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

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

以上所述是米米素材网小编给大家介绍的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！