纯前端实现的验证码

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需求

前端实现验证码输入

封装

 本质绘制随机数，并进行校验

function GVerify(options) { // 创建一个图形验证码对象，接收options对象为参数  this.options = { // 默认options参数值    id: '', // 容器Id    canvasId: 'verifyCanvas', // canvas的ID    width: '100%', // 默认canvas宽度    height: '100%', // 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 con = document.getElementById(this.options.id)    var canvas = document.createElement('canvas')    // this.options.width = con.offsetWidth > 0 ? con.offsetWidth : '30'    // this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30'    this.options.width = con.offsetWidth    this.options.height = '40'    canvas.id = this.options.canvasId    canvas.width = this.options.width    canvas.height = this.options.height    canvas.style.cursor = 'pointer'    canvas.innerHTML = '您的浏览器版本不支持canvas'    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') {      // eslint-disable-next-line no-redeclare      var txtArr = this.options.numArr    } else {      // eslint-disable-next-line no-redeclare      var txtArr = this.options.letterArr    }    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**/    // eslint-disable-next-line no-redeclare    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**/    // eslint-disable-next-line no-redeclare    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) {    // eslint-disable-next-line no-redeclare    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}

使用

<div class="login-code">    <div id="v_container" /></div>import { GVerify } from './component/GVerify'// element的自定义校验验证码const rightCode = (rule, value, callback) => {      if (value) {        const verifyFlag = this.verifyCode.validate(value)        if (!verifyFlag) {          callback(new Error('请输入正确的验证码'))        } else {          callback()        }      } else {        callback()      }    }rules: {···   code: [      { required: true, message: '请输入验证码', trigger: 'blur' },      { required: true, trigger: 'blur', validator: rightCode }    ]  },mounted() {    this.verifyCode = new GVerify('v_container')  },

如果登录失败 使用 验证码刷新this.verifyCode.refresh()

拓展：变成加减乘的格式（0-10以内）

如果想做成加减乘那种只需要在代码中进行修改 校验函数和绘制函数即可

function GVerify(options) { // 创建一个图形验证码对象，接收options对象为参数  this.options = { // 默认options参数值    id: '', // 容器Id    canvasId: 'verifyCanvas', // canvas的ID    width: '100%', // 默认canvas宽度    height: '100%', // 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 con = document.getElementById(this.options.id)    var canvas = document.createElement('canvas')    // this.options.width = con.offsetWidth > 0 ? con.offsetWidth : '30'    // this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30'    this.options.width = con.offsetWidth    this.options.height = '40'    canvas.id = this.options.canvasId    canvas.width = this.options.width    canvas.height = this.options.height    canvas.style.cursor = 'pointer'    canvas.innerHTML = '您的浏览器版本不支持canvas'    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') {      // eslint-disable-next-line no-redeclare      var txtArr = this.options.numArr    } else {      // eslint-disable-next-line no-redeclare      var txtArr = this.options.letterArr    }    this.options.code = []    for (var i = 1; i <= 3; i++) {      var txt = txtArr[randomNum(0, txtArr.length)]      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)    // 中间符号      if (i === 2) {        const index = randomNum(0, 3)        const fuhao = ['+', '-', '*'][index]        console.log(fuhao)        ctx.fillText(fuhao, 0, 0)        this.options.code.push(fuhao)      } else {        ctx.fillText(txt, 0, 0)        this.options.code.push(Number(txt))      }      /** 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**/    // eslint-disable-next-line no-redeclare    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**/    // eslint-disable-next-line no-redeclare    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) {    // eslint-disable-next-line no-redeclare    var code = Number(code)    var v_code    if (this.options.code[1] === '-') {      v_code = this.options.code[0] - this.options.code[2]    } else if (this.options.code[1] === '+') {      v_code = this.options.code[0] + this.options.code[2]    } else if (this.options.code[1] === '*') {      v_code = this.options.code[0] * this.options.code[2]    }    console.log(this.options.code, v_code, code)    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}

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