vue.js+canvas实现随机验证码
登录注册啥的,不需要下载插件,上图:
代码:
<template> <div class="about"> <p>当前验证码:{{codeStr}}</p> <canvas id="canvas" width="100" height="43" @click="createCode"></canvas> </div> </template> <script> export default { data(){ return{ 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,q,w,e,r,t,y,u,i,o,p,a,s,d,f,g,h,j,k,l,z,x,c,v,b,n,m", codeStr:[], //当前code码 } }, mounted:function(){ this.createCode() }, methods:{ //得到随机的颜色值 randomColor() { let r = Math.floor(Math.random() * 256); let g = Math.floor(Math.random() * 256); let b = Math.floor(Math.random() * 256); return "rgb(" + r + "," + g + "," + b + ")"; }, // 生成二维码 createCode(){ this.codeStr = '' let canvas_width=document.getElementById('canvas').clientWidth; let canvas_height=document.getElementById('canvas').clientHeight; let canvas = document.getElementById("canvas");//获取到canvas的对象,演员 let 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; let aCode = this.sCode.split(","); let aLength = aCode.length;//获取到数组的长度 for (let i = 0; i <= 3; i++) { let j = Math.floor(Math.random() * aLength);//获取到随机的索引值 let deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度 let txt = aCode[j];//得到随机的一个内容 this.codeStr+= txt; let x = 10 + i * 20;//文字在canvas上的x坐标 let 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(); } } } } </script> <style scoped> #canvas{ border: 1px solid #aba5a5; } </style>