用vue写一个表单将查询数据通过mqtt下发并渲染到轮播表里

由于缺少具体的数据和mqtt服务信息，以下代码仅为示例代码，需要根据实际情况进行修改。

1. 安装所需依赖

npm install vue mqtt --save

2. 创建组件

<template>
  <div>
    <form @submit.prevent="handleSubmit">
      <input type="text" v-model="query" placeholder="输入查询条件">
      <button type="submit">查询</button>
    </form>
    <div v-if="loading">加载中...</div>
    <div v-else-if="error">{{ error }}</div>
    <div v-else>
      <div v-for="(item, index) in data" :key="index">
        <h3>{{ item.title }}</h3>
        <p>{{ item.content }}</p>
      </div>
      <div v-if="data.length === 0">暂无数据</div>
      <carousel :data="data"></carousel>
    </div>
  </div>
</template>

<script>
import mqtt from 'mqtt'
import Carousel from './Carousel.vue'

export default {
  components: {
    Carousel
  },
  data() {
    return {
      query: '',
      loading: false,
      error: '',
      data: []
    }
  },
  methods: {
    handleSubmit() {
      this.loading = true
      this.error = ''
      this.data = []
      const client = mqtt.connect('wss://mqtt.example.com') // mqtt服务地址
      client.on('connect', () => {
        client.subscribe('query/result', (err) => {
          if (err) {
            this.loading = false
            this.error = err.message
            return
          }
          client.publish('query', JSON.stringify({ query: this.query }))
        })
      })
      client.on('message', (topic, message) => {
        if (topic === 'query/result') {
          this.loading = false
          this.data = JSON.parse(message.toString())
        }
        client.end()
      })
    }
  }
}
</script>

3. 创建轮播表组件

<template>
  <div>
    <div v-if="data.length === 0">暂无数据</div>
    <div v-else>
      <div v-for="(item, index) in data" :key="index" v-show="currentIndex === index">
        <h3>{{ item.title }}</h3>
        <p>{{ item.content }}</p>
      </div>
      <div class="indicators">
        <span v-for="(item, index) in data" :key="index" :class="{ active: currentIndex === index }" @click="handleChange(index)"></span>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  props: {
    data: {
      type: Array,
      default() {
        return []
      }
    }
  },
  data() {
    return {
      currentIndex: 0
    }
  },
  mounted() {
    this.timer = setInterval(() => {
      this.currentIndex++
      if (this.currentIndex >= this.data.length) {
        this.currentIndex = 0
      }
    }, 3000)
  },
  beforeDestroy() {
    clearInterval(this.timer)
  },
  methods: {
    handleChange(index) {
      this.currentIndex = index
    }
  }
}
</script>

4. 在入口文件中注册组件

import Vue from 'vue'
import App from './App.vue'

Vue.config.productionTip = false

new Vue({
  render: h => h(App)
}).$mount('#app')

5. 编写样式

.indicators {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
}

.indicators span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #999;
  margin-right: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.indicators span.active {
  background-color: #333;
  transform: scale(1.2);
}

以上示例代码仅供参考，实际使用中还需要根据具体需求进行修改和完善。