https://github.com/Leaflet/Leaflet.Editable
http://leaflet.github.io/Leaflet.Editable/doc/api.html
注意<script>引入的顺序
<head>
<script src="Leaflet.Editable/src/Leaflet.Editable.js"></script>
</head>
function on_property_show_sel_line(){
core_mymap.on('editable:drawing:start', function (e) {
});
core_mymap.on('editable:drawing:commit', function (e) {
core_mymap.removeLayer(e.layer)
});
core_mymap.editTools.startPolyline()
}