vue elementにフロントエンドの画像検証を登録

ステップ1:新規コンポーネントidentify.vue

<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: 25
  },
  fontSizeMax: { //      
   type: Number,
   default: 35
  },
  backgroundColorMin: { //            
   type: Number,
   default: 200
  },
  backgroundColorMax: { //            
   type: Number,
   default: 220
  },
  dotColorMin: { //         
   type: Number,
   default: 60
  },
  dotColorMax: { //         
   type: Number,
   default: 120
  },
  contentWidth: { //     
   type: Number,
   default: 90
  },
  contentHeight: { //     
   type: Number,
   default: 38
  }
 },
 methods: {
  //        
  randomNum (min, max) {
   return Math.floor(Math.random() * (max - min) + min)
  },
  
  //          
  randomColor (min, max) {
   let r = this.randomNum(min, max)
   let g = this.randomNum(min, max)
   let b = this.randomNum(min, max)
   return 'rgb(' + r + ',' + g + ',' + b + ')'
  },
  
  drawPic () {
   let canvas = document.getElementById('s-canvas')
   let ctx = canvas.getContext('2d')
   ctx.textBaseline = 'bottom'
   //     
   ctx.fillStyle = '#e6ecfd'
   ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
   //     
   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(50, 160) //         
   ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei' //         
   let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
   let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
   var deg = this.randomNum(-30, 30)
   //            
   ctx.translate(x, y)
   ctx.rotate(deg * Math.PI / 180)
   ctx.fillText(txt, 0, 0)
   //            
   ctx.rotate(-deg * Math.PI / 180)
   ctx.translate(-x, -y)
  },
  
  drawLine (ctx) {
   //      
   for (let i = 0; i < 4; i++) {
    ctx.strokeStyle = this.randomColor(100, 200)
    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) {
   //      
   for (let i = 0; i < 30; 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>

ステップ2では、大陸ページに追加

<el-form-item prop="code">
	<el-input type="text" v-model="account.code" placeholder="- - - -">
	   <template slot="prepend">   </template>
	   <template slot="append">
	    <div class="login-code" @click="refreshCode">
	     <Identify :identifyCode="identifyCode"></Identify>
	    </div>
	   </template>
	  </el-input>
</el-form-item>

ステップ3、コンポーネントの導入

import Identify from '@/views/identify';


components:{
			Identify
		},//    

created() {
      let reg_user = JSON.parse(window.sessionStorage.getItem('register-user'));
      if (reg_user) {
        this.account.username = reg_user.username;
        this.account.pwd = '';
        this.pwdFocus = true;
      }
    },
mounted () {
		  //       
		  this.identifyCode = ''
		  this.makeCode(this.identifyCodes, 4)
		 },


 //      
		  refreshCode () {
		   this.identifyCode = ''
		   this.makeCode(this.identifyCodes, 4)
		  },
			makeCode (o, l) {
			   for (let i = 0; i < l; i++) {
			    this.identifyCode += this.identifyCodes[this.randomNum(0, this.identifyCodes.length)]
			   }
			  },
			  randomNum (min, max) {
			   return Math.floor(Math.random() * (max - min) + min)
			  },

ステップ4パラメータを追加

identifyCodes: '1234567890abcdefjhijklinopqrsduvwxyz',
identifyCode: '',


//            
if (this.account.code.toLowerCase() !== this.identifyCode.toLowerCase()) {
 this.$message.error('        ')
    this.refreshCode()
    return
   }