运算验证码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<style type="text/css">
.code
{
font-family: Arial;
font-style: italic;
color: Red;
border: 0;
padding: 2px 3px;
letter-spacing: 3px;
font-weight: bolder;
}
.unchanged
{
border: 0;
}
</style>
<script type="text/javascript" src="jquery-1.11.2.min.js"></script>
<script language="javascript" type="text/javascript">
var code; //在全局 定义验证码
var code2; //在全局 定义验证码
function createCode() {
code = "";
var checkCode = document.getElementById("checkCode");
function RndNum(n) {
var rnd = "";
for (var i = 0; i < n; i++)
rnd += Math.floor(Math.random() * 10);
return rnd;
}
var num = RndNum(2);
var num2 = RndNum(2);
code = num + "+" + num2 + "=";
code2 = parseInt(num) + parseInt(num2)
if (checkCode) {
checkCode.className = "code";
checkCode.value = code;
}
}
</script>
<body onload="createCode() ">
<form action="#">
<input type="text" id="input1" />
<input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px;background-color: gainsboro;"/><br />
<input type="submit" value="验证" id="validate"/>
</form>
</body>
</html>
<script type="text/javascript">
$(document).ready(function () {
$("#validate").click(function () {
var inputCode = document.getElementById("input1").value;
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("验证码输入正确！");
}
});
})
</script>
