vue项目web前端登录页数字验证码 登录流程

1.创建code.js文件夹下面是js代码
function GVerify(options) { console.log(); // 创建一个图形验证码对象，接收options对象为参数 this.
con= document.getElementById(options) this.options = { // 默认options参数值 id: '',
// 容器Id canvasId: 'verifyCanvas', // canvas的ID width: this.con.offsetWidth, //
默认canvas宽度 height: this.con.offsetHeight, // 默认canvas高度 type: 'number', //
图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母 code: '' } if (Object.prototype.
toString.call(options) === '[object Object]') { // 判断传入参数类型 for (var i in
options) { // 根据传入的参数，修改默认参数值 this.options[i] = options[i] } } else { this.
options.id = options } this.options.numArr = '0,1,2,3,4,5,6,7,8,9'.split(',')
this.options.letterArr = getAllLetter() this._init() this.refresh() } GVerify.
prototype= { /** 版本号**/ version: '1.0.0', /** 初始化方法**/ _init: function () { var
canvas= document.createElement('canvas') canvas.id = this.options.canvasId let {
width, height } = this.options canvas.width = width canvas.height = height
canvas.style.cursor = 'pointer' canvas.innerHTML = '您的浏览器版本不支持canvas' this.con.
appendChild(canvas) var parent = this canvas.onclick = function () { parent.
refresh() } }, /** 生成验证码**/ refresh: function () { var canvas = document.
getElementById(this.options.canvasId) if (canvas.getContext) { var ctx = canvas.
getContext('2d') } ctx.textBaseline = 'middle' ctx.fillStyle = randomColor(180,
240) ctx.fillRect(0, 0, this.options.width, this.options.height) if (this.
options.type === 'blend') { // 判断验证码类型 var txtArr = this.options.numArr.concat(
this.options.letterArr) } else if (this.options.type === 'number') { var txtArr
= this.options.numArr } else { var txtArr = this.options.letterArr } this.
options.code = '' for (var i = 1; i <= 4; i++) { var txt = txtArr[randomNum(0,
txtArr.length)] this.options.code += txt ctx.font = randomNum(this.options.
height/ 2, this.options.height) + 'px SimHei' // 随机生成字体大小 ctx.fillStyle =
randomColor(50, 160) // 随机生成字体颜色 ctx.shadowOffsetX = randomNum(-3, 3) ctx.
shadowOffsetY= randomNum(-3, 3) ctx.shadowBlur = randomNum(-3, 3) ctx.
shadowColor= 'rgba(0, 0, 0, 0.3)' var x = this.options.width / 5 * i var y =
this.options.height / 2 var deg = randomNum(-30, 30) /** 设置旋转角度和坐标原点**/ ctx.
translate(x, y) ctx.rotate(deg * Math.PI / 180) ctx.fillText(txt, 0, 0) /**
恢复旋转角度和坐标原点**/ ctx.rotate(-deg * Math.PI / 180) ctx.translate(-x, -y) } /**
绘制干扰线**/ for (var i = 0; i < 4; i++) { ctx.strokeStyle = randomColor(40, 180)
ctx.beginPath() ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.
options.height)) ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.
options.height)) ctx.stroke() } /** 绘制干扰点**/ for (var i = 0; i < this.options.
width/ 4; i++) { ctx.fillStyle = randomColor(0, 255) ctx.beginPath() ctx.arc(
randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 *
Math.PI) ctx.fill() } }, /** 验证验证码**/ validate: function (code) { var code =
code.toLowerCase() var v_code = this.options.code.toLowerCase() if (code ==
v_code) { return true } else { return false } } } /** 生成字母数组**/ function
getAllLetter() { var letterStr =
'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'
return letterStr.split(',') } /** 生成一个随机数**/ function randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min) } /** 生成一个随机色**/ function
randomColor(min, max) { var r = randomNum(min, max) var g = randomNum(min, max)
var b = randomNum(min, max) return 'rgb(' + r + ',' + g + ',' + b + ')' } export
{ GVerify }
2.code.js在组件中引入

3.在data中定义如下两个属性
value:"", verifyCode: "",
4.在mounted中执行方法
mounted(){ this.verifyCode = new GVerify("auth_code"); },
5.在template中定义div需要给div设置宽高
<div id="auth_code"></div>
6.在登录请求前进行判断成功向下执行,失败return并同时执行this.verifyCode.refresh()方法切换验证码，同时按照逻辑
在登录失败账号或密码错误时也需要执行this.verifyCode.refresh()切换验证码
if(this.verifyCode.validate(this.value)){ }else{ this.$message({ message:
"验证码错误", type: 'warning' }); this.verifyCode.refresh(); return }
7.效果图

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