v3账号密码登录随机图片验证码

安装插件

pnpm i identify --save

图形验证码组件

<template>
  <div class="s-canvas">
    <!-- 图形验证码的宽和高都来自于父组件的传值，若父组件没有传值，那么就按当前子组件的默认值进行渲染 -->
    <canvas id="s-canvas" :width="props.contentWidth" :height="props.contentHeight"></canvas>
  </div>
</template>

<script setup>
import { onMounted, watch } from 'vue'

// 这里有很多属性值，需要自定义什么值就在父组件传对应参数即可
const props = defineProps({
  identifyCode: {
    type: String,
    default: '1234'
  },
  fontSizeMin: {
    type: Number,
    default: 20
  },
  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: 40
  },
  lineColorMax: {
    type: Number,
    default: 180
  },
  dotColorMin: {
    type: Number,
    default: 0
  },
  dotColorMax: {
    type: Number,
    default: 255
  },
  contentWidth: {
    type: Number,
    default: 71
  },
  contentHeight: {
    type: Number,
    default: 28
  }
})

// 生成一个随机数
const randomNum = (min, max) => {
  return Math.floor(Math.random() * (max - min) + min)
}

// 生成一个随机的颜色
const randomColor = (min, max) => {
  let r = randomNum(min, max)
  let g = randomNum(min, max)
  let b = randomNum(min, max)
  return 'rgb(' + r + ',' + g + ',' + b + ')'
}

// 绘制干扰线
const drawLine = (ctx) => {
  for (let i = 0; i < 3; i++) {
    ctx.strokeStyle = randomColor(props.lineColorMin, props.lineColorMax)
    ctx.beginPath()
    ctx.moveTo(randomNum(0, props.contentWidth), randomNum(0, props.contentHeight))
    ctx.lineTo(randomNum(0, props.contentWidth), randomNum(0, props.contentHeight))
    ctx.stroke()
  }
}

const drawText = (ctx, txt, i) => {
  ctx.fillStyle = randomColor(props.colorMin, props.colorMax)
  ctx.font = randomNum(props.fontSizeMin, props.fontSizeMax) + 'px SimHei'
  let x = (i + 1) * (props.contentWidth / (props.identifyCode.length + 1))
  let y = randomNum(props.fontSizeMax, props.contentHeight - 5)
  var deg = randomNum(-45, 45)
  // 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)
}

const drawDot = (ctx) => {
  // 绘制干扰点
  for (let i = 0; i < 30; i++) {
    ctx.fillStyle = randomColor(0, 255)
    ctx.beginPath()
    ctx.arc(randomNum(0, props.contentWidth), randomNum(0, props.contentHeight), 1, 0, 2 * Math.PI)
    ctx.fill()
  }
}

const drawPic = () => {
  let canvas = document.getElementById('s-canvas')
  let ctx = canvas.getContext('2d')
  ctx.textBaseline = 'bottom'
  // 绘制背景
  ctx.fillStyle = randomColor(props.backgroundColorMin, props.backgroundColorMax)
  ctx.fillRect(0, 0, props.contentWidth, props.contentHeight)
  // 绘制文字
  for (let i = 0; i < props.identifyCode.length; i++) {
    drawText(ctx, props.identifyCode[i], i)
  }
  drawLine(ctx)
  drawDot(ctx)
}

// newValue, oldValue
watch(
  () => props.identifyCode,
  () => {
    drawPic()
  }
)

onMounted(() => {
  drawPic()
})
</script>
<style scoped lang="scss">
.s-canvas {
  cursor: pointer;
}
</style>

父组件中使用

html部分：验证码输入框+图形验证码+提示

<el-form-item prop="password">
          <el-input
            v-model="verificationCode"
            class="elinput"
            placeholder="请输入验证码"
            prefix-icon="Key"
          />
        </el-form-item>
        <div
          style="
            text-align: right;
            margin-top: -10px;
            margin-bottom: 10px;
            position: relative;
            height: 40px;
          "
          @click="refreshCode"
        >
          <div style="position: absolute; border-radius: 5px; left: 1px">
            <randomImage
              :identify-code="identifyCode"
              :content-width="110"
              :content-height="40"
            ></randomImage>
          </div>
          <div style="position: absolute; left: 130px; bottom: -10px">
            <p style="font-size: 12px; color: #67c23a">看不清？点击图片可进行切换哦！</p>
          </div>
        </div>

ts部分：引入组件+对应参数定义+登录验证

// 图形验证码
import randomImage from './components/randomImage.vue'
// 验证码数字库
const identifyCodes = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ'
// 图形验证码图片中的验证码，用于校验
const identifyCode = ref('')
// 输入的验证码
const verificationCode = ref('')

const randomNum = (min: any, max: any) => {
  return Math.floor(Math.random() * (max - min) + min)
}

const makeCode = (o: any, l: any) => {
  for (let i = 0; i < l; i++) {
    identifyCode.value += o[randomNum(0, o.length)]
  }
}

const refreshCode = () => {
  identifyCode.value = ''
  makeCode(identifyCodes, 4)
}

// 登录提交按钮所触发的事件;前端先校验，无误后再走接口；有错误则提示对应错误
const onSubmit = (e: Event) => {
  e.preventDefault()
  if (verificationCode.value === identifyCode.value) {
    formRef.value?.validate((valid) => {
      if (valid) {
        loading.value = true
        userStore
          .login(form as any)
          .then(() => {
            ElMessage.success('登录成功')
            router.push('/workplace')
          })
          .finally(() => {
            loading.value = false
          })
      }
    })
  } else if (verificationCode.value === '') {
    ElNotification({
      title: '小提示',
      message: '请输入验证码',
      type: 'warning'
    })
    verificationCode.value = ''
    refreshCode()
  } else {
    ElNotification({
      title: '小提示',
      message: '验证码输入错误，请重新输入',
      type: 'error'
    })
    verificationCode.value = ''
    refreshCode()
  }
}

// 页面初始化时，执行一次逻辑生成图形验证码
onMounted(() => {
  identifyCode.value = ''
  makeCode(identifyCodes, 4)
})