layUI的验证码功能及校验实例

用layUI的伙伴一定发现了： layUI的验证码是长死图！！！没错，是死图~~~~ 什么倒霉框架。下面代码是canvas验证码及校验。稍微修改及可用。我嵌套到项目里的效果如图： <!DOCTYPE...

用layUI的伙伴一定发现了：

layUI的验证码是长死图！！！

没错，是死图~~~~

什么倒霉框架。

下面代码是canvas验证码及校验。稍微修改及可用。

我嵌套到项目里的效果如图：

<!DOCTYPE html>
<html>
<!-- head -->
<head>
 <meta charset="utf-8">
 <title>图片登录验证</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="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>
    
    </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('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);
      }
    })
  })
 
  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,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++) {
      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();
    }
  }
 
  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>

原文链接：https://blog.csdn.net/qq_15936309/article/details/81451546

发表于 2020-08-19 17:26
阅读 ( 613 )
分类：web前端开发

layUI的验证码功能及校验实例

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