验证码

Posted hyx626

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <style type="text/css">
        *{
            margin:0;
            padding: 0;
            box-sizing: border-box;
        }
        html{
            width: 100%;
            height: 100%;
            font-size: 16px;
        }
        body{
            width: 100%;
            height: 100%;
            -moz-user-select: none; /*火狐*/ /*禁止用户在页面选择文字*/
            -webkit-user-select: none; /*webkit浏览器*/
            -ms-user-select: none; /*IE10*/
            -khtml-user-select: none; /*早期浏览器*/
            user-select: none;
        }
        .code{
            width: 400px;
            margin:0 auto;
        }
        .input-val{
            width: 295px;
            background: #ffffff;
            height: 2.8rem;
            padding: 0 2%;
            border-radius: 5px;
            border: none;
            border: 1px solid rgba(0,0,0,.2);
            font-size: 1.0625rem;
        }
        #canvas{
            float:right;
            display: inline-block;
            border:1px solid #ccc;
            border-radius: 5px;
            cursor: pointer;
        }
        .btn{
            width: 100px;
            height: 40px;
            background: #f1f1f1;
            border: 1px solid #ccc;
            border-radius: 5px;
            margin: 20px auto 0;
            display: block;
            font-size: 1.2rem;
            color: #e22e1c;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div 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="43"></canvas>
        <button class="btn">提交</button>
    </div>
</body>
<script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
<script>

    $(function(){
       
        var codeValue = draw();
        console.log(codeValue)
        $("#canvas").on('click',function(){
           codeValue = draw();
        })
        $(".btn").on('click',function(){
            var val = $(".input-val").val().toLowerCase();
            var num = codeValue.join("");
            if(val==''){
                alert('请输入验证码!');
            }else if(val == num){
                alert('提交成功!');
                $(".input-val").val('');
               codeValue = draw();

            }else{
                alert('验证码错误!请重新输入!');
                $(".input-val").val('');
               codeValue= draw();
            }
        })
    })

    function draw() {
        var 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,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 <= 3; i++) {
            //产生随机的验证码
            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 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();
        }
        return show_num;
    }

    function randomColor() {//得到随机的颜色值
        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>

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