http://www.css88.com/archives/1824 专注前端开发，关注用户体验 Fri, 10 Feb 2012 10:58:56 +0000 hourly 1 http://wordpress.org/?v=3.3 http://www.css88.com/archives/1824/comment-page-1#comment-1343 扑街囝 Mon, 24 Aug 2009 08:21:54 +0000 http://www.css88.com/?p=1824#comment-1343 constructor不能判断没有定义的变量，例如 var x; alert(x.constructor);// x is undefined constructor不能判断没有定义的变量，例如
var x;
alert(x.constructor);// x is undefined

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