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//注意：數(shù)字與字符的轉(zhuǎn)換會(huì)丟失多余的尾部0('123.010'<->123.01,'123.00'<->123)
var NumberFormat = {
    //按照每3位逗號(hào)分隔,字符串截子串法
    toCommaFormat: function(number){
        //如果是數(shù)字，則轉(zhuǎn)換為字符串
        if(typeof number == 'number'){
            number = String(number)
        }
        
        var pointIndex = number.lastIndexOf('.'); //獲取小數(shù)點(diǎn)的位置
        var hasDecimal = pointIndex != -1; //檢查是否包含小數(shù)點(diǎn)
        var numberInteger = hasDecimal ? number.substring(0, pointIndex) : number; //獲取數(shù)的整數(shù)部分
        var length = numberInteger.length;
        if(length > 3){
            var numberFormat = '';
            //從尾部往前截子串拼接
            for(var i= numberInteger.length; i> 0; i=i-3){
                //當(dāng)前子串+之前拼接好的子串(因：substring(0,1) == substring(-2,1)，故無(wú)需判斷i-3為負(fù)數(shù)的情況)
                numberFormat = numberInteger.substring(i-3,i) + (numberFormat==''?'':(','+numberFormat));
            }
            //整數(shù)部分+小數(shù)部分
            var numberDecimal = hasDecimal ? number.substring(pointIndex) : '';
            return numberFormat + numberDecimal;
        }else{
            //無(wú)需分隔，直接返回
            return number;
        }
    },
    //按照每3位逗號(hào)分隔,余數(shù)拼接法(缺點(diǎn)：有位數(shù)限制)
    toCommaFormat2: function(number){
        //如果是數(shù)字，則轉(zhuǎn)換為字符串
        if(typeof number == 'number'){
            number = String(number)
        }
        
        var pointIndex = number.lastIndexOf('.'); //獲取小數(shù)點(diǎn)的位置
        var hasDecimal = pointIndex != -1; //檢查是否包含小數(shù)點(diǎn)
        var numberInteger = hasDecimal ? number.substring(0, pointIndex) : number; //獲取數(shù)的整數(shù)部分
        var length = numberInteger.length;
        if(length > 3){
            var numberFormat = '';
            var remainder; //余數(shù)
            var quotient; //商
            while(true){ 
                quotient = Math.floor(Number(numberInteger)/1000); //商標(biāo)識(shí)還需不需要進(jìn)一步分隔
                remainder = Number(numberInteger)%1000; //余數(shù)即是分隔下來(lái)的子串
                numberFormat = String(remainder) + (numberFormat == ''?'':(','+numberFormat)); //當(dāng)前余數(shù)拼接之前的余數(shù)
                if(quotient == 0){
                    //商為0，計(jì)算完畢
                    break;
                }
                //商作為被除數(shù)，進(jìn)一步分隔
                numberInteger =  quotient; 
            }
            //整數(shù)部分+小數(shù)部分
            var numberDecimal = hasDecimal ? number.substring(pointIndex) : '';
            return numberFormat + numberDecimal;
        }else{
            //無(wú)需分隔，直接返回
            return number;
        }
        
    },
    //正則式替換，來(lái)自網(wǎng)友
    format_number:function(nStr ){
        nStr += '';  //數(shù)字轉(zhuǎn)換為字符 
        x = nStr.split('.');  //按照小數(shù)點(diǎn)分隔
        x1 = x[0];  //整數(shù)部分
        x2 = x.length > 1 ? '.' + x[1] : '';  //小數(shù)部分
        var rgx = /(\d+)(\d{3})/;  //正則式定義
        while (rgx.test(x1)) {  //正則式匹配
            x1 = x1.replace(rgx, '$1' + ',' + '$2');   //正則式替換
        }  
        return x1 + x2;  
    } 
    
};