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     ·µ»Ø¶ÔÒ»¸öURI×Ö·û´®±àÂëÖеĽá¹û£¬±¾ÖÊÊÇUTF-8±àÂë
     eg:
     var urlStr = encodeURI('http://fanli.qq.com/index.html?a=ddd&msg=Öйú');
     alert(urlStr);
2, decodeURI·½·¨
    ¶ÔURI±àÂë½øÐнâÂë³Â×î³õʼµÄ×Ö·û´®²¢·µ»Ø
3£¬parseInt·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)
     ×¢Ò⣺ÅжÏÒ»¸öÊýÊÇ·ñÊÇNaN²»ÄÜÕâÑù£¬if(xx == NaN)£¬Ö»ÄÜÓø÷½·¨½øÐÐÅжϣ¬È磺
     alert(NaN == NaN);  //·Ç³£Ææ¹Ö£¬ÕâÀïµÄ½á¹ûÊÇfalse
     alert(isNaN(NaN));   //true
6£¬escape·½·¨
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7£¬unescape·½·¨
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