JS人民币金额转大写程序

//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;
}