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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
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<meta http-equiv="Pragma" content="no-cache" />
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<meta http-equiv="Expires" content="0" />
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<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-status-bar-style" content="black">
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<title>验证码生成示例</title>
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<link rel="stylesheet" href="../css/mui.min.css" />
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<style>
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/*验证码*/
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.verificationCode{
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width: 4rem;
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height: 100%;
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position: absolute;
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right: 0;
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}
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canvas{
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width: 100%;
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height: 100%;
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}
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#code_img {
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width: 100%;
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height: 100%;
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cursor: pointer;
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<div class="mui-content">
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<div class="mui-input-row login_input">
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<label>验证码</label>
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<div id="verificationCode" class="verificationCode">
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<canvas width="100" height="40" id="verifyCanvas"></canvas>
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<img id="code_img">
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</div>
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</div>
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</div>
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</body>
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<script type="text/javascript" src="/.idea/js/mui.js" ></script>
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<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
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<script>
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console.log(verVal)
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</script>
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<script>
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var nums = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0",
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'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',
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'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'
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];
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var str = '';
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var verVal = drawCode();
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// 绘制验证码
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function drawCode (str) {
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var canvas = document.getElementById("verifyCanvas"); //获取HTML端画布
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var context = canvas.getContext("2d"); //获取画布2D上下文
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context.fillStyle = "cornflowerblue"; //画布填充色
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context.fillRect(0, 0, canvas.width, canvas.height); //清空画布
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context.fillStyle = "white"; //设置字体颜色
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context.font = "25px Arial"; //设置字体
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var rand = new Array();
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var x = new Array();
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var y = new Array();
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for (var i = 0; i < 4; i++) {
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rand.push(rand[i]);
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rand[i] = nums[Math.floor(Math.random() * nums.length)]
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x[i] = i * 20 + 10;
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y[i] = Math.random() * 20 + 20;
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context.fillText(rand[i], x[i], y[i]);
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}
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str = rand.join('').toUpperCase();
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//画3条随机线
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for (var i = 0; i < 3; i++) {
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drawline(canvas, context);
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}
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// 画30个随机点
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for (var i = 0; i < 30; i++) {
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drawDot(canvas, context);
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}
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convertCanvasToImage(canvas);
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return str;
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}
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// 随机线
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function drawline (canvas, context) {
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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
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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
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context.lineWidth = 0.5; //随机线宽
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context.strokeStyle = 'rgba(50,50,50,0.3)'; //随机线描边属性
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context.stroke(); //描边，即起点描到终点
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}
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// 随机点(所谓画点其实就是画1px像素的线，方法不再赘述)
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function drawDot (canvas, context) {
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var px = Math.floor(Math.random() * canvas.width);
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var py = Math.floor(Math.random() * canvas.height);
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context.moveTo(px, py);
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context.lineTo(px + 1, py + 1);
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context.lineWidth = 0.2;
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context.stroke();
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}
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// 绘制图片
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function convertCanvasToImage (canvas) {
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document.getElementById("verifyCanvas").style.display = "none";
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var image = document.getElementById("code_img");
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image.src = canvas.toDataURL("image/png");
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return image;
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}
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// 点击图片刷新
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document.getElementById('code_img').onclick = function() {
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resetCode();
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}
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function resetCode () {
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$('#verifyCanvas').remove();
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$('#code_img').before('<canvas width="100" height="40" id="verifyCanvas"></canvas>')
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verVal = drawCode();
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}
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</script>
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</html>
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