javascript tofixed四舍五入的方法

javascript tofixed四舍五入的方法

Number.prototype.toFixed = function(d) {
    var s = this + "";
    if (!d) d = 0;
    if (s.indexOf(".") == -1) s += ".";
    s += new Array(d + 1).join("0");
    if (new RegExp("^(-|\\+)?(\\d+(\\.\\d{0," + (d + 1) + "})?)\\d*$").test(s)) {
        var s = "0" + RegExp.$2,
            pm = RegExp.$1,
            a = RegExp.$3.length,
            b = true;
        if (a == d + 2) {
            a = s.match(/\d/g);
            if (parseInt(a[a.length - 1]) > 4) {
                for (var i = a.length - 2; i >= 0; i--) {
                    a[i] = parseInt(a[i]) + 1;
                    if (a[i] == 10) {
                        a[i] = 0;
                        b = i != 1;
                    } else break;
                }
            }
            s = a.join("").replace(new RegExp("(\\d+)(\\d{" + d + "})\\d$"), "$1.$2");
        }
        if (b) s = s.substr(1);
        return (pm + s).replace(/\.$/, "");
    }
    return this + "";
};

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