本文例項為大家分享了vue實現登入時的圖片驗證碼的具體程式碼，供大家參考，具體內容如下

效果圖

一、新建vue元件components/identify/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: 28
    },fontSizeMax: {
      type: Number,default: 40
    },backgroundColorMin: {
      type: Number,default: 180
    },backgroundColorMax: {
      type: Number,default: 240
    },colorMin: {
      twww.cppcns.com
 
ype: Number,default: 50
    },colorMax: {
www.cppcns.com      type: Number,default: 160
    },lineColorMin: {
      type: Number,lineColorMax: {
      type: Number,dotColorMin: {
      type: Number,default: 0
    },dotColorMax: {
      type: Number,default: 255
    },contentWidth: {
      type: Number,default: 112
    },contentHeight: {
      type: Number,default: 40
    }
  },methods: {
    // 生成一個隨機數
    randomNum (min,max) {
      return Math.floor(Math.random() * (max - min) + min)
    },// 生成一個隨機的顏色
    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'
      // 繪製背景
      ctx.fillStyle = this.randomColor(
        this.backgroundColorMin,this.b
 
程式設計客棧ackgroundColorMax
      )
      ctx.fillRect(0,this.contentWidth,this.contentHeight)
      // 繪製文字
      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(-30,30)
      // 修改座標原點和旋轉角度
      ctx.translate(x,y)
      ctx.rotate(deg * Math.PI / 270)
      ctx.fi
 
程式設計客棧llText(txt,0)
      // 恢復座標原點和旋轉角度
      ctx.rotate(-deg * Math.PI / 270)
      ctx.translate(-x,-y)
    },drawLine (ctx) {
      // 繪製干擾線
      for (let i = 0; i < 2; i++) {
        ctx.strokeStyle = this.randomColor(
          this.lineColorMin,this.lineColorMax
        )
        ctx.beginPath()
        ctx.moveTo(
          this.randomNum(0,this.contentWidth),this.randomNum(0,this.cont程式設計客棧entHeight)
        )
        ctx.lineTo(
          this.randomNum(0,this.contentHeight)
        )
        ctx.stroke()
      }
    },drawDot (ctx) {
      // 繪製干擾點
      for (let i = 0; i < 20; i++) {
        ctx.fillStyle = this.randomColor(0,255)
        ctx.beginPath()
        ctx.arc(
          this.randomNum(0,this.contentHeight),1,2 * Math.PI
        )
        ctx.fill()
      }
    }
  },watch: {
    identifyCode () {
      this.drawPic()
    }
  },mounted () {
    this.drawPic()
  }
}
</script>
<style lang='less' scoped>
.s-canvas {
    height: 38px;
}
.s-canvas canvas{
    margin-top: 1px;
    margin-left: 8px;
}
</style>

二、需要地方引入

<template>
 <span @click="refreshCode" style="cursor: pointer;">
  <s-identify :identifyCode="identifyCode" ></s-identify>
 </span>
</template>

<script>
// 引入圖片驗證碼元件
import SIdentify from '@/components/identify'
export default {
 components: { SIdentify },data() {
  return {
   // 圖片驗證碼
   identifyCode: '',// 驗證碼規則
   identifyCodes: '3456789ABCDEFGHGKMNPQRSTUVWXY',}
 },methods: {
  // 切換驗證碼
     refreshCode() {
   this.identifyCode = ''
   this.makeCode(this.identifyCodes,4)
     },// 生成隨機驗證碼
  makeCode(o,l) {
    for (let i = 0; i < l; i++) {
      this.identifyCode += this.identifyCodes[
        Math.floor(Math.random() * (this.identifyCodes.length - 0) + 0)
      ]
    }
  },}
}
</script>

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。