子组件

<template>
  <div class="s-canvas" style="height: 52px;">
    <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: 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: 52
      }
    },
    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) {
        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'
        // 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) // 绘制干扰线
        // this.drawDot(ctx) // 绘制干扰点
      },
      // 绘制文本
      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) // 字符旋转角度(不超过45度比较好)
        // 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 < 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) {
        // 绘制干扰点
        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>

父组件

<!-- 登陆页面 -->
<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">
      <el-form-item style="border: none;">
        <span class="svg-container">
          <svg-icon icon-class="captcha" style="color: #5DD5C8;" />
        </span>
        <el-input
          v-model="verificationCode"
          type="text"
          size="small"
          placeholder="请输入验证码"
          maxlength="4"
          style="background-color: #E5E5E5!important;width: 300px;"
          autocomplete="false"
        />
        <div @click="refreshCode()" class="verifiCode" title="点击切换验证码">
          <s-identify :identifyCode="identifyCode"></s-identify>
        </div>
      </el-form-item>
      <div style="font-size: 14px;color: #666;margin-bottom: 20px;">
        <el-checkbox v-model="memorize">记住密码</el-checkbox>
      </div>
      <el-button :loading="loading" type="primary" style="width:100%;margin-bottom:30px;background-color: #5DD5C8;border: none;" @click.native.prevent="handleLogin">登录</el-button>
    </el-form>
    <div class="login-bg" />
  </div>
</template>

<script>
import sIdentify from "./captcha.vue"
export default {
  components: { sIdentify },
  data() {
    return {
      verificationCode: '',
      identifyCode: "",
      identifyCodes: ['2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','j','k','m','n','p','q','r','s','t','w'], //根据实际需求加入自己想要的字符
    }
  },
  mounted() {
    this.refreshCode()
  },
  methods: {
    // 生成随机数
    randomNum(min, max) {
      max = max + 1
      return Math.floor(Math.random() * (max - min) + min);
    },
    // 更新验证码
    refreshCode() {
      this.identifyCode = "";
      this.makeCode(this.identifyCodes, 5)
    },
    // 随机生成验证码字符串
    makeCode(data, len) {
      for (let i = 0; i < len; i++) {
        this.identifyCode += this.identifyCodes[this.randomNum(0, this.identifyCodes.length-1)]
      }
    },
    handleLogin() {
      if (this.verificationCode !== this.identifyCode) {
        this.$message.warning('验证码错误')
        this.refreshCode()
        return
      }
      this.$refs.loginForm.validate(valid => {
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.verifiCode{
  background-color: #fff;
  padding-left: 20px;
  display: inline-block;
  height: 52px;
  cursor:pointer;
  position: absolute;
  right: 0px;
  top: 0px;
}
</style>

效果还行把

QQ20240925-154956.png