vue3+Echarts页面加载不渲染显示空白页面的解决

```javascript
 <!--入驻统计折线图-->
  <hostLine ref="settled" :settledData="settledData">   </hostLine>
  // 获取入驻统计
   async getSettledData() {
        const result = await getProjectSettled();
        // 如果后台返回的数据是空 前端就渲染一个空表出来 必须等获取到数据以后在渲染 Echarts
        if (result.success) {
          if (result.data.companyCount.length === 0 && result.data.stationCount.length === 0) {
            Object.assign(data.settledData);
          } else {
            Object.assign(data.settledData, result.data);
          }
          update.value = new Date().getTime();
        }
      },

<template>
  <div class="line-overview">
    <div class="host-line">
      <div class="host-line-title">入驻统计</div>
      <div id="hostLine" style="width: 100%; height: 360px"></div>
    </div>
  </div>
</template>
<script lang="ts">
import * as echarts from "echarts/core";
import { TooltipComponent, LegendComponent, GridComponent, } from 'echarts/components';
import { LineChart } from 'echarts/charts';
import { CanvasRenderer } from 'echarts/renderers';
import { UniversalTransition } from 'echarts/features';
import { defineComponent, inject, watch, onMounted, onUnmounted, ref, shallowRef, nextTick  } from "vue";
echarts.use([
  TooltipComponent,
  LegendComponent,
  GridComponent,
  LineChart,
  CanvasRenderer,
  UniversalTransition
]);
export default defineComponent({
  props: ["settledData"],
  setup(props) {
    const update = inject("update");
    const LineChart = shallowRef();
    const drawChart = () => {
      const cahrtData = props.settledData;
      LineChart.value = echarts.init(document.getElementById("hostLine") as HTMLElement);
      // 指定图表的配置项和数据
      let option = {
        tooltip: {
          trigger: "axis",
        },
        legend: {
          data: ['企业数量', '工位数量',]
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true,
        },
        xAxis: {
          type: "category",
          boundaryGap: false,
          data: cahrtData?.date.reverse()
        },
        // Y标尺固定
        yAxis: {
            type: "value",
            scale: true,
            // // boundaryGap: [0.2, 0.2],
            // // 动态设置Y轴的刻度值 只取整数
            min: (value:Record<string,number>) => {
              return Math.floor(value.min / 100) * 100;
            },
            max: (value:Record<string,number>) => {
              return Math.ceil(value.max / 100) * 100;
            },
        },
        series: [
          {
            name: "企业数量",
            type: "line",
            stack: "Total",
            data: cahrtData?.companyCount,
          },
          {
            name: "工位数量",
            type: "line",
            stack: "Total",
            data: cahrtData?.stationCount,
          },
        ],
      };
      // 使用刚指定的配置项和数据显示图表。
      LineChart.value.setOption(option);
      window.addEventListener("resize", () => {
        LineChart.value.resize();
      });
    };
    onMounted(() => {
      watch([update], () => {
        nextTick(()=>{
          drawChart();
        })
      }, {
        deep: true
      })
    });
    onUnmounted(() => {
      LineChart.value.dispose();
    });
  },
});
</script>

<div class="echarts-vue" style="width:500px; height:500px" ></div>