vue+element-ui集成随机验证码+用户名+密码的form表单验证功能


             在登入页面，我们往往需要通过输入验证码才能进行登入，那我们下面就详讲一下在vue项目中如何配合element-ui实现这个功能

第一步：自定义一个生产随机验证码的组件，其本质是使用canvas绘制，详细代码如下：





<template>

 <div class="s-canvas">

 <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>

 </div>

</template>

<script>

export default {

 name: 'SIdentify',

 props: {

 identifyCode: {

  type: String,

  default: '1234'

 },

 fontSizeMin: {

  type: Number,

  default: 16

 },

 fontSizeMax: {

  type: Number,

  default: 40

 },

 backgroundColorMin: {

  type: Number,

  default: 180

 },

 backgroundColorMax: {

  type: Number,

  default: 240

 },

 colorMin: {

  type: Number,

  default: 50

 },

 colorMax: {

  type: Number,

  default: 160

 },

 lineColorMin: {

  type: Number,

  default: 40

 },

 lineColorMax: {

  type: Number,

  default: 180

 },

 dotColorMin: {

  type: Number,

  default: 0

 },

 dotColorMax: {

  type: Number,

  default: 255

 },

 contentWidth: {

  type: Number,

  default: 112

 },

 contentHeight: {

  type: Number,

  default: 38

 }

 },

 methods: {

 // 生成一个随机数

 randomNum(min, max) {

  return Math.floor(Math.random() * (max - min) + min)

 },

 // 生成一个随机的颜色

 randomColor(min, max) {

  var r = this.randomNum(min, max)

  var g = this.randomNum(min, max)

  var b = this.randomNum(min, max)

  return 'rgb(' + r + ',' + g + ',' + b + ')'

 },

 drawPic() {

  var canvas = document.getElementById('s-canvas')

  var ctx = canvas.getContext('2d')

  ctx.textBaseline = 'bottom'

  // 绘制背景

  ctx.fillStyle = this.randomColor(

  this.backgroundColorMin,

  this.backgroundColorMax

  )

  ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)

  // 绘制文字

  for (let i = 0; i < this.identifyCode.length; i++) {

  this.drawText(ctx, this.identifyCode[i], i)

  }

  this.drawLine(ctx)

  this.drawDot(ctx)

 },

 drawText(ctx, txt, i) {

  ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)

  ctx.font =

  this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei'

  var x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))

  var y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)

  var deg = this.randomNum(-45, 45)

  // 修改坐标原点和旋转角度

  ctx.translate(x, y)

  ctx.rotate(deg * Math.PI / 180)

  ctx.fillText(txt, 0, 0)

  // 恢复坐标原点和旋转角度

  ctx.rotate(-deg * Math.PI / 180)

  ctx.translate(-x, -y)

 },

 drawLine(ctx) {

  // 绘制干扰线

  for (let i = 0; i < 8; i++) {

  ctx.strokeStyle = this.randomColor(

   this.lineColorMin,

   this.lineColorMax

  )

  ctx.beginPath()

  ctx.moveTo(

   this.randomNum(0, this.contentWidth),

   this.randomNum(0, this.contentHeight)

  )

  ctx.lineTo(

   this.randomNum(0, this.contentWidth),

   this.randomNum(0, this.contentHeight)

  )

  ctx.stroke()

  }

 },

 drawDot(ctx) {

  // 绘制干扰点

  for (let i = 0; i < 100; i++) {

  ctx.fillStyle = this.randomColor(0, 255)

  ctx.beginPath()

  ctx.arc(

   this.randomNum(0, this.contentWidth),

   this.randomNum(0, this.contentHeight),

   1,

   0,

   2 * Math.PI

  )

  ctx.fill()

  }

 }

 },

 watch: {

 identifyCode() {

  this.drawPic()

 }

 },

 mounted() {

 this.drawPic()

 }

}

</script>



第二步：使用该组件：

我们首先新建一个vue组件，在该组件进行布局，其中还包括用户名和密码的验证（这只是前端的简单验证，真实项目中还需要请求登入接口进行后端验证）





<template>

 <el-form class="login-form" status-icon :rules="loginRules" ref="loginForm" :model="loginForm" label-width="0">

 <el-form-item prop="username">

  <el-input size="small" @keyup.enter.native="handleLogin" v-model="loginForm.username" auto-complete="off" placeholder="请输入用户名">

  <i slot="prefix" class="icon-yonghu"></i>

  </el-input>

 </el-form-item>

 <el-form-item prop="password">

  <el-input size="small" @keyup.enter.native="handleLogin" :type="passwordType" v-model="loginForm.password" auto-complete="off" placeholder="请输入密码">

  <i class="el-icon-view el-input__icon" :style="fontstyle" slot="suffix" @click="showPassword"></i>

  <i slot="prefix" class="icon-mima"></i>

  </el-input>

 </el-form-item>

 <el-form-item prop="verifycode">

  <!-- 注意：prop与input绑定的值一定要一致，否则验证规则中的value会报undefined，因为value即为绑定的input输入值 -->

  <el-input v-model="loginForm.verifycode" placeholder="请输入验证码" class="identifyinput"></el-input>

 </el-form-item>

 <el-form-item>

  <div class="identifybox">

  <div @click="refreshCode">

   <s-identify :identifyCode="identifyCode"></s-identify>

  </div>

  <el-button @click="refreshCode" type='text' class="textbtn">看不清，换一张</el-button>

  </div>

 </el-form-item>

 <el-checkbox v-model="checked">记住账号</el-checkbox>

 <el-form-item>

  <el-button type="primary" size="small" @click.native.prevent="handleLogin" class="login-submit">登录</el-button>

 </el-form-item>

 </el-form>

</template>



 第三步：生产随机码与进行登入验证





<script>

import { isvalidUsername } from '@/utils/validate'

import SIdentify from '@/components/identify/identify.vue'

export default {

 name: 'userlogin',

 data() {

 // 用户名自定义验证规则

 const validateUsername = (rule, value, callback) => {

  if (!isvalidUsername(value)) {

  callback(new Error('请输入正确的用户名'))

  } else {

  console.log('user', value)

  callback()

  }

 }

 // 验证码自定义验证规则

 const validateVerifycode = (rule, value, callback) => {

  if (value === '') {

  callback(new Error('请输入验证码'))

  } else if (value !== this.identifyCode) {

  console.log('validateVerifycode:', value)

  callback(new Error('验证码不正确!'))

  } else {

  callback()

  }

 }

 return {

  fontstyle: {

  },

  loginForm: {

  username: 'admin',

  password: '123456',

  verifycode: ''

  },

  checked: false,

  identifyCodes: '1234567890',

  identifyCode: '',

  loginRules: { // 绑定在form表单中的验证规则

  username: [

   { required: true, trigger: 'blur', validator: validateUsername }

  ],

  password: [

   { required: true, message: '请输入密码', trigger: 'blur' },

   { min: 6, message: '密码长度最少为6位', trigger: 'blur' }

  ],

  verifycode: [

   { required: true, trigger: 'blur', validator: validateVerifycode }

  ]

  },

  passwordType: 'password'

 }

 },

 components: {

 SIdentify

 },

 created() {

 },

 mounted() {

 // 验证码初始化

 this.identifyCode = ''

 this.makeCode(this.identifyCodes, 4)

 },

 computed: {

 },

 props: [],

 methods: {

 // 通过改变input的type使密码可见

 showPassword() {

  this.fontstyle === '' ? (this.fontstyle = 'color: red') : (this.fontstyle = '') // 改变密码可见按钮颜色

  this.passwordType === ''

  ? (this.passwordType = 'password')

  : (this.passwordType = '')

 },

 // 点击登入按钮

 handleLogin() {

  this.$refs.loginForm.validate(valid => {

  if (valid) {

   this.$store.dispatch('Login', this.loginForm).then(res => {

   this.$router.push({ path: '/dashboard/dashboard' })

   })

  }

  })

 },

 // 生成随机数

 randomNum(min, max) {

  return Math.floor(Math.random() * (max - min) + min)

 },

 // 切换验证码

 refreshCode() {

  this.identifyCode = ''

  this.makeCode(this.identifyCodes, 4)

 },

 // 生成四位随机验证码

 makeCode(o, l) {

  for (let i = 0; i < l; i++) {

  this.identifyCode += this.identifyCodes[

   this.randomNum(0, this.identifyCodes.length)

  ]

  }

  console.log(this.identifyCode)

 }

 }

}

</script>

<style scoped>

.identifybox{

 display: flex;

 justify-content: space-between;

 margin-top:7px;

}

.iconstyle{

 color:#409EFF;

}

</style>



最后的效果如下，当我们输入之后鼠标失去焦点就会进行验证：



总结

以上所述是小编给大家介绍的vue+element-ui集成随机验证码+用户名+密码的form表单验证功能，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！