Web Front-endJS TutorialSharing an example of jQuery implementing a simple verification code functionSharing an example of jQuery implementing a simple verification code function
This article mainly shares with you a simple verification code function based on jquery. The code is simple and easy to understand, very good, and has reference value. Friends who need it can refer to it. I hope it can help everyone.
In the process of learning jQuery, I wrote a simple small example of a verification code and recorded it for future reference. The source code is as follows:
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
p{
background-color:blue;
width:200px;
height:100px;
font-size:35px;
}
</style>
<script src="../jquery-1.8.0.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
//我写的验证码
//验证码
var code;
function createCode(){
code = '';//首先默认code为空字符串
var codeLength = 4;//设置长度，这里看需求，我这里设置了4
var codeV = $("p");
//设置随机字符
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++){ //循环codeLength 我设置的4就是循环4次
var index = Math.floor(Math.random()*36); //设置随机数范围,这设置为0 ~ 36
code += random[index]; //字符串拼接 将每次随机的字符 进行拼接
}
codeV.text(code);//将拼接好的字符串赋值给展示的Value
}
//页面开始加载验证码
createCode();
//验证码p加载点击事件
$("p").bind('click',function() {
createCode();
});
//下面就是判断是否==的代码，无需解释
$("#b1").bind('click',function() {
var oValue = $("#in1").val().toUpperCase();
$("#l1").html("");
if(oValue ==""){
$("#l1").html("<font color='red'>请输入验证码</font>");
}else if(oValue != code){
$("#l1").html("<font color='red'>验证码不正确，请重新输入</font>");
oValue = "";
createCode();
}else{
$("#l1").html("<font color='blue'>验证码正确</font>");
}
});
});
</script>
</head>
<body>
<center>
<label >请输入验证码：</label><input type="text" id="in1" value="" placeholder="请输入验证码">
<button id="b1">点击验证</button>
<p></p><label id="l1"></label>
</center>
</body>
</html> Related recommendations:
How to load the verification code function that comes with Yii
JS verification code function explanation
Detailed explanation of examples of implementing verification code function using JavaScript
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