JS 随机生成字母加数字

 //节点Cored 生成规则
    function getRanNum() {
        var result = [];
        for (var i = 0; i < 3; i++) {
            var ranNum = Math.ceil(Math.random() * 25);
            result.push(String.fromCharCode(65 + ranNum));
        }
        var num = RndNum(2);
        return result.join('') + num;
    }

    function RndNum(n) {
        var rnd = "";
        for (var i = 0; i < n; i++)
            rnd += Math.floor(Math.random() * 10);
        return rnd;
    }