目录
验证码实现效果如下：
生成验证码的方法：
function code_draw() {
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"; //取值范围
var aCode = sCode.split(",");
var aLength = aCode.length; //获取到数组的长度
var value = [];
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
value[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 = code_randomColor();
context.fillText(txt,0);
context.rotate(-deg);
context.translate(-x,-y);
}
// 将生成的值以属性的方法添加到元素
value = value.join("");
$('#canvas').attr('data-code',value)
//验证码上显示线条
for (var i = 0; i <= 5; i++) {
context.strokeStyle = code_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();
}
//验证码上显示小点
for (var i = 0; i <= 30; i++) {
context.strokeStyle = code_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();
}
}生成验证码随机背景颜色
function code_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 + ")";
}
在html中引用
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery canvas验证码</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html {
width: 100%;
height: 100%;
font-size: 16px;
}
body {
width: 100%;
height: 100%;
-moz-user-select: none;
/*火狐*/
/*禁止用户在页面选择文字*/
-webkit-user-select: none;
/*webkit浏览器*/
-ms-user-select: none;
/*IE10*/
-khtml-user-select: none;
/*早期浏览器*/
user-select: none;
}
.code {
padding-top: 50px;
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,.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;
}
</style>
</head>
<body>
<div class="code">
<input type="text" value="" placeholder="验证码" class="input-val" />
<canvas id="canvas" width="100" height="43"></canvas>
<button class="btn">提交</button>
</div>
</body>完整源码下载地址：
https://download.csdn.net/download/weixin_42350212/13778347
原文地址：https://lexsaints.blog.csdn.net
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