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index2.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS实现生成随机验证码并验证功能</title>
<style>
*{
margin: 0;
padding: 0;
}
#next{
height: 30px;
box-sizing: border-box;
vertical-align: middle;
text-indent: 1em;
}
#code{
display: inline-block;
width: 80px;
height: 30px;
background: #aaa;
text-align: center;
line-height: 30px;
color: #fff;
text-decoration: none;
letter-spacing: 7px;
padding-left: 7px;
vertical-align: middle;
font-weight: bold;
}
#btn{
width: 60px;
height: 30px;
outline: 0;
border: #153021;
background: #adcccc;
color: #fff;
border-radius: 5px;
}
</style>
</head>
<body onload="createCode()">
<div class="wrap">
<input type="text" id="text" placeholder="请输入验证码">
<a href="javascript:void(0);" id="code" onclick="createCode(this)"></a>
<input type="button" id="btn" value="验证" onclick="validate()">
</div>
<script>
var checkCode=document.getElementById("code");
var btn=document.getElementById("btn");
var code="";
function createCode(){
code="";
var codeLength=4;
var random=[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.innerHTML=code;
}
function validate(){
var input=document.getElementById("text").value.toUpperCase();
if(input==0){
alert('请输入验证码');
}else if(input!=code){
alert('验证码不正确,请重新输入');
input=' ';
createCode();
}else{
}
}
</script>
</body>
</html>