javascript - 制作 Leaflet 地图时出现“t is undefined”错误？

Question

当我单击“resetMap”按钮时，我的 WebConsole 告诉我“t 未定义”。这是 resetMap 函数的 javascript

function resetMap() {

    /* This creates a variable which groups the layers.
    */

    var layerGroup = L.layerGroup([Frog1Layer, Frog2Layer, Frog3Layer, Frog4Layer, Frog5Layer, Frog6Layer, Frog7Layer, Frog8Layer]);


    /* This removes the variable layerGroup from the map.
    */

    map.removeLayer(layerGroup);

    /* This changes the map centre & zoom level to default.
    */

    map.setView(new L.LatLng(0,0), 1);
}

这是控制台中的错误

TypeError: t is undefinedleaflet.js:5:652

u https://unpkg.com/leaflet@1.5.1/dist/leaflet.js:5

getLayerId https://unpkg.com/leaflet@1.5.1/dist/leaflet.js:5

addLayer https://unpkg.com/leaflet@1.5.1/dist/leaflet.js:5

initialize https://unpkg.com/leaflet@1.5.1/dist/leaflet.js:5

i https://unpkg.com/leaflet@1.5.1/dist/leaflet.js:5

layerGroup https://unpkg.com/leaflet@1.5.1/dist/leaflet.js:5

resetMap file:///F:/GIS Assessment 1/MyScript.js:247

onclick file:///F:/GIS Assessment 1/MyHTML.html:1

我该如何解决？

标签： javascriptleafletundefined

Answer 1

错误描述应该非常准确：您的图层之一未定义。

但是，您可以跳过创建图层组：

let layers = [Frog1Layer, Frog2Layer, Frog3Layer, Frog4Layer, Frog5Layer, Frog6Layer, Frog7Layer, Frog8Layer]

for (let layer of layers) {
  if (layer) {
    map.removeLayer(layer)
  }
}