“`”<\/p>\n
1\uff09\u8fd4\u56de\u6570\u636e\u7c7b\u578b
\nundefined
\nstring
\nboolean
\nnumber
\nsymbol(ES6)
\nObject
\nFunction<\/p>\n
2\uff09\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362
\nNumber(\u53c2\u6570) \u628a\u4efb\u4f55\u7c7b\u578b\u8f6c\u6362\u6210\u6570\u503c\u7c7b\u578b\u3002
\nparseInt(\u53c2\u65701\uff0c\u53c2\u65702) \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6574\u6570
\nparseFloat()\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6d6e\u70b9\u6570\u5b57
\nstring(\u53c2\u6570)\uff1a\u53ef\u4ee5\u5c06\u4efb\u4f55\u7c7b\u578b\u8f6c\u6362\u6210\u5b57\u7b26\u4e32
\nBoolean() \u53ef\u4ee5\u5c06\u4efb\u4f55\u7c7b\u578b\u7684\u503c\u8f6c\u6362\u6210\u5e03\u5c14\u503c\u3002<\/p>\n
3\uff09\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362
\n1.\u56db\u5219\u8fd0\u7b97
\n\u52a0\u6cd5\u8fd0\u7b97\u7b26+\u662f\u53cc\u76ee\u8fd0\u7b97\u7b26\uff0c\u53ea\u8981\u5176\u4e2d\u4e00\u4e2a\u662fString\u7c7b\u578b\uff0c\u8868\u8fbe\u5f0f\u7684\u503c\u4fbf\u662f\u4e00\u4e2aString\u3002
\n\u5bf9\u4e8e\u5176\u4ed6\u7684\u56db\u5219\u8fd0\u7b97\uff0c\u53ea\u6709\u5176\u4e2d\u4e00\u4e2a\u662fNumber\u7c7b\u578b\uff0c\u8868\u8fbe\u5f0f\u7684\u503c\u4fbf\u662f\u4e00\u4e2aNumber\u3002
\n\u5bf9\u4e8e\u975e\u6cd5\u5b57\u7b26\u7684\u60c5\u51b5\u901a\u5e38\u4f1a\u8fd4\u56deNaN\uff1a
\n\u20181\u2019 * \u2018a\u2019 \/\/ => NaN\uff0c\u8fd9\u662f\u56e0\u4e3aparseInt(a)\u503c\u4e3aNaN\uff0c1 * NaN \u8fd8\u662f NaN<\/p>\n
2.\u5224\u65ad\u8bed\u53e5
\n\u5224\u65ad\u8bed\u53e5\u4e2d\u7684\u5224\u65ad\u6761\u4ef6\u9700\u8981\u662fBoolean\u7c7b\u578b\uff0c\u6240\u4ee5\u6761\u4ef6\u8868\u8fbe\u5f0f\u4f1a\u88ab\u9690\u5f0f\u8f6c\u6362\u4e3aBoolean\u3002 \u5176\u8f6c\u6362\u89c4\u5219\u540cBoolean\u7684\u6784\u9020\u51fd\u6570\u3002\u6bd4\u5982\uff1a
\nvar obj = {};if(obj){
\nwhile(obj);}<\/p>\n
3.Native\u4ee3\u7801\u8c03\u7528
\nJavaScript\u5bbf\u4e3b\u73af\u5883\u90fd\u4f1a\u63d0\u4f9b\u5927\u91cf\u7684\u5bf9\u8c61\uff0c\u5b83\u4eec\u5f80\u5f80\u4e0d\u5c11\u901a\u8fc7JavaScript\u6765\u5b9e\u73b0\u7684\u3002 JavaScript\u7ed9\u8fd9\u4e9b\u51fd\u6570\u4f20\u5165\u7684\u53c2\u6570\u4e5f\u4f1a\u8fdb\u884c\u9690\u5f0f\u8f6c\u6362\u3002\u4f8b\u5982BOM\u63d0\u4f9b\u7684alert\u65b9\u6cd5\u63a5\u53d7String\u7c7b\u578b\u7684\u53c2\u6570\uff1a
\nalert({a: 1}); \/\/ => [object Object]<\/p>\n
\u00a0<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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