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var str = ‘asdf‘ ; ?
var str1 = new String( ‘asdf‘ );
typeof str; //"string"
typeof str1; //"object"
Object.prototype.toString.cal(str); //"[object String]"
Object.prototype.toString.call(str1); //"[object String]"
综上所述,判断是否为字符串使用下边的最保险
Object.prototype.toString.call(str) === "[object String]"
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原文地址:http://my.oschina.net/u/1169535/blog/411096