在Open Layers 4中定義了getZoomForResolution嗎？如果是這樣，我如何才能使它工作？

Question

對於我的地圖應用程序，我想在不同的函數中使用ol.View.zoom-屬性以及ol.View.resolution屬性。根據Open Layers 4 API文檔，如果給出分辨率，縮放屬性將被忽略。 所以我想申請getZoomForResolution，這是這裏的API中記錄：

https://openlayers.org/en/latest/apidoc/ol.View.html#getZoomForResolution

這是一些測試代碼我使用：

var map, view; 
    //initial definition of the map 
    function initializeMap(){ 
     //define osm source and layer 
     var osmSource = new ol.source.OSM(); 
     var osmLayer = new ol.layer.Tile({source: osmSource}); 
     //define new map object 
     map = new ol.Map({ 
      target:'map', 
      view: new ol.View({ 
       center: ol.proj.fromLonLat([9.83276, 52.36554]), 
       resolution:300, // is required in some function 
       zoom:10 //ignored as expected according to API, also required in another function 
      }), 
      layers:[osmLayer] 
     }); 
     var currentResolution = map.getView().getResolution(); // returns 300 as expected 
     console.log(map.getView().getZoomForResolution(currentResolution)); 
    } 

不幸的是，我只收到錯誤「 map.getView（）。getZoomForResolution不是一個函數「。我也讀過this的帖子，但是它指的是OL 3，並沒有給出證據。

所以，我的問題是：是否getZoomForResolution函數不再實現？或者我嘗試訪問它的方式有錯誤嗎？

Answer 1

這裏工作得很好。 https://codepen.io/anon/pen/vePjxa?editors=1011

var osmSource = new ol.source.OSM(); 
    var osmLayer = new ol.layer.Tile({source: osmSource}); 
    //define new map object 
    map = new ol.Map({ 
     target:'map', 
     view: new ol.View({ 
      center: ol.proj.fromLonLat([9.83276, 52.36554]), 
      resolution:300, // is required in some function 
      zoom:10 //ignored as expected according to API, also required in another function 
     }), 
     layers:[osmLayer] 
    }); 
    var currentResolution = map.getView().getResolution(); // returns 300 as expected 
    console.log(map.getView().getZoomForResolution(currentResolution)); 

你有沒有工作的沙箱？