如何将OL3矢量切片与自定义地图投影配合使用

// 定义自定义地图投影
proj4.defs("custom-projection", "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs");

// 创建地图视图
var view = new ol.View({
  center: [0, 0],
  zoom: 2,
  projection: 'custom-projection'
});

// 加载矢量切片数据
var vectorSource = new ol.source.TileVector({
  url: 'http://example.com/tiles/{z}/{x}/{y}.pbf',
  format: new ol.format.MVT(),
  projection: 'custom-projection'
});

// 创建地图图层
var vectorLayer = new ol.layer.VectorTile({
  source: vectorSource
});

// 创建地图
var map = new ol.Map({
  target: 'map',
  view: view,
  layers: [vectorLayer]
});