搭建Vite项目

使用vite创建vue-ts项目

兼容性注意
Vite 需要 Node.js 版本 >= 12.0.0。

此处使用 pnpm 构建项目，npm及yarn请查看官方文档。

pnpm create vite my-vue-app -- --template vue-ts

使用vscode打开项目，新建终端，执行 pnpm install 或 pnpm i 安装依赖。执行 pnpm run dev 或 pnpm dev 运行项目：

安装ECharts并绘制基础折线图

通过pnpm安装ECharts，当前版本为5.3.2

pnpm add echarts

引入ECharts

<script setup lang="ts">
import { onMounted } from 'vue';
import { EChartsOption, init } from 'echarts';

onMounted(() => {
  // 获取dom，断言HTMLElement类型，否则会报错
  const chartEle: HTMLElement = document.getElementById('chart') as HTMLElement;
  const chart = init(chartEle);
  const option: EChartsOption = {
    xAxis: {
      type: 'category',
      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
      type: 'value'
    },
    series: [
      {
        data: [150, 230, 224, 218, 135, 147, 260],
        type: 'line'
      }
    ]
  };
  option && chart.setOption(option);
})
</script>

<template>
  <div id="chart"></div>
</template>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}

#chart {
  width: 600px;
  height: 400px;
}
</style>

完成，效果图如下：

2022-08-15更新：ref用法（推荐）

<script setup lang="ts">
import { onMounted, Ref, ref } from 'vue'
import { ECharts, EChartsOption, init } from 'echarts'

let chart: ECharts;
const chartRef: Ref<HTMLElement | null> = ref(null)

const initChart = () => {
  const option: EChartsOption = {
    xAxis: {
      type: 'category'
    },
    yAxis: {
      type: 'value'
    },
    series: [
      {
        type: 'line'
      }
    ]
  };
  chart.setOption(option);
}
const updateChart = () => {
  const option: EChartsOption = {
    xAxis: {
      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    series: [
      {
        data: [150, 230, 224, 218, 135, 147, 260]
      }
    ]
  };
  chart.setOption(option);
}

onMounted(() => {
  chart = init(chartRef.value as HTMLElement)
  initChart()
  // 延时2秒后执行增量更新
  setTimeout(() => {
    updateChart()
  }, 2000)
})
</script>

<template>
  <div class="chart" ref="chartRef"></div>
</template>

<style scoped>
.chart {
  width: 100%;
  height: 400px;
}
</style>

2022-12-12更新：定时重载图表

<script setup lang="ts">
import { onMounted, onUnmounted, Ref, ref } from 'vue'
import { ECharts, EChartsOption, init } from 'echarts'

let chart: ECharts;
const chartRef: Ref<HTMLElement | null> = ref(null)
// 初始化图表
const initChart = () => {
  const option: EChartsOption = {
    xAxis: {
      type: 'category'
    },
    yAxis: {
      type: 'value'
    },
    series: [
      {
        type: 'line'
      }
    ]
  };
  chart.setOption(option);
}
// 更新图表
const updateChart = () => {
  const option: EChartsOption = {
    xAxis: {
      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    series: [
      {
        data: [150, 230, 224, 218, 135, 147, 260]
      }
    ]
  };
  chart.setOption(option);
}
// 声明定时器
let interval: number | null = null;
onMounted(() => {
  chart = init(chartRef.value as HTMLElement)
  initChart()
  // 延时2秒后执行增量更新
  setTimeout(() => {
    updateChart()
  }, 2000)
  // 添加定时器，每隔5秒重新渲染图表
  interval = setInterval(() => {
    chart.clear()
    initChart()
    updateChart()
  }, 5000)
})
// 卸载组件时清除定时器
onUnmounted(() => {
  interval && clearInterval(interval)
})
</script>

<template>
  <div class="chart" ref="chartRef"></div>
</template>

<style scoped>
.chart {
  width: 370px;
  height: 400px;
}
</style>