Vue implementation of graphic verification code

Time:2022-6-30

In this paper, an example is given to share the specific code of Vue to realize the graphic verification code for your reference. The specific contents are as follows

design sketch:

or

or

or

code:

Verification code component:

src/common/sIdentify.vue

<template>
  <div>
    <canvas :width="contentWidth" :height="contentHeight"></canvas>
  </div>
</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,
        default: 40
      },
      lineColorMax: {
        type: Number,
        default: 180
      },
      dotColorMin: {
        type: Number,
        default: 0
      },
      dotColorMax: {
        type: Number,
        default: 255
      },
      contentWidth: {
        type: Number,
        default: 111
      },
      contentHeight: {
        type: Number,
        default: 38
      }
    },
    methods: {
      //Generate a random number
      randomNum(min, max) {
        return Math.floor(Math.random() * (max - min) + min)
      },
      //Generate a random color
      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'
        //Draw background
        ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
        ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
        //Draw text
        for (let i = 0; i < this.identifyCode.length; i++) {
          this.drawText(ctx, this.identifyCode[i], i)
        }
        // this. DrawLine (CTX) // draw the interference line
        // this. Drawdot (CTX) // draw interference points
      },
      //Draw text
      drawText(ctx, txt, i) {
        ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
        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) // character rotation angle (it is better not to exceed 45 °)
        //Modify coordinate origin and rotation angle
        ctx.translate(x, y)
        ctx.rotate(deg * Math.PI / 180)
        ctx.fillText(txt, 0, 0)
        //Restore coordinate origin and rotation angle
        ctx.rotate(-deg * Math.PI / 180)
        ctx.translate(-x, -y)
      },
      drawLine(ctx) {
        //Draw interference line
        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) {
        //Draw interference points
        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>

Parent component

<template>
  <div>
    <div> verification code test </div>
    <div @click="refreshCode()" style="cursor:pointer;"  Title= "click to switch verification code" >
      <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','9','a','b','c','d'], // add the characters you want according to your actual needs
    }
  },
  mounted() {
    this.refreshCode()
 },
 unmounted() {

 },
  methods: {
    //Generate random number
    randomNum(min, max) {
      max = max + 1
      return Math.floor(Math.random() * (max - min) + min);
    },
    //Update verification code
    refreshCode() {
      this.identifyCode = "";
      this.makeCode(this.identifyCodes, 4);
      console. Log ('current verification code: ', this.identifycode);
    },
    //Randomly generate verification code string
    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>

The above is the whole content of this article. I hope it will help you in your study, and I hope you can support developepper.

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