js 实现随机验证码

来源：互联网发布：zigbee协议栈网络管理编辑：程序博客网时间：2024/05/19 12:15
<html ><head>    <meta charset="utf-8"><title>JS生成验证码</title><style type="text/css">.code {background-image: url(code.jpg);font-family: Arial;font-style: italic;color: Red;border: 0;padding: 2px 3px;letter-spacing: 3px;font-weight: bolder;}.unchanged {border: 0;}</style><script language="javascript" type="text/javascript">  var code; //在全局 定义验证码   function createCode() {    code = "";    code2= "";    var codeLength = 6;//验证码的长度       var checkCode = document.getElementById("checkCode");    var selectChar = new Array(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');//所有候选组成验证码的字符，当然也可以用中文的        for (var i = 0; i < codeLength; i++) {        var charIndex = Math.floor(Math.random() * 36);        code += selectChar[charIndex];        code2 = code.toLowerCase();    }    //alert(code);    if (checkCode) {        checkCode.className = "code";        checkCode.value = code;    }} function validate() {    var inputCode = document.getElementById("input1").value;    inputCode = inputCode.toLowerCase();    if (inputCode.length <= 0) {        alert("请输入验证码！");    } else if (inputCode != code2) {        alert("验证码输入错误！");    createCode();//刷新验证码       } else {    alert("^-^ OK");    }}</script></head><body onload="createCode()"><form action="#">    <input type="text" id="input1" /> <input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px" /><br />    <input id="Button1" onclick="validate();" type="button" value="确定" /></form></body></html>
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