生成图片验证码并验证
一个简单的前端JS生成验证码并验证功能
<html>
<head>
<title>验证码</title>
<style type="text/css">
#code
{
font-style:italic;
font-weight:bold;
border:0;
letter-spacing:2px;
color: #4567ff;
background-color: #e4e4e4;
}
</style>
</head>
<body>
<div>
<form action="***" method='POST' id='loginForm'>
<input type = "text" id = "inputCode"/>
<input type = "button" id="code" οnclick="createCode()"/>
<button type="button" id="submitBtn">登录</button>
</form>
</div>
</body>
</html>
$(function(){ createCode(); var code; function createCode() { code = ""; var codeLength = 4; var checkCode = document.getElementById("code"); var random = 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'); for(var i = 0; i < codeLength; i++) { var index = Math.floor(Math.random()*36); code += random[index]; } checkCode.value = code; } $("#submitBtn").click(function () { var inputCode = $("#inputCode").val().toUpperCase(); if(inputCode.length <= 0) { alert("请输入验证码"); } else if(inputCode != code ) { alert("验证码输入错误"); createCode(); $("#inputCode").val("") } else { $("#loginForm").submit(); } }); })