vue OpenLayer 标注静止overlay

以下是Vue OpenLayers标注静止overlay的方法：

<template>
  <div>
    <div id="map" style="height: 500px;"></div>
  </div>
</template>

<script>
import Map from "ol/Map";
import Overlay from "ol/Overlay";
import View from "ol/View";
import TileLayer from "ol/layer/Tile";
import OSM from "ol/source/OSM";

export default {
 name: "Map",
  data() {
    return {
      map: null,
      overlay: null,
    };
  },
  mounted() {
    this.initMap();
  },
  methods: {
    initMap() {
      // 创建地图容器
      this.map = new Map({
        target: "map",
        layers: [
          new TileLayer({
            source: new OSM(),
          }),
        ],
        view: new View({
          center: [0, 0],
          zoom: 2,
        }),
      });

      // 创建overlay
      this.overlay = new Overlay({
        element: document.getElementById("overlay"),
        autoPan: true,
        autoPanAnimation: {
          duration: 250,
        },
      });

      // 将overlay添加到地图中
      this.map.addOverlay(this.overlay);

      // 弹窗关闭事件
      const closer = document.getElementById("popup-closer");
      closer.onclick = () => {
        this.overlay.setPosition(undefined);
        closer.blur();
        return false;
      };

      // 点击地图事件
      this.map.on("click", (evt) => {
        // 获取点击位置坐标
        const coordinate = evt.coordinate;

        // 设置overlay的位置
        this.overlay.setPosition(coordinate);
      });
    },
  },
};
</script>

<style>
.ol-popup {
  position: absolute;
  background-color: white;
  -webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
  filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
  padding: 15px;
  border-radius: 10px;
  border: 1px solid #cccccc;
  bottom: 12px;
  left: -50px;
  min-width: 280px;
}

.ol-popup:after,
.ol-popup:before {
  top: 100%;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
}

.ol-popup:after {
  border-top-color: white;
  border-width: 10px;
  left: 48%;
  margin-left: -10px;
}

.ol-popup:before {
  border-top-color: #cccccc;
  border-width: 11px;
  left: 48%;
  margin-left: -11px;
}
</style>

<template>
  <div id="overlay" class="ol-popup">
    <a href="#" id="popup-closer" class="ol-popup-closer"></a>
    <div>这是一个静止的overlay</div>
  </div>
</template>