JS 阿拉伯数字转中文简体

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', '一', '二', '三', '四', '五', '六', '七', '八', '九'];    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]]            }        }    });}