数字转大写

toChineseNumerals.js

function toChineseNumerals(num) {
    if (!/^(\d+)(?:\.(\d{1,2}))?$/.test(num)) return "";
    var m = RegExp["$1"], n = RegExp["$2"];
    var a = ["", "萬", "億", "兆", "京", "垓", "秭", "穰", "沟", "涧", "正", "载"];
    var b = ["", "十", "百", "千"];
    var c = ["零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"];
    var d = ["角", "分"];
    return "（大写）" + m.split("").reverse().join("").match(/.{1,4}/g).map(function (item, index, array) {
        return b.reduceRight(function (prev, cur, idx, arr) {
            return prev += c[item[idx] >>> 0] + cur;
        }, "").replace(/(零.)+/g, "零").replace(/零+$/, "") + a[index];
    }).reverse().join("").replace(/^零+/, "") + "元" + (n ? n.split("").map(function (item, index, array) {
        return +item ? (c[+item] + d[index]) : "";
    }).join("") : "整");
}