Openlayers 在地图框js上使用图层组

我正在学习javascript，并开始胡乱处理mapbox.js示例：

这是在我的头上做的

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我想做的是一次点击就可以添加线条和标记。我如何定义和使用群组？

我收到了mapbox的员工发来的一封电子邮件，我可以更改代码并使用群组

    //Create variables
var map = L.mapbox.map('map','lucamoiana.i2f5jfg2').setView([45.642, 8.954], 14);
var ristori = L.mapbox.featureLayer('lucamoiana.i09fgicl');
var corto = L.mapbox.tileLayer('lucamoiana.i057npjm');
var corto_ristoro = L.mapbox.featureLayer('lucamoiana.i057npjm');
var medio = L.mapbox.tileLayer('lucamoiana.i0588kkf');
var medio_ristoro = L.mapbox.featureLayer('lucamoiana.i0588kkf');
var lungo = L.mapbox.tileLayer('lucamoiana.i058i92l');
var lungo_ristoro = L.mapbox.featureLayer('lucamoiana.i058i92l');
var parcheggi = L.mapbox.featureLayer('lucamoiana.i2f34pn3');

//addLayer
addLayer(L.mapbox.featureLayer('lucamoiana.i2f34pn3'), 'Parcheggi', 1);

//addGroup
addLayer(L.layerGroup([corto, corto_ristoro]), '6 Km', 5);
addLayer(L.layerGroup([medio, corto_ristoro, medio_ristoro]), '14 Km', 4);
addLayer(L.layerGroup([lungo, corto_ristoro, lungo_ristoro]), '20 Km', 3);