数字金额转繁体中文大写字符串

function intToChinese ( str ) {    str = str+'';    var len = str.length-1;    var idxs = ['','十','百','千','万','十','百','千','亿','十','百','千','万','十','百','千','亿'];    var num = ['零','壹','贰','叁','肆','伍','陆','柒','捌','玖'];    return str.replace(/([1-9]|0+)/g,function( $, $1, idx, full) {        var pos = 0;        if( $1[0] != '0' ){            pos = len-idx;            if( idx == 0 && $1[0] == 1 && idxs[len-idx] == '十'){                return idxs[len-idx];            }            return num[$1[0]] + idxs[len-idx];        } else {            var left = len - idx;            var right = len - idx + $1.length;            if( Math.floor(right/4) - Math.floor(left/4) > 0 ){                pos = left - left%4;            }            if( pos ){                return idxs[pos] + num[$1[0]];            } else if( idx + $1.length >= len ){                return '';            }else {                return num[$1[0]]            }        }    });}