js输入框对金额的匹配

/**
 * 金额格式化
 * @param s
 * @param n
 * @returns {String}
 */
function fmoney(s, n) {
    n = n > 0 && n <= 20 ? n : 2;
    s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
    var l = s.split(".")[0].split("").reverse(), r = s.split(".")[1];
    t = "";
    for (i = 0; i < l.length; i++) {
        t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
    }
    return t.split("").reverse().join("") + "." + r;
}
/**
 * 只能输入数字和小数点
 * @param obj
 */
function clearNoNum(obj) {
    obj.value = obj.value.replace(/[^\d.]/g, ""); //清除“数字”和“.”以外的字符
    obj.value = obj.value.replace(/^\./g, ""); //验证第一个字符是数字而不是.
    obj.value = obj.value.replace(/\.{2,}/g, "."); //只保留第一个. 清除多余的.
    obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d).*$/, '$1$2.$3'); //只能输入两个小数
    obj.value = obj.value.replace(".", "$#$").replace(/\./g, "").replace("$#$",".");
}

//匹配金额并且格式化
function matchMoney(obj) {
    var stmp = "";
    if (obj.value == stmp) {
        return;
    } else if (obj.value == ".") {
        obj.value = "";
        return;
    }
    var ms = obj.value.replace(/[^\d\.]/g, "").replace(/(\.\d{2}).+$/, "$1").replace(/^0+([1-9])/, "$1").replace(/^0+$/, "0");
    var txt = ms.split(".");
    while (/\d{4}(,|$)/.test(txt[0]))txt[0] = txt[0].replace(/(\d)(\d{3}(,|$))/, "$1,$2");
    obj.value = stmp = txt[0] + (txt.length > 1 ? "." + txt[1] : "");
}