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 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>
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