标签：white rgb rand javascrip 就是 hit element rect dde
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/css/mui.css
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/css/mui.min.css
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/fonts/mui.ttf
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/js/mui.js
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/js/mui.min.js
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" /> <meta http-equiv="Pragma" content="no-cache" /> <meta http-equiv="Expires" content="0" /> <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <title>js依赖mui.css生成图片验证码</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/css/mui.min.css" /> <style> #verifital_input { border:1px solid black; } /*验证码*/ .verificationCode{ width: 4rem; height: 100%; position: absolute; right: 0; } canvas{ width: 100%; height: 100%; } #code_img { width: 100%; height: 100%; cursor: pointer; vertical-align: top; } </style> </head> <body> <div class="mui-content"> <div class="mui-input-row login_input" style="width:300px;"> <label>验证码</label> <input type="text" id="verifital_input" class="mui-input" placeholder="请输入验证码"> <div id="verificationCode" class="verificationCode"> <canvas width="100" height="40" id="verifyCanvas"></canvas> <img id="code_img"> </div> </div> </div> </body> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/js/mui.min.js" ></script> <script src="https://lib.baomitu.com/jquery/3.4.1/jquery.js"></script> <script> var nums = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0", ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘]; //验证码大写变量 var str = ‘‘; //验证码声明变量 var verVal = drawCode(); // 绘制验证码 function drawCode () { var canvas = document.getElementById("verifyCanvas"); //获取HTML端画布 var context = canvas.getContext("2d"); //获取画布2D上下文 context.fillStyle = "cornflowerblue"; //画布填充色 context.fillRect(0, 0, canvas.width, canvas.height); //清空画布 context.fillStyle = "white"; //设置字体颜色 context.font = "25px Arial"; //设置字体 var rand = new Array(); var x = new Array(); var y = new Array(); //生成四位验证码 for (var i = 0; i < 4; i++) { rand.push(rand[i]); rand[i] = nums[Math.floor(Math.random() * nums.length)] x[i] = i * 20 + 10; y[i] = Math.random() * 20 + 20; context.fillText(rand[i], x[i], y[i]); } //将验证码转化为大写并赋值给str str = rand.join(‘‘).toUpperCase(); //画3条随机线 for (var i = 0; i < 3; i++) { drawline(canvas, context); } // 画30个随机点 for (var i = 0; i < 30; i++) { drawDot(canvas, context); } //绘制图片 convertCanvasToImage(canvas); } // 随机线 function drawline (canvas, context) { context.moveTo(Math.floor(Math.random() * canvas.width), Math.floor(Math.random() * canvas.height)); //随机线的起点x坐标是画布x坐标0位置，y坐标是画布高度的随机数 context.lineTo(Math.floor(Math.random() * canvas.width), Math.floor(Math.random() * canvas.height)); //随机线的终点x坐标是画布宽度，y坐标是画布高度的随机数 context.lineWidth = 0.5; //随机线宽 context.strokeStyle = ‘rgba(50,50,50,0.3)‘; //随机线描边属性 context.stroke(); //描边，即起点描到终点 } // 随机点(所谓画点其实就是画1px像素的线，方法不再赘述) function drawDot (canvas, context) { var px = Math.floor(Math.random() * canvas.width); var py = Math.floor(Math.random() * canvas.height); context.moveTo(px, py); context.lineTo(px + 1, py + 1); context.lineWidth = 0.2; context.stroke(); } // 绘制图片 function convertCanvasToImage (canvas) { document.getElementById("verifyCanvas").style.display = "none"; var image = document.getElementById("code_img"); image.src = canvas.toDataURL("image/png"); return image; } // 点击图片刷新 document.getElementById(‘code_img‘).onclick = function() { resetCode(); } //重置验证码 function resetCode () { $(‘#verifyCanvas‘).remove(); $(‘#code_img‘).before(‘<canvas width="100" height="40" id="verifyCanvas"></canvas>‘) //重新生成验证码 verVal = drawCode(); } document.getElementById("verifital_input").addEventListener("change",validate); //验证事件 function validate(){ var inputCode = document.getElementById("verifital_input").value.toUpperCase(); //取得输入的验证码并转化为大写 if(inputCode.length <= 0) { //若输入的验证码长度为0 alert("请输入验证码！"); //则弹出请输入验证码 $("#verifital_input").focus(); } else if(inputCode != str ) { //若输入的验证码与产生的验证码不一致时 alert("验证码输入错误！@_@"); //则弹出验证码输入错误 resetCode();//刷新验证码 $("#verifital_input").val("");//清空文本框 $("#verifital_input").focus();//重新聚焦验证码框 } else { //输入正确时 $("#verifyCanvas").blur();//绑定验证码输入正确时要做的事 alert("验证码正确！"); } }; </script> </html>
标签：white rgb rand javascrip 就是 hit element rect dde
原文地址：https://www.cnblogs.com/mjtabu/p/11994490.html
