js随机验证码

随机验证码：
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            *{margin:0;padding:0;}
            #auth_code{width:200px; 
                       height:100px; 
                       border:1px solid #ccc;
                       margin:200px auto 0;
                       text-align:center;
                       line-height:100px;
                       font-size:50px;
                       letter-spacing:5px;
                       cursor:pointer;}
        </style>
    </head>
    <body>
        <div id="auth_code" onclick="auth_code()"></div>
        <script>
            //验证码内需要字符个数
            var num=4;
            //点击更换验证码
            function auth_code(){
                //获取id为box元素
                var box=$("auth_code");
                //随机改变字符
                box.innerHTML=randstr();
                //获取box里span元素，并换颜色
                for(var i=0;i<num;i++){
                    var span=box.getElementsByTagName("span")[i];
                    span.style.color=randcolor16();
                }    
            }
            //获取元素通过ID-----------函数-----------
            function $(IdName){
                return document.getElementById(IdName);                
            }
            //字符随机选取---------------函数------------
            function randstr(){
                var all = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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'];
                var words="";
                for(var i=0;i<num;i++){
                    var word=all[parseInt(Math.random()*all.length)];
                    words+="<span>"+word+"</span>";
                }
                return words;
            }
            //随机颜色rgb------------函数----------------
            function randcolor(){
                var color= parseInt(Math.random()*255);
                var color1= parseInt(Math.random()*255);
                var color2= parseInt(Math.random()*255);
                return "rgb("+color+","+color1+","+color2+")"                    
            }
            //随机颜色十六进制-----------函数------------------
            function randcolor16(){
                var color="#";
                var color16num = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f']
                for(var i=1; i<=6;i++){
                    color+=color16num[parseInt(Math.random()*color16num.length)]
                }
                return color;
            }
            window.onload = auth_code();
        </script>
    </body>
</html>
猜你喜欢
