Javascript 清除传单地图中的所有折线
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Clear all polylines from leaflet map
提问by Vince Lowe
I am struggling to clear all polylines from my map, i only clear the newest.
我正在努力清除地图上的所有折线，我只清除最新的。
var polylines;
// add map polylines
function addPolyline(polyArray, colour) {
polylines = L.polyline(polyArray, {color: colour});
polylines.addTo(map);
}
// clear polylines
function clearPolylines() {
map.removeLayer(polylines);
}
where addPolylines is called multiple times and clear Polylines is called once. How can i clear all polylines on the map?
其中 addPolylines 被多次调用， clear Polylines 被调用一次。如何清除地图上的所有折线？
回答by flup
You'll have to remember them all or cheat a bit and peek into map._layersto find them.
您必须全部记住它们或作弊并偷看map._layers以找到它们。
EDIT adding sample code by @Ben:
编辑通过@Ben 添加示例代码：
function clearMap() {
for(i in m._layers) {
if(m._layers[i]._path != undefined) {
try {
m.removeLayer(m._layers[i]);
}
catch(e) {
console.log("problem with " + e + m._layers[i]);
}
}
}
}
回答by Mike K.
The following will remove both polygons and markers but keep the image tiles in the background:
以下将删除多边形和标记，但将图像图块保留在背景中：
for (i in map._layers) {
if (map._layers[i].options.format == undefined) {
try {
map.removeLayer(map._layers[i]);
} catch (e) {
console.log("problem with " + e + map._layers[i]);
}
}
}
