vue项目中随机生成验证码

效果：

 过程：

1.下载identify插件，命令：npm i identify

2.在你的components目录新建一个vue组件，我的命名是：sIdentify.vue

3.在组件内把下面的代码copy过去

<template>
  <div class="s-canvas">
    <canvas id="s-canvas" :width="contentWidth" :height="contentHeight" />
  </div>
</template>
<script>
export default {
  name: 'SIdentify',
  props: {
    identifyCode: { // 默认注册码
      type: String,
      default: '1234'
    },
    fontSizeMin: { // 字体最小值
      type: Number,
      default: 25
    },
    fontSizeMax: { // 字体最大值
      type: Number,
      default: 35
    },
    backgroundColorMin: { // 验证码图片背景色最小值
      type: Number,
      default: 200
    },
    backgroundColorMax: { // 验证码图片背景色最大值
      type: Number,
      default: 220
    },
    colorMin: {
      type: Number,
      default: 50
    },
    colorMax: {
      type: Number,
      default: 160
    },
    lineColorMin: {
      type: Number,
      default: 100
    },
    lineColorMax: {
      type: Number,
      default: 200
    },
    dotColorMin: { // 背景干扰点最小值
      type: Number,
      default: 0
    },
    dotColorMax: { // 背景干扰点最大值
      type: Number,
      default: 255
    },
    contentWidth: { // 容器宽度
      type: Number,
      default: 120
    },
    contentHeight: { // 容器高度
      type: Number,
      default: 40
    }
  },
  watch: {
    identifyCode() {
      this.drawPic()
    }
  },
  mounted() {
    this.drawPic()
  },
  methods: {
    // 生成一个随机数
    randomNum(min, max) {
      return Math.floor(Math.random() * (max - min) + min)
    },
    // 生成一个随机的颜色
    randomColor(min, max) {
      const r = this.randomNum(min, max)
      const g = this.randomNum(min, max)
      const b = this.randomNum(min, max)
      return 'rgb(' + r + ',' + g + ',' + b + ')'
    },
    drawPic() {
      const canvas = document.getElementById('s-canvas')
      const ctx = canvas.getContext('2d')
      ctx.textBaseline = 'bottom'
      // 绘制背景
      ctx.fillStyle = this.randomColor(
        this.backgroundColorMin,
        this.backgroundColorMax
      )
      ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
      // 绘制文字
      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'
      const x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
      const y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
      var deg = this.randomNum(-30, 30)
      // 修改坐标原点和旋转角度
      ctx.translate(x, y)
      ctx.rotate((deg * Math.PI) / 180)
      ctx.fillText(txt, 0, 0)
      // 恢复坐标原点和旋转角度
      ctx.rotate((-deg * Math.PI) / 180)
      ctx.translate(-x, -y)
    },
    drawLine(ctx) {
      // 绘制干扰线
      for (let i = 0; i < 4; 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) {
      // 绘制干扰点
      for (let i = 0; i < 30; 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()
      }
    }
  }
}
</script>

4.在你需要验证码的页面引入组件并写好方法：

<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",//随便打的
            }
        },
        methods: {            
           refreshCode() {//
             this.identifyCode = "";
             this.makeCode(this.identifyCodes,4);
           },
           randomNum (min, max) {
             max = max + 1
             return Math.floor(Math.random() * (max - min) + min)
           },
           // 随机生成验证码字符串
           makeCode (data, len) {
             for (let i = 0; i < len; i++) {
             this.identifyCode += data[this.randomNum(0, data.length - 1)]
           }
        }
    }
</script>

下载identify插件，命令：npm i identify