如何使用Vue和ECharts4Taro3创建动态图表效果

npm install taro-vue@next echarts-for-taro@next

<template>
  <taro-echarts :ec="ec"></taro-echarts>
</template>

<script>
import Taro from '@tarojs/taro'
import { ref, onMounted } from 'vue'
import * as echarts from 'echarts/core'
import { BarChart } from 'echarts/charts'
import { GridComponent, TitleComponent } from 'echarts/components'
import { CanvasRenderer } from 'echarts/renderers'

echarts.use([BarChart, GridComponent, TitleComponent, CanvasRenderer])

export default {
  setup() {
    const ec = ref(null)

    onMounted(() => {
      // 初始化图表
      const chart = echarts.init(ec.value)
      // 配置项
      const option = {
        // ...具体配置项...
      }
      // 将配置项设置到图表中
      chart.setOption(option)
    })

    return {
      ec,
    }
  },
}
</script>

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

export default {
  // ...
  setup() {
    // ...

    // 模拟动态数据
    const data = ref([10, 20, 30, 40, 50])

    const option = computed(() => ({
      // 设置图表数据
      series: [
        {
          type: 'bar',
          data: data.value,
        },
      ]
    }))

    watch(data, () => {
      // 图表数据改变时更新图表
      chart.setOption(option.value)
    })

    return {
      // ...
    }
  },
}
</script>

<template>
  <view class="container">
    <Chart />
    <button @click="updateData">更新数据</button>
  </view>
</template>

<script>
import { ref } from 'vue'
import Chart from '@/components/Chart.vue'

export default {
  components: {
    Chart,
  },
  setup() {
    const data = ref([10, 20, 30, 40, 50])

    const updateData = () => {
      // 模拟数据更新
      data.value = data.value.map((item) => item * Math.random())

      // 或者通过接口请求数据
      // fetch('/api/data').then((response) => {
      //   data.value = response.data
      // })
    }

    return {
      updateData,
    }
  },
}
</script>