Vue project implements graphic verification code

This article example shares the specific code of the Vue project to implement the graphic verification code for your reference. The specific content is as follows

Effect preview: (The project requires a clean look, so there is no background. But the following code will include background interference)

1. Download the identify plug-in, command: npm i identify

2. Create a new vue component in your components directory. My name is: sIdentify.vue

3. Copy the following code into the component (you can customize it!)

<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: 35
    },
    fontSizeMax: {
      type: Number,
      default: 35
    },
    backgroundColorMin: {
      type: Number,
      default: 180
    },
    backgroundColorMax: {
      type: Number,
      default: 240
    },
    colorMin:
      type: Number,
      default: 50
    },
    colorMax: {
      type: Number,
      default: 160
    },
    lineColorMin: {
      type: Number,
      default: 100
    },
    lineColorMax: {
      type: Number,
      default: 200
    },
    dotColorMin: {
      type: Number,
      default: 0
    },
    dotColorMax: {
      type: Number,
      default: 255
    },
    contentWidth: {
      type: Number,
      default: 120
    },
    contentHeight: {
      type: Number,
      default: 40
    }
  },
  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 + ")";
    },
    transparent() {
      return "rgb(255,255,255)";
    },
    drawPic() {
      let canvas = document.getElementById("s-canvas");
      let ctx = canvas.getContext("2d");
      ctx.textBaseline = "bottom";
      // Draw the background // ctx.fillStyle = this.randomColor(
      // this.backgroundColorMin,
      // this.backgroundColorMax
      // );
      ctx.fillStyle = this.transparent();
      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)
      // 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";
      let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1));
      let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5);
      var deg = this.randomNum(-10, 10);
      // Modify the coordinate origin and rotation angle ctx.translate(x, y);
      ctx.rotate((deg * Math.PI) / 180);
      ctx.fillText(txt, 0, 0);
      // Restore the coordinate origin and rotation angle ctx.rotate((-deg * Math.PI) / 180);
      ctx.translate(-x, -y);
    },
    drawLine(ctx) {
      // Draw interference lines 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>

4.Introduce the component on the page where you need the verification code and write the method:

<template>
<div class="get-code" @click="refreshCode()">
    <s-identify :identifyCode="identifyCode"></s-identify>
</div>
</template>
<script>
    import SIdentify from "@/components/sIdentify.vue";
    export default {
        components: { SIdentify },
        data() {
           return {
                identifyCode: "",
                identifyCodes: "0123456789abcdwerwshdjeJKDHRJHKOOPLMKQ", // just type it in}
        },
        methods: {            
           refreshCode() {//
             this.identifyCode = "";
             this.makeCode(this.identifyCodes,4);
           },
           randomNum (min, max) {
             max = max + 1
             return Math.floor(Math.random() * (max - min) + min)
           },
           // Randomly generate verification code string makeCode (data, len) {
             for (let i = 0; i < len; i++) {
             this.identifyCode += data[this.randomNum(0, data.length - 1)]
           }
        }
    }
</script>

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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