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2, decodeURI·½·¨
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4£¬parseFloat·½·¨£ºÈôת»»Ê§°Ü£¬Ôò·µ»ØNaN
5£¬isNaN·½·¨  ---ÓµÓмì²âparseIntºÍparseFloat·½·¨µÄ·µ»ØÖµÊÇ·ñÊÇNaN (Not a Number)
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     alert(isNaN(NaN));   //true
6£¬escape·½·¨
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