js依赖mui.css生成图片验证码
作者：互联网
js依赖mui.css生成图片验证码
相关css和js引入路径
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('') //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：canvas,验证码,js,var,mui,css 来源： https://blog.51cto.com/u_15222067/2808806