在Web Worker中使用“Google Maps API”

Question

我正在嘗試在Javascript Web Worker中加載Google Maps API，但無法加載地圖庫。 Web Worker代碼如下所示：

importScripts('http://maps.googleapis.com/maps/api/js?libraries=geometry&key=MYAPIKEY&sensor=FALSE'); 

這很簡單

Script Error.

在我嘗試加載工作者時在Chrome中。

我假設地圖庫中的某些東西試圖訪問DOM。 但這只是猜測。 有沒有人有解決方案？

編輯：我打開上面的鏈接，並試圖提取+修改它的內容。 所以WebWorker.js現在看起來像這樣：

var window = {google: {}};
var google = {maps: {}};
(function() {

  function getScript(src) {
      importScripts(src);
    //document.write('<' + 'script src="' + src + '"><' + '/script>');
  }

  var modules = google.maps.modules = {};
  google.maps.__gjsload__ = function(name, text) {
    modules[name] = text;
  };

  google.maps.Load = function(apiLoad) {
    delete google.maps.Load;
    apiLoad([0.009999999776482582,[[["http://mt0.googleapis.com/vt?lyrs=m@306000000\u0026src=api\u0026hl=de-DE\u0026","http://mt1.googleapis.com/vt?lyrs=m@306000000\u0026src=api\u0026hl=de-DE\u0026"],null,null,null,null,"m@306000000",["https://mts0.google.com/vt?lyrs=m@306000000\u0026src=api\u0026hl=de-DE\u0026","https://mts1.google.com/vt?lyrs=m@306000000\u0026src=api\u0026hl=de-DE\u0026"]],[["http://khm0.googleapis.com/kh?v=174\u0026hl=de-DE\u0026","http://khm1.googleapis.com/kh?v=174\u0026hl=de-DE\u0026"],null,null,null,1,"174",["https://khms0.google.com/kh?v=174\u0026hl=de-DE\u0026","https://khms1.google.com/kh?v=174\u0026hl=de-DE\u0026"]],[["http://mt0.googleapis.com/vt?lyrs=h@306000000\u0026src=api\u0026hl=de-DE\u0026","http://mt1.googleapis.com/vt?lyrs=h@306000000\u0026src=api\u0026hl=de-DE\u0026"],null,null,null,null,"h@306000000",["https://mts0.google.com/vt?lyrs=h@306000000\u0026src=api\u0026hl=de-DE\u0026","https://mts1.google.com/vt?lyrs=h@306000000\u0026src=api\u0026hl=de-DE\u0026"]],[["http://mt0.googleapis.com/vt?lyrs=t@132,r@306000000\u0026src=api\u0026hl=de-DE\u0026","http://mt1.googleapis.com/vt?lyrs=t@132,r@306000000\u0026src=api\u0026hl=de-DE\u0026"],null,null,null,null,"t@132,r@306000000",["https://mts0.google.com/vt?lyrs=t@132,r@306000000\u0026src=api\u0026hl=de-DE\u0026","https://mts1.google.com/vt?lyrs=t@132,r@306000000\u0026src=api\u0026hl=de-DE\u0026"]],null,null,[["http://cbk0.googleapis.com/cbk?","http://cbk1.googleapis.com/cbk?"]],[["http://khm0.googleapis.com/kh?v=86\u0026hl=de-DE\u0026","http://khm1.googleapis.com/kh?v=86\u0026hl=de-DE\u0026"],null,null,null,null,"86",["https://khms0.google.com/kh?v=86\u0026hl=de-DE\u0026","https://khms1.google.com/kh?v=86\u0026hl=de-DE\u0026"]],[["http://mt0.googleapis.com/mapslt?hl=de-DE\u0026","http://mt1.googleapis.com/mapslt?hl=de-DE\u0026"]],[["http://mt0.googleapis.com/mapslt/ft?hl=de-DE\u0026","http://mt1.googleapis.com/mapslt/ft?hl=de-DE\u0026"]],[["http://mt0.googleapis.com/vt?hl=de-DE\u0026","http://mt1.googleapis.com/vt?hl=de-DE\u0026"]],[["http://mt0.googleapis.com/mapslt/loom?hl=de-DE\u0026","http://mt1.googleapis.com/mapslt/loom?hl=de-DE\u0026"]],[["https://mts0.googleapis.com/mapslt?hl=de-DE\u0026","https://mts1.googleapis.com/mapslt?hl=de-DE\u0026"]],[["https://mts0.googleapis.com/mapslt/ft?hl=de-DE\u0026","https://mts1.googleapis.com/mapslt/ft?hl=de-DE\u0026"]],[["https://mts0.googleapis.com/mapslt/loom?hl=de-DE\u0026","https://mts1.googleapis.com/mapslt/loom?hl=de-DE\u0026"]]],["de-DE","US",null,0,null,null,"http://maps.gstatic.com/mapfiles/","http://csi.gstatic.com","https://maps.googleapis.com","http://maps.googleapis.com",null,"https://maps.google.com","https://gg.google.com","http://maps.gstatic.com/maps-api-v3/api/images/","https://www.google.com/maps",0],["http://maps.gstatic.com/maps-api-v3/api/js/21/3/intl/de_ALL","3.21.3"],[141790386],1,null,null,null,null,null,"",["geometry"],null,0,"http://khm.googleapis.com/mz?v=174\u0026","AIzaSyDQi59vEjsIzBM-AFMeDbszVsOckQOb5A8","https://earthbuilder.googleapis.com","https://earthbuilder.googleapis.com",null,"http://mt.googleapis.com/vt/icon",[["http://mt0.googleapis.com/vt","http://mt1.googleapis.com/vt"],["https://mts0.googleapis.com/vt","https://mts1.googleapis.com/vt"],null,null,null,null,null,null,null,null,null,null,["https://mts0.google.com/vt","https://mts1.google.com/vt"],"/maps/vt",306000000,132],2,500,[null,"http://g0.gstatic.com/landmark/tour","http://g0.gstatic.com/landmark/config",null,"http://www.google.com/maps/preview/log204","","http://static.panoramio.com.storage.googleapis.com/photos/",["http://geo0.ggpht.com/cbk","http://geo1.ggpht.com/cbk","http://geo2.ggpht.com/cbk","http://geo3.ggpht.com/cbk"]],["https://www.google.com/maps/api/js/master?pb=!1m2!1u21!2s3!2sde-DE!3sUS!4s21/3/intl/de_ALL","https://www.google.com/maps/api/js/widget?pb=!1m2!1u21!2s3!2sde-DE"],null,0,0,"/maps/api/js/ApplicationService.GetEntityDetails",0], loadScriptTime);
  };

    importScripts(
    'http://maps.gstatic.com/maps-api-v3/api/js/21/3/intl/de_ALL/main.js'
    , 'http://maps.gstatic.com/maps-api-v3/api/js/21/3/intl/de_ALL/geometry.js'
    );

})();

但這仍然會導致“腳本錯誤”。

Answer 1

谷歌客戶端API如地圖，驅動器等需要dom元素，所以你不能在web worker中使用map api。 我在過去幾小時的研究中也遇到了類似的問題，我確認至少在目前還不能做到這一點。 關於web wroker，您需要了解以下幾點。

我們可以在Web worker中訪問的對象非常少：

XMLHttpRequest，JSON，Worker，導航器，位置，設置和清除超時，導入腳本，設置和清除間隔。

無法從Web worker訪問窗口或父級localStorage對象。

有關詳細信息，請查看此鏈接。

Answer 2

我實際上已經能夠通過欺騙工人認為有一個DOM對象供它使用來創建一個標記的實例。 我試圖在試圖在遇到同樣問題的工人中使用jQuery命令的人竊取了這個想法。 我的參考是從這里：

// create a fake document for jQuery to function - DOES NOT PROVIDE ACCESS TO ACTUAL DOM ELEMENTS
// from Tomáš Zato comment on http://stackoverflow.com/questions/10491448/how-to-access-jquery-in-html-5-web-worker
var document = self.document = {parentNode: null, nodeType: 9, toString:function() {return "FakeDocument"}};
var window = self.window = self;
var fakeElement = Object.create(document);
fakeElement.nodeType = 1;
fakeElement.toString=function() {return "FakeElement"};
fakeElement.parentNode = fakeElement.firstChild = fakeElement.lastChild = fakeElement;
fakeElement.ownerDocument = document;

document.head = document.body = fakeElement;
document.ownerDocument = document.documentElement = document;
document.getElementById = document.createElement = function() {return fakeElement;};
document.createDocumentFragment = function() {return this;};
document.getElementsByTagName = document.getElementsByClassName = function() {return [fakeElement];};
document.getAttribute = document.setAttribute = document.removeChild =
  document.addEventListener = document.removeEventListener =
  function() {return null;};
document.cloneNode = document.appendChild = function() {return this;};
document.appendChild = function(child) {return child;};