技术汇总：第七章：三种验证方式

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发布于 2023-01-06 20:45:04

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发布于 2023-01-06 20:45:04

文章被收录于专栏：高端IT高端IT

第一种验证码

b.html

   <!DOCTYPE html>
    <html>
     
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=9; IE=8; IE=7; IE=EDGE">
        <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
        <title>设置-个人信息</title>
     
    </head>
     
    <body>
     
    </body>
        <script type="text/javascript" src="jquery.min.js" ></script>
        <script type="text/javascript" src="a.js" ></script>
    <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="30"></canvas>
      <button class="btn">提交</button>
    </div>
    </html>
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a.js

 $(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();
      }
     }
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更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/120575426

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