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

1、效果圖

2、在components下面新建檔案identify.vue，內容：

<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: {
      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: 112
    },contentHeight:www.cppcns.com
 
 {
      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.getElemenkNAIAglR
 
tById('s-canvas')
      var 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)
      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.fillText(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++) {
 
程式設計客棧
        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 < 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='scss' scoped>
.s-canvas {
    height: 38px;
}
.s-canvas canvas{
    margin-top: 1px;
    margin-left: 8px;
}
</style>

3、頁面引入

<script>
 import SIdentify from '../../components/identify'
 export default {
    components: { SIdentify }
  }
  data() {
    // 驗證碼自定義驗證規則
    const validateVerifycode = (rule,value,callback) => {
      const newVal = value.toLowerCase()
      const identifyStr = this.identifyCode.toLow程式設計客棧erCase()
      if (newVal === '') {
        callback(new Error('請輸入驗證碼'))
      } else if (newVal !== identifyStr) {
        console.log('validateVerifycode:',value)
        callback(new Error('驗證碼不正確!'))
      } else {
        callback()
      }
    }
    return {
      identifyCodes: '3456789ABCDEFGHGKMNPQRSTUVWXY',identifyCode: '',ruleForm: {
        userName: '',password: '',verifycode: ''
      },rules: {
        verifycode: [
          { required: true,trigger: 'blur',validator: validateVerifycode }
        ]
      }
 }
    }
</script>

4、html

<el-form-item prop="verifycode">kNAIAglR;
 <div style="display:flex">
 <el-input
 v-model="ruleForm.verifycode"
 placeholder="請輸入驗證碼"
 @keyup.enter.native="login('ruleForm')"
 ></el-input>
 <span @click="refreshCode"
 ><s-identify :identifyCode="identifyCode"></s-identify
 ></span>
 </div>
</el-form-item>

5、mounted

mounted() {
    // 驗證碼初始化
    this.identifyCode = ''
    this.makeCode(this.identifyCodes,4)
  }

6、methods

methods: {
    // 生成隨機數
    randomNum(min,// 切換驗證碼
    refreshCode() {
      this.identifyCode = ''
      this.makeCode(this.identifyCodes,4)
    },// 生成四位隨機驗證碼
    makeCode(o,l) {
      for (let i = 0; i < l; i++) {
        this.identifyCode += this.identifyCodes[
          this.randomNum(0,this.identifyCodes.length)
        ]
      }
    }
 }

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。