JS实现将人民币金额转换为大写的示例代码

//人民币金额转大写程序 JavaScript版     
//CopyRight Bardo QI     function numToCny(num){     
    var capUnit = ['万','亿','万','圆',''];     
    var capDigit = { 2:['角','分',''], 4:['仟','佰','拾','']};     
    var capNum=['零','壹','贰','叁','肆','伍','陆','柒','捌','玖'];     
    if (((num.toString()).indexOf('.') > 16)||(isNaN(num)))      
        return '';     
    num = (Math.round(num*100)/100).toString();     
    num =((Math.pow(10,19-num.length)).toString()).substring(1)+num;     
    var i,ret,j,nodeNum,k,subret,len,subChr,CurChr=[];     
    for (i=0,ret='';i<5;i++,j=i*4+Math.floor(i/4)){     
        nodeNum=num.substring(j,j+4);     
        for(k=0,subret='',len=nodeNum.length;((k<len) && (parseInt(nodeNum.substring(k))!=0));k++){     
            CurChr[k%2] = capNum[nodeNum.charAt(k)]+((nodeNum.charAt(k)==0)?'':capDigit[len][k]);     
            if (!((CurChr[0]==CurChr[1]) && (CurChr[0]==capNum[0])))     
                if(!((CurChr[k%2] == capNum[0]) && (subret=='') && (ret=='')))     
                    subret += CurChr[k%2];     
        }     
        subChr = subret + ((subret=='')?'':capUnit[i]);     
        if(!((subChr == capNum[0]) && (ret=='')))     
            ret += subChr;     
    }     
    ret=(ret=='')? capNum[0]+capUnit[3]: ret;       
    return ret;     
}