{"id":254,"date":"2020-02-04T20:11:58","date_gmt":"2020-02-04T12:11:58","guid":{"rendered":"https:\/\/blog.cqdefxxx.com\/?p=254"},"modified":"2020-02-04T20:11:58","modified_gmt":"2020-02-04T12:11:58","slug":"254","status":"publish","type":"post","link":"https:\/\/blog.viter.top\/index.php\/2020\/02\/04\/254\/","title":{"rendered":"\u8f6c\u6362\u4e3aNumber"},"content":{"rendered":"<pre class=\"pure-highlightjs\"><code class=\"\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n\t&lt;head&gt;\n\t\t&lt;meta charset=\"UTF-8\"&gt;\n\t\t&lt;title&gt;&lt;\/title&gt;\n\t\t&lt;script type=\"text\/javascript\"&gt;\n\t\t\n\t\t\t\/*\n\t\t\t * \u5c06\u5176\u4ed6\u7684\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3aNumber\n\t\t\t * \t \u8f6c\u6362\u65b9\u5f0f\u4e00\uff1a\n\t\t\t * \t\t\u4f7f\u7528Number()\u51fd\u6570\n\t\t\t * \t\t\t- \u5b57\u7b26\u4e32 --&gt; \u6570\u5b57\n\t\t\t * \t\t\t\t1.\u5982\u679c\u662f\u7eaf\u6570\u5b57\u7684\u5b57\u7b26\u4e32\uff0c\u5219\u76f4\u63a5\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u5b57\n\t\t\t * \t\t\t\t2.\u5982\u679c\u5b57\u7b26\u4e32\u4e2d\u6709\u975e\u6570\u5b57\u7684\u5185\u5bb9\uff0c\u5219\u8f6c\u6362\u4e3aNaN\n\t\t\t * \t\t\t\t3.\u5982\u679c\u5b57\u7b26\u4e32\u662f\u4e00\u4e2a\u7a7a\u4e32\u6216\u8005\u662f\u4e00\u4e2a\u5168\u662f\u7a7a\u683c\u7684\u5b57\u7b26\u4e32\uff0c\u5219\u8f6c\u6362\u4e3a0\n\t\t\t * \t\t\t- \u5e03\u5c14 --&gt; \u6570\u5b57\n\t\t\t * \t\t\t\ttrue \u8f6c\u6210 1\n\t\t\t * \t\t\t\tfalse \u8f6c\u6210 0\n\t\t\t * \n\t\t\t * \t\t\t- null --&gt; \u6570\u5b57     0\n\t\t\t * \n\t\t\t * \t\t\t- undefined --&gt; \u6570\u5b57 NaN\n\t\t\t * \n\t\t\t * \u8f6c\u6362\u65b9\u5f0f\u4e8c\uff1a\n\t\t\t * \t\t- \u8fd9\u79cd\u65b9\u5f0f\u4e13\u95e8\u7528\u6765\u5bf9\u4ed8\u5b57\u7b26\u4e32\n\t\t\t * \t\t- parseInt() \u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e00\u4e2a\u6574\u6570\n\t\t\t * \t\t- parseFloat() \u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e00\u4e2a\u6d6e\u70b9\u6570\n\t\t\t *\/\n\t\t\t\n\t\t\tvar a = \"123\";\n\t\t\t\n\t\t\t\/\/\u8c03\u7528Number()\u51fd\u6570\u6765\u5c06a\u8f6c\u6362\u4e3aNumber\u7c7b\u578b\n\t\t\ta = Number(a);\n\t\t\t\n\t\t\ta = false;\n\t\t\ta = Number(a);\n\t\t\t\n\t\t\ta = null;\n\t\t\ta = Number(a);\n\t\t\t\n\t\t\ta = undefined;\n\t\t\ta = Number(a);\n\t\t\t\n\t\t\ta = \"123567a567px\";\n\t\t\t\/\/\u8c03\u7528parseInt()\u51fd\u6570\u5c06a\u8f6c\u6362\u4e3aNumber\n\t\t\t\/*\n\t\t\t * parseInt()\u53ef\u4ee5\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7684\u6709\u6548\u7684\u6574\u6570\u5185\u5bb9\u53bb\u51fa\u6765\uff0c\n\t\t\t * \t\u7136\u540e\u8f6c\u6362\u4e3aNumber\n\t\t\t *\/\n\t\t\ta = parseInt(a);\n\t\t\t\n\t\t\t\/*\n\t\t\t * parseFloat()\u4f5c\u7528\u548cparseInt()\u7c7b\u4f3c\uff0c\u4e0d\u540c\u7684\u662f\u5b83\u53ef\u4ee5\u83b7\u5f97\u6709\u6548\u7684\u5c0f\u6570\n\t\t\t *\/\n\t\t\ta = \"123.456.789px\";\n\t\t\ta = parseFloat(a);\n\t\t\t\n\t\t\t\/*\n\t\t\t * \u5982\u679c\u5bf9\u975eString\u4f7f\u7528parseInt()\u6216parseFloat()\n\t\t\t * \t\u5b83\u4f1a\u5148\u5c06\u5176\u8f6c\u6362\u4e3aString\u7136\u540e\u5728\u64cd\u4f5c\n\t\t\t *\/\n\t\t\ta = true;\n\t\t\ta = parseInt(a);\n\t\t\t\n\t\t\ta = 198.23;\n\t\t\ta = parseInt(a);\n\t\t\t\n\t\t\tconsole.log(typeof a);\n\t\t\tconsole.log(a);\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t&lt;\/script&gt;\n\t&lt;\/head&gt;\n\t&lt;body&gt;\n\t&lt;\/body&gt;\n&lt;\/html&gt;\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset= &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[4],"_links":{"self":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/posts\/254"}],"collection":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/comments?post=254"}],"version-history":[{"count":0,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/posts\/254\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/media?parent=254"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/categories?post=254"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/tags?post=254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}