uniqueID
是IE 私有的只读属性。
--------- 这个属性不是早早就固化在元素节点中,只是在我们第一次访问它时才开始为整个页面分配uniqueID
document对象的uniqueID与其他HTML的uniqueID属性的意义是不一样的。
每调用一次document.uniqueID,返回的值都是不一样的。
扩展阅读:
http://www.cnblogs.com/rubylouvre/archive/2010/03/14/1685532.html (来自司徒正美的“javascript uuid技术”)
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