Function:

1. refresh code verification can be achieved by refreshing the page and click on an area for verification;

2. To achieve the operation of the conventional codes. If you do not enter this code will tell you to let you enter; if you enter the wrong will remind you; no mistake when you enter the correct celebrate Oh!

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>验证码</title>
    <style>
        .code {
            width: 120px;
            height: 50px;
            background-color: pink;
            display: inline-block;
            text-align: center;
            line-height: 50px;
            letter-spacing: 10px;
            /*字体倾斜*/
            font-style: italic;
            /*鼠标图标变为小手图标*/
            cursor: pointer;
        }

        a {
            text-decoration: none;
            color: #baff4d;
        }

        a:hover {
            text-decoration: underline;
        }

        input {
            height: 30px;
            /*设置圆角框*/
            border-radius: 5px;
            border: 1px solid grey;
        }

        button {
            height: 30px;
            background-color: #baff4d;
            border: 1px solid grey;
            border-radius: 5px;
        }
    </style>
</head>
<body onload="createCode()">          <!--onload当页面或者图像加载完之后立即执行-->
<div class="code" onclick="createCode()"></div>
<a href="#" onclick="createCode()">看不清换一张</a><br>
<input type="text" placeholder="请输入验证码">
<button onclick="checkCode()">确定</button>

<script>
    // 生成验证码的函数
    var code;
    function createCode() {
        code = "";            //验证码的初始值
        var codeLength = 4;   //验证码的长度
        // 验证码的组成成分
        var codeChars = 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', '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++){
            // 获取的四个随机数：下标
            var charNum = Math.floor(Math.random()*62);
            // 验证码
            code += codeChars[charNum];
        }
        document.getElementsByClassName("code")[0].innerText = code;
    }
    // 验证验证码的函数
    function checkCode() {
        // 获取输入的值
        var inputCode = document.getElementsByTagName("input")[0].value;
        // 判断验证码是否输入正确
        if (inputCode.length<=0){
            alert("请输入验证码！");
        }else if(inputCode.toUpperCase() != code.toUpperCase()){
            alert("验证码输入有误！");
            // 更新验证码
            createCode();
            // 清空输入框
            document.getElementsByTagName("input")[0].value = "";
        }else{
            alert("祝贺你：没有错误哦！")
        }
    }

</script>

</body>
</html>

Miserly rm-

Published 65 original articles · won praise 50 · views 3571

Private letter concerns

Simple implementation of web code

Function:

1. refresh code verification can be achieved by refreshing the page and click on an area for verification;

2. To achieve the operation of the conventional codes. If you do not enter this code will tell you to let you enter; if you enter the wrong will remind you; no mistake when you enter the correct celebrate Oh!

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