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html注册表单验证代码(JavaScript+html实现前端页面随机二维码验证)

时间:2022-01-19 00:13:21类别:编程学习

html注册表单验证代码

JavaScript+html实现前端页面随机二维码验证

分享炫酷的前端页面随机二维码验证,供大家参考,具体内容如下

直接上代码

  • <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
        <!--引入jquery的js -->
        <script type="text/javascript" src="../jquery/jquery.js"></script>
    </head>
    <style>
        .input-val {
            width: 200px;
            height: 32px;
            border: 1px solid #ddd;
            box-sizing: border-box;
        }
        #canvas {
            vertical-align: middle;
            box-sizing: border-box;
            border: 1px solid #ddd;
            cursor: pointer;
        }
        .btn {
            display: block;
            margin-top: 20px;
            height: 32px;
            width: 100px;
            font-size: 16px;
            color: #fff;
            background-color: #457adb;
            border: none;
            border-radius: 50px;
        }
    </style>
    <body>
    <li class="code">
        <input type="text" value="" placeholder="请输入验证码(不区分大小写)" class="input-val">
        <canvas id="canvas" width="100" height="30"></canvas>
        <button class="btn">提交</button>
    </li>
    </body>
    <script>
        $(function(){
            var show_num = [];
            draw(show_num);
    
            $("#canvas").on('click',function(){
                draw(show_num);
            })
            $(".btn").on('click',function(){
                var val = $(".input-val").val().toLowerCase();
                var num = show_num.join("");
                if(val==''){
                    alert('请输入验证码!');
                }else if(val == num){
                    alert('提交成功!');
                    $(".input-val").val('');
                    // draw(show_num);
    
                }else{
                    alert('验证码错误!请重新输入!');
                    $(".input-val").val('');
                    // draw(show_num);
                }
            })
        })
    
        //生成并渲染出验证码图形
        function draw(show_num) {
            var canvas_width=$('#canvas').width();
            var canvas_height=$('#canvas').height();
            var canvas = document.getElementById("canvas");//获取到canvas的对象,演员
            var context = canvas.getContext("2d");//获取到canvas画图的环境,演员表演的舞台
            canvas.width = canvas_width;
            canvas.height = canvas_height;
            var sCode = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
            var aCode = sCode.split(",");
            var aLength = aCode.length;//获取到数组的长度
    
            for (var i = 0; i < 4; i++) {  //这里的for循环可以控制验证码位数(如果想显示6位数,4改成6即可)
                var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
                // var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
                var deg = Math.random() - 0.5; //产生一个随机弧度
                var txt = aCode[j];//得到随机的一个内容
                show_num[i] = txt.toLowerCase();
                var x = 10 + i * 20;//文字在canvas上的x坐标
                var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
                context.font = "bold 23px 微软雅黑";
    
                context.translate(x, y);
                context.rotate(deg);
    
                context.fillStyle = randomColor();
                context.fillText(txt, 0, 0);
    
                context.rotate(-deg);
                context.translate(-x, -y);
            }
            for (var i = 0; i <= 5; i++) { //验证码上显示线条
                context.strokeStyle = randomColor();
                context.beginPath();
                context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
                context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
                context.stroke();
            }
            for (var i = 0; i <= 30; i++) { //验证码上显示小点
                context.strokeStyle = randomColor();
                context.beginPath();
                var x = Math.random() * canvas_width;
                var y = Math.random() * canvas_height;
                context.moveTo(x, y);
                context.lineTo(x + 1, y + 1);
                context.stroke();
            }
        }
    
        //得到随机的颜色值
        function randomColor() {
            var r = Math.floor(Math.random() * 256);
            var g = Math.floor(Math.random() * 256);
            var b = Math.floor(Math.random() * 256);
            return "rgb(" + r + "," + g + "," + b + ")";
        }
    
    </script>
    </html>
    
  • 效果如下

    html注册表单验证代码(JavaScript+html实现前端页面随机二维码验证)

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