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eg:
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2, decodeURI·½·¨
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eg:
parseInt('123abc',10); //½á¹ûΪ123
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(NaN == NaN); //·Ç³£Ææ¹Ö£¬ÕâÀïµÄ½á¹ûÊÇfalse
alert(isNaN(NaN)); //true
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