使用vue的简单的纯前端JS验证码实现
感觉人不能在SQL里面淹死，得看看别的东西了
因为是上班摸鱼偷摸搞的，所以人比较懒，很多东西也懒得修修改改，直接放在一个html文件下了
页面如下
js的生成图形逻辑是21年毕业的时候百度CV的，出处是找不到了
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>测试纯前端验证码</title>
<!-- CSS -->
<link rel="stylesheet" href="assets/bootstrap/css/bootstrap.min.css">
<style>
.input-val {
width: 250px;
height: 50px;
border: 1px solid #ddd;
box-sizing: border-box;
}
#canvas {
height: 50px;
vertical-align: middle;
box-sizing: border-box;
border: 1px solid #ddd;
cursor: pointer;
}
.btn {
height: 50px;
margin: 0;
padding: 0 20px;
vertical-align: middle;
border: 0;
font-size: 16px;
font-weight: 300;
line-height: 50px;
color: #000000;
}
.form-bottom {
padding: 25px 25px 30px 25px;
border-radius: 0 0 4px 4px;
text-align: left;
}
</style>
</head>
<body>
<div id="passport" class="form-bottom">
<div class="code">
<input type="text" value="" placeholder="请输入图形验证码" class="input-val">
<canvas class="canvas" id="canvas" width="100" height="40" @click='clickChangeImg'></canvas>
<button type="button" class="btn" @click="display">登录</button>
</div>
</div>
<script src="libs/vue.min.js"></script>
<script src="assets/js/jquery-1.11.1.min.js"></script>
<script src="assets/bootstrap/js/bootstrap.min.js"></script>
<script src="assets/js/jquery.backstretch.min.js"></script>
<script type="text/javascript">
var mainPage = new Vue({
el: "#passport",
data: {
sendCodeValue: "图形验证码校验",
imgCode: [],
},
created() {
},
mounted() {
var show_num = [];
this.draw(show_num);
console.log(show_num)
this.imgCode = show_num
},
destroyed() {
console.log("destroyed");
},
methods: {
clickChangeImg() {
var show_num = [];
this.draw(show_num);
this.imgCode = show_num
},
// 提交按钮，登录&注册
display() {
var val = $(".input-val").val().toLowerCase();
var num = this.imgCode.join("");
if (val == '') {
alert('请输入图形验证码！');
} else if (val == num) {
alert('图形验证码验证成功！');
} else {
alert('图形验证码错误！请重新输入！');
// $(".input-val").val('');
}
},
//生成并渲染出验证码图形
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
var context = canvas.getContext("2d");//获取到canvas画图的环境
canvas.width = canvas_width;
canvas.height = canvas_height;
var sCode = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,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(","); //把字符串分割成字符串数组。
var aLength = aCode.length;//获取到数组的长度
for (var i = 0; i < 4; i++) { //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
var j = Math.floor(Math.random() * aLength);//获取到随机的索引值,random() 方法可返回介于 0（包含） ~ 1（不包含） 之间的一个随机数。
// var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
var deg = Math.random() - 0.5; //产生一个随机弧度
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 = this.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 = this.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 = this.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();
}
},
//得到随机的颜色值
randomColor() {
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>
</body>
</html>