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(13223342.9269).toFixed(2)=13223342.93;
(13223342.9269).toLocaleString()=13,223,342.93;
formatNum(13223342.9269)=13,223,342.9269;
delFormat(13,223,342.9269)=13223342.9269;
//È¥µô¶ººÅ
function delFormat(str){
  return str.replace(/,/g,"");
 }
  
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function formatNum(num)
{   
 if(!/^(\+|-)?(\d+)(\.\d+)?$/.test(num)){alert("wrong!"); return num;}
 var a = RegExp.$1, b = RegExp.$2, c = RegExp.$3;
 var re = new RegExp().compile("(\\d)(\\d{3})(,|$)");
 while(re.test(b)) b = b.replace(re, "$1,$2$3");
 return a +""+ b +""+ c;
}
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Number.prototype.format = function(){ //¸øjavascriptÀïËùÓеÄÊý×ÖÌí¼ÓÒ»¸öÔ­Ðͺ¯Êý£¬½Ðformat()
    if(!/^(\+|-)?(\d+)(\.\d+)?$/.test(this)) { //ÓÃÕýÔò±í´ïʽ¸øÊ¹Óøú¯ÊýµÄÊý×Ö×ö²âÊÔ£¬Èç¹û²»·ûºÏ[Õý¸º£¨¿ÉÓпÉÎÞ£©]¡¢[Êý×Ö£¨Öظ´Ò»´ÎÒÔÉÏ£©]¡¢[СÊýµã£¨¿ÉÓпÉÎÞ£©¡¢Êý×Ö£¨¿ÉÓпÉÎÞ£©]µÄÐÎʽ¡£
        return NaN; //·µ»ØNot A Number£¬ÖÕÖ¹¡£
    }
    var a = RegExp.$1, b = RegExp.$2, c = RegExp.$3; //·ñÔò½«¸ÕÕýÔò±í´ïʽÀïµÄ[]ÀïÈý²¿·Ö·ÅÈëa b cÈý¸ö±äÁ¿ÖÐ
    var re = new RegExp(); //¶¨ÒåÒ»¸öеÄÕýÔò±í´ïʽ±äÁ¿re
    re.compile("(\\d)(\\d{3})(,|$)"); //¸øreÄÚ²¿±àÒë[Ò»¸öÊý×Ö]¡¢[Èý¸öÊý×Ö]¡¢[,»òÕß½áÊø]µÄÕýÔò±í´ïʽ£¬ÕâÀïÎÒ¸ø¸ÄÁËÏ£¬Ô­°æÔÚre = new RegExp()ºóÃæÖ±½Ó¸ú.compileµÄд·¨Google ChromeµÄV8ÒýÇæÈϲ»³ö£¬FirefoxºÍÆÆIEµ¹¶¼Õý³££¬ËùÒÔ·Ö¿ªÐ´ÁË¡£Õâ¸öÎÊÌâ²éÁËÒ»ÍíÉϲŲé³öÀ´ - -#£¬¸ÃËÀ£¬ÊÀ½çÉÏΪɶҪÓÐÄÇô¶àä¯ÀÀÆ÷£¬ÕæÊÇØ²ÕÛÑôÊÙ°¡
    while(re.test(b))


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