Vue verification code

1. Import sidentify.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: 25
    },
    fontSizeMax: {
      type: Number.default: 30
    },
    backgroundColorMin: {
      type: Number.default: 255
    },
    backgroundColorMax: {
      type: Number.default: 255
    },
    colorMin: {
      type: Number.default: 0
    },
    colorMax: {
      type: Number.default: 160
    },
    lineColorMin: {
      type: Number.default: 100
    },
    lineColorMax: {
      type: Number.default: 255
    },
    dotColorMin: {
      type: Number.default: 0
    },
    dotColorMax: {
      type: Number.default: 255
    },
    contentWidth: {
      type: Number.default: 112
    },
    contentHeight: {
      type: Number.default: 31}},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 the 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);
      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(-45.45);
      // Change the coordinates origin and rotation Angle
      ctx.translate(x, y);
      ctx.rotate((deg * Math.PI) / 180);
      ctx.fillText(txt, 0.0);
      // Restore the coordinates origin and rotation Angle
      ctx.rotate((-deg * Math.PI) / 180);
      ctx.translate(-x, -y);
    },
    drawLine(ctx) {
      // Draw interference lines
      for (let i = 0; i < 5; 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 < 80; 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>
<style scoped>
.s-canvas {
  height: 38px;
}
.s-canvas canvas {
  margin-top: 1px;
  margin-left: 8px;
}
</style>
Copy the code

2. Procedure

import SIdentify from "@/components/SIdentify";
components: {
    SIdentify
}
<s-identify
  class="identify"
  :identifyCode="identifyCode"
  @click.native="refreshCode"
></s-identify>

data(){
    return {
        identifyCodes: "1234567890"./ / random code
        identifyCode: "".// Generate random code
        code: "" // Text Specifies the verification code entered in the box}}// Initializes the verification code
mounted() {
    this.identifyCode = "";
    this.makeCode(this.identifyCodes, 4);
},

randomNum(min, max) {
  return Math.floor(Math.random() * (max - min) + min);
},
// Reset the verification code
refreshCode() {
  this.identifyCode = "";
  this.code = "";
  this.makeCode(this.identifyCodes, 4);
},
makeCode(o, l) {
  for (let i = 0; i < l; i++) {
    this.identifyCode += this.identifyCodes[
      this.randomNum(0.this.identifyCodes.length) ]; }},Copy the code