jQuery实现验证码功能
效果图：
代码如下：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
#code{
width:80px;
height:30px;
font-size:20px;
font-family:Arial;
font-style:italic;
font-weight:bold;
border:0;
letter-spacing:2px;
color:blue;
}
</style>
</head>
<body>
<div>
<input type = "text" id = "input"/>
<input type = "button" id="code" />
<input type = "button" value = "验证" id="check"/>
</div>
<script type="text/javascript" src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
<script type="text/javascript">
function change(){
code=$("#code");
// 验证码组成库
var arrays=new Array(
'1','2','3','4','5','6','7','8','9','0',
'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'
);
codes='';// 重新初始化验证码
for(var i = 0; i<4; i++){
// 随机获取一个数组的下标
var r = parseInt(Math.random()*arrays.length);
codes += arrays[r];
}
// 验证码添加到input里
code.val(codes);
}
change();
code.click(change);
//单击验证
$("#check").click(function(){
var inputCode = $("#input").val().toUpperCase(); //取得输入的验证码并转化为大写
console.log(inputCode);
if(inputCode.length == 0) { //若输入的验证码长度为0
alert("请输入验证码！"); //则弹出请输入验证码
}
else if(inputCode!=codes.toUpperCase()) { //若输入的验证码与产生的验证码不一致时
alert("验证码输入错误!请重新输入"); //则弹出验证码输入错误
change();//刷新验证码
$("#input").val("");//清空文本框
}else { //输入正确时
alert("正确"); //弹出^-^
}
});
</script>
</body>
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