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Captcha機能とlayUIの検証

2022-03-01 19:48:59

layUIをご利用の方はお気づきかと思いますが

layUIのキャプチャはとっくに死んでる画像!!!!

はい、死んだ画像です～～～～～。

なんて不運なフレームなんだ。

次のコードは、キャンバスのキャプチャとチェックサムです。少し修正し、利用可能です。

私のプロジェクトへのネストは以下のように動作します。 

<!DOCTYPE html>
<html>
<! -- head -->
<head>
  <meta charset="utf-8">
  <title>Image login verification</title>
  <meta name="renderer" content="webkit">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

  <style>
    body{margin: 10px;}
    .demo-carousel{height: 200px; line-height: 200px; text-align: center;}
    .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;
    }
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
  </style>
</head>

<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>

    <body cz-shortcut-listen="true" class="layui-layout-body">
        <div class="layui-layer-move">
        
        <div class="code">
            <input type="text" value="" placeholder="Please enter a verification code (not case sensitive)" class="input-val">
            <canvas id="canvas" width="100" height="43"></canvas>
            <button class="btn">submit</button>
        </div>
        
        </div>
    </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('Please enter the verification code!') ;
            }else if(val == num){
                alert('Submitted successfully!') ;
                $(".input-val").val('');
                draw(show_num);

            }else{
                alert('Captcha error! Please re-enter!') ;
                $(".input-val").val('');
                draw(show_num);
            }
        })
    })

    function draw(show_num) {
        var canvas_width=$('#canvas').width();
        var canvas_height=$('#canvas').height();
        var canvas = document.getElementById("canvas");//get the object of canvas, actor
        var context = canvas.getContext("2d");//get to the canvas drawing environment, the stage where the actor performs
        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;//get the length of the array
        
        for (var i = 0; i <= 3; i++) {
            var j = Math.floor(Math.random() * aLength);//get the random index value
            var deg = Math.random() * 30 * Math.PI / 180;//generate a random radian between 0 and 30
            var txt = aCode[j];//get a random content
            show_num[i] = txt.toLowerCase();
            var x = 10 + i * 20;//the x coordinate of the text on the canvas
            var y = 20 + Math.random() * 8;//the y-coordinate of the text on the canvas
            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++) { //show lines on captcha
            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++) { //show dots on captcha
            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();
        }
    }

    function randomColor() {//Get a random color value
        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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