js 字母+数字随机数获取

<html>
 <head>
    <title></title>
    <meta content="charset=utf-8" />
 </head> 
 <body>
   每条字母数：
  <input type="text" id="engNum" />
  <br /> 每条数字数：
  <input type="text" id="num" />
  <br /> 获取条数：
  <input type="text" id="ranNum" />
  <br /> 
  <input type="button" onclick="getRan()" value="获取" />
  <br /> 
  <div id="res"></div> 
  <script>
    var chars = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];

    function getEng(n) {
        var res = "";
        for (var i = 0; i < n; i++) {
            var id = Math.ceil(Math.random() * 51);
            res += chars[id];
        }
        return res;
    }

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

    function getRan() {
        var ran = "";
        var engNum = document.getElementById("engNum").value;
        var num = document.getElementById("num").value;
        var ranNum = document.getElementById("ranNum").value;
        document.getElementById("res").innerHTML = "";
        for (var i = 0; i < ranNum; i++) {
            ran = getEng(engNum) + RndNum(num);
            document.getElementById("res").innerHTML += ran + "<br/>";
        }
    }
  </script>  
 </body>
</html>
js 字母+数字随机数获取

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