{"id":68412,"date":"2019-09-23T13:51:42","date_gmt":"2019-09-23T05:51:42","guid":{"rendered":"http:\/\/www.xiaoyebailong.com\/?p=68412"},"modified":"2019-09-23T13:51:43","modified_gmt":"2019-09-23T05:51:43","slug":"js%e8%be%93%e5%87%ba%e5%86%85%e5%ae%b9%e4%b8%baobject-object","status":"publish","type":"post","link":"http:\/\/www.xiaoyebailong.com\/index.php\/2019\/09\/23\/68412.htm","title":{"rendered":"JS\u8f93\u51fa\u5185\u5bb9\u4e3a[object Object]"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u95ee\u9898\u63cf\u8ff0<\/h2>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u9879\u76ee\u4e2d\uff0c\u6b32\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u53d8\u91cf<code>res<\/code>\uff08\u81ea\u5b9a\u4e49\u5bf9\u8c61\uff09\u67e5\u770b\u6570\u636e\uff0c\u4ee3\u7801\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code\">console.log('res:' + res);\n<\/pre>\n\n\n\n<p>\u4f46\u63a7\u5236\u53f0\u663e\u793a\u7ed3\u679c\u4e3a<code>res: [object 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class=\"wp-block-list\"><li>\u9664\u4e86<code>null<\/code>\u548c<code>undefined<\/code>\u4e4b\u5916\uff0c\u5176\u4ed6\u7684\u7c7b\u578b(\u6570\u503c\u3001\u5e03\u5c14\u3001\u5b57\u7b26\u4e32\u3001\u5bf9\u8c61)\u90fd\u6709<code>toString()<\/code>\u65b9\u6cd5\uff0c\u5b83\u8fd4\u56de\u76f8\u5e94\u503c\u7684\u5b57\u7b26\u4e32\u8868\u73b0(\u5e76\u4e0d\u4fee\u6539\u539f\u53d8\u91cf)\u3002<\/li><li>\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a<code>toString()<\/code>\u65b9\u6cd5\u3002<\/li><li>\u5f53\u8be5\u5bf9\u8c61\u88ab\u8868\u793a\u4e3a\u4e00\u4e2a\u6587\u672c\u503c\u65f6\uff0c\u6216\u8005\u4e00\u4e2a\u5bf9\u8c61\u4ee5\u9884\u671f\u7684\u5b57\u7b26\u4e32\u65b9\u5f0f\u5f15\u7528\u65f6\u81ea\u52a8\u8c03\u7528\u3002<\/li><li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c<code>toString()<\/code>\u65b9\u6cd5\u88ab\u6bcf\u4e2a<code>Object<\/code>\u5bf9\u8c61\u7ee7\u627f\u3002\u5982\u679c\u6b64\u65b9\u6cd5\u5728\u81ea\u5b9a\u4e49\u5bf9\u8c61\u4e2d\u672a\u88ab\u8986\u76d6\uff0c<code>toString()<\/code>\u8fd4\u56de 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class=\"wp-block-heading\">Tips\uff1a\u4e00\u4e9b\u8865\u5145<\/h2>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code\">(1).toString()      \/\/ \"1\"\n\n[1,2].toString()    \/\/ \"1, 2\"\n\n({}).toString()     \/\/ [object Object]\n\ntrue.toString()     \/\/ \"true\"\n\nnull.toString()     \/\/ Uncaught TypeError: Cannot read property 'toString' of null\n\nundefined.toString()  \/\/ Uncaught TypeError: Cannot read property 'toString' of null\n<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u7b2c3\u884c\uff0c\u4e0d\u80fd\u76f4\u63a5\u5199\u6210<code>{}.toString()<\/code>\u662f\u56e0\u4e3a\uff1a<code>{}<\/code>\u4f1a\u88ab\u5f53\u6210<strong>\u4ee3\u7801\u5757<\/strong>\u800c\u4e0d\u662f\u7a7a\u5bf9\u8c61<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u95ee\u9898\u63cf\u8ff0 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