本文例項為大家分享了vue實現圖形驗證碼的具體程式碼，供大家參考，具體內容如下

效果圖：

或

或

或

程式碼：

驗證碼元件：

src/common/sIdentify.vue

<template>
  <div class="s-canvas">
    <canvas id="s-canvas" :width="contentWidth" :height="contentHeight">&l程式設計客棧t;/canvas>
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</template>
<script>
  export default {
    name: 'SIdentify',props: {
      identifyCode: {
        type: String,default: '1234'
      },fontSizeMin: {
        type: Number,default: 18
      },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,lineColorMax: {
        type: Number,dotColorMin: {
        type: Number,default: 0
      },dotColorMax: {
        type: Number,default: 255
      },contentWidth: {
        type: Number,default: 111
      },contentHeight: {
        type: Number,default: 38
      }
    },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) {
        let r = this.randomNum(min,max)
        let g = this.randomNum(min,max)
        let b = this.randomNum(min,max)
       http://www.cppcns.com
 
 return 'rgb(' + r + ',' + g + ',' + b + ')'
      },drawPic() {
        let canvas = document.getElementById('s-canvas')
        let ctx = canvas.getContext('2d')
        ctx.textBaseline = 'bottom'
        // 繪製背景
        ctx.fillStyle = this.randomColor(this.backgroundColorMin,this.backgroundColorMax)
        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) // 繪製干擾線
        // this.drawDot(ctx) // 繪製干擾點
      },// 繪製文字
      drawText(ctx,txt,i) {
        ctx.fillStyle = this.randomColor(this.colorMin,this.colorMax)
        ctx.font = this.randomNum(this.fontSizeMin,this.fonthttp://www.cppcns.com
 
SizeMax) + '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) // 字元旋轉角度(不超過45度比較好)
        // 修改座標原點和旋轉角度
        ctx.translate(x,y)
        ctx.rotate(deg * Math.PI / 180)
        ctx.fillText(txt,0)
        // 恢復座標原點和旋轉角度
        ctx.rotate(-deg * Math.PI / 180)
        ctx.translate(-x,-y)
      },drawLine(ctx) {
        // 繪製干擾線
        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.contentHeight))
          ctx.stroke()
        }
      },drawDot(ctx) {
        // 繪製干擾點
        for (let i = 0; i < 100; 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>

父元件

<template>
  <div>
    <div>驗證碼測試</div>
    <div @click="refreshCode()" class="code" style="cursor:pointer;" title="點選切換驗證碼">
      <s-identify :identifyCode="identifyCode"></s-identify>
    </div>
  </div>
</template>

<script>
import { defineComponent } from 'vue';
import sIdentify from "@/common/sIdentify.vue";
// import axios from 'axios'
export default defineComponent({
  name: 'WatermarkTest',components: { sIdentify },data() {
    return {
      identifyCode: "",identifyCodes: ['0','1','2','3','4','5','6','7','8'www.cppcns.com,'9','a','b','c','d'],//根據實際需求加入自己想要的字元
    }
  },mounted() {
    this.refreshCode()
 },unmounted() {

 },methods: {
    // 生成隨機數
    randomNum(min,max) {
      max = max + 1
      return Math.floor(Math.random() * (max - min) + min);
    },// 更新驗證碼
    refreshCode() {
      this.identifyCode = "";
      this.makeCode(this.identifyCodes,4);
      console.log('當前驗證碼:',this.identifyCode);
    },// 隨機生成驗證碼字串
    makeCode(data,len) {
      console.log('data,len:',data,len)
      for (let i = 0; i < len; i++) {
        this.identifyCode += this.identifyCodes[this.randomNum(0,this.identifyCodes.length-1)]
      }
    },},});
</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。