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前端js 验证码
发布时间：2018-12-28 13:33:09
修改时间：2018-12-28 13:33:09
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>无标题页</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 = "";
var codeLength = 4;//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];
}
if(checkCode)
{
checkCode.className="code";
checkCode.value = code;
}
}
function validate ()
{
var inputCode = document.getElementById("input1").value;
if(inputCode.length <=0)
{
document.getElementById("yzm").innerText="请输入验证码！";
return false;
}
else if(inputCode != code )
{
document.getElementById("yzm").innerText="验证码输入错误！";
createCode();//刷新验证码
return false;
}
else
{
return true;
}
}
</script>
</head>
<body onload="createCode()">
<form action="#">
<input type="text" id="input1" placeholder="此项必填哦"/>
<input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px" />
<input id="Button1" onclick="console.log(validate())" type="button" value="确定" />
<label id="yzm" style="color:red;margin-left:15em"></label>
</form>
</body>
</html>
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