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typeof()函数会返回一个字符串(string),表示变量的类型
console.log(typeof 1);//number
console.log(typeof "1");//string
console.log(typeof [1,2]);//object
console.log(typeof function(){alert(1);});//function
console.log(typeof false);//boolean
console.log(typeof {a:1,b:2});//object
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原文地址:http://www.cnblogs.com/xyfun/p/5745537.html