<div id="app">
  <l-map :bounds="bounds" style="position: absolute; top: 0;right: 0; bottom: 0; left: 0;">
    <l-tile-layer :url="tileurl"></l-tile-layer>
    <l-marker v-for="item in items" :lat-lng="{lat: item['緯度'], lon: item['経度'] }">
      <l-popup>
        {{ item['施設名'] }}
      </l-popup>
    </l-marker>
  </l-map>
</div>

Vue.component("l-map", window.Vue2Leaflet.LMap);
Vue.component("l-tile-layer", window.Vue2Leaflet.LTileLayer);
Vue.component("l-marker", window.Vue2Leaflet.LMarker);
Vue.component("l-popup", window.Vue2Leaflet.LPopup);
new Vue({
  el: "#app",
  data() {
    return {
      items: [],
      tileurl: "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
      bounds: null
    };
  },
  mounted() {
    var self = this;
    axios
      .get("https://www.city.shinagawa.tokyo.jp/ct/other000081600/toilet.csv", {
        responseType: "arraybuffer",
        transformResponse: function (data) {
          // shift_jis to utf8
          return new TextDecoder("sjis").decode(data);
        }
      })
      .then(function (response) {
        const parsed = Papa.parse(response.data, {
          header: true,
          skipEmptyLines: true
        });
        self.items = parsed.data;
        self.items.forEach(function (item) {
          self.setBounds(+item["緯度"], +item["経度"]);
        });
      })
      .catch(function (error) {
        console.log(error);
      });
  },
  methods: {
    setBounds: function (lat, long) {
      if (!this.bounds)
        this.bounds = [
          [lat, long],
          [lat, long]
        ];
      if (this.bounds[1][0] > lat) this.bounds[1][0] = lat;
      if (this.bounds[0][0] < lat) this.bounds[0][0] = lat;
      if (this.bounds[1][1] > long) this.bounds[1][1] = long;
      if (this.bounds[0][1] < long) this.bounds[0][1] = long;
    }
  }
});