【vue】纯前端图形验证码实现

【vue】纯前端图形验证码实现

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

image

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>
posted @ 2023-06-01 15:39  DbWong_0918  阅读(494)  评论(0)  编辑  收藏  举报