-javascript\">const value = 10 \/ 'abc'; \/\/ \u5c06\u975e\u6570\u5b57\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\uff0c\u7ed3\u679c\u4e3a NaN\n\n\/\/ \u68c0\u67e5\u503c\u662f\u5426\u4e3a NaN\nif (isNaN(value)) {\n  console.log('The value is NaN.');\n} else {\n  console.log('The value is a number.');\n}\n<\/code><\/pre>\n<p>\u53e6\u4e00\u4e2a\u66f4\u53ef\u9760\u7684\u65b9\u5f0f\u662f\u4f7f\u7528 <code>Number.isNaN()<\/code> \u65b9\u6cd5\uff0c\u5b83\u4e0d\u4f1a\u5c1d\u8bd5\u5c06\u53c2\u6570\u8f6c\u6362\u4e3a\u6570\u5b57\uff0c\u53ea\u6709\u5728\u53c2\u6570\u4e25\u683c\u7b49\u4e8e <code>NaN<\/code> \u65f6\u624d\u4f1a\u8fd4\u56de <code>true<\/code>\u3002<\/p>\n<pre><code class=\"language-javascript\">const value = 10 \/ 'abc'; \/\/ \u5c06\u975e\u6570\u5b57\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\uff0c\u7ed3\u679c\u4e3a NaN\n\n\/\/ \u68c0\u67e5\u503c\u662f\u5426\u4e3a NaN\nif (Number.isNaN(value)) {\n  console.log('The value is NaN.');\n} else {\n  console.log('The value is a number.');\n}\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u66f4\u52a0\u7cbe\u786e\u5730\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u662f <code>NaN<\/code>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NaN \u662f JavaScript \u4e2d\u7684\u7279\u6b8a\u503c\uff0c\u8868\u793a\u201c\u4e0d\u662f\u4e00\u4e2a\u6570\u5b57\u201d\uff08Not-a-Number\uff09\u3002\u5b83\u662f\u4e00\u4e2a\u7279\u6b8a\u7684 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-12454","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12454","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\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12454"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12454\/revisions"}],"predecessor-version":[{"id":13561,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12454\/revisions\/13561"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12454"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}