的Javascript只执行Deferred2，不也推迟

Question

我要的是，我要开，我使用的值从2角不同的IdentifyTask秒的信息窗口：

这里是我的代码：

dojo.connect(map, "onClick", executeIdentifyTask); 

identifyTask = new esri.tasks.IdentifyTask("https://server.com/ArcGIS/rest/services/POI_Data/MapServer"); 

identifyTask2 = new esri.tasks.IdentifyTask("https://server.com/ArcGIS/rest/services/ProRail_Data/MapServer"); 

identifyParams = new esri.tasks.IdentifyParameters(); 
identifyParams.tolerance = 15; 
identifyParams.returnGeometry = true; 
identifyParams.layerIds = [0]; 
identifyParams.layerOption = esri.tasks.IdentifyParameters.LAYER_OPTION_ALL; 
identifyParams.width = map.width; 
identifyParams.height = map.height; 

identifyParams2 = new esri.tasks.IdentifyParameters(); 
identifyParams2.tolerance = 10; 
identifyParams2.returnGeometry = true; 
identifyParams.layerIds = [23, 26, 31, 33]; 
identifyParams2.layerOption = esri.tasks.IdentifyParameters.LAYER_OPTION_ALL; 
identifyParams2.width = map.width; 
identifyParams2.height = map.height; 

function executeIdentifyTask(evt) { 

    identifyParams.geometry = evt.mapPoint; 
    identifyParams.mapExtent = map.extent; 
    var deferred = identifyTask.execute(identifyParams); 
    identifyParams2.geometry = evt.mapPoint; 
    identifyParams2.mapExtent = map.extent; 

    var deferred2 = identifyTask2.execute(identifyParams2); 

    deferred.addCallback(function (response) { 
     // response is an array of identify result objects  
     // Let's return an array of features. 
     return dojo.map(response, function (result) { 
      var feature = result.feature; 
      feature.attributes.layerName = result.layerName; 
      if (result.layerName === 'Spoortoegang') { 
       console.log(feature.attributes.PARCELID); 
       var template = new esri.InfoTemplate("ToegangsNummer ${ToegangsNr}", "Toegangsnummer ${ToegangsNr} <br/> Baanvak: ${Baanvak}, <br/> Geocode: ${Geocode}, <br/> Kilometer: ${Kilometrering}"); 
       feature.setInfoTemplate(template); 
       alert("Spoortoegang"); 
      } 
      else if (result.layerName === 'sein') { 
       var template = new esri.InfoTemplate("", "Parcel ID: ${NUMMER}"); 
       feature.setInfoTemplate(template); 
      } 
      return feature; 
     }); 
    }); 

    deferred2.addCallback(function (response) { 
     // response is an array of identify result objects  
     // Let's return an array of features. 
     return dojo.map(response, function (result) { 
      var feature = result.feature; 
      feature.attributes.layerName = result.layerName; 
      if (result.layerName === 'Wissels') { 
       console.log(feature.attributes.PARCELID); 
       var template = new esri.InfoTemplate("Wissel", "Toegangsnummer ${ToegangsNr} <br/> Baanvak: ${Baanvak}, <br/> Geocode: ${Geocode}, <br/> Kilometer: ${Kilometrering}"); 
       feature.setInfoTemplate(template); 
       alert("Wissels"); 

      } 
      else if (result.layerName === 'sein') { 
       var template = new esri.InfoTemplate("", "Sein Nummer: ${NUMMER}"); 
       feature.setInfoTemplate(template); 
       alert("sein"); 
      } 
      else if (result.layerName === 'Sporen') { 
       console.log(feature.attributes.PARCELID); 
       var template = new esri.InfoTemplate("Wissel", "Toegangsnummer ${ToegangsNr} <br/> Baanvak: ${Baanvak}, <br/> Geocode: ${Geocode}, <br/> Kilometer: ${Kilometrering}"); 
       feature.setInfoTemplate(template); 
       alert("Sporen"); 
      } 
      else if (result.layerName === 'bovenleidingpaal') { 
       console.log(feature.attributes.PARCELID); 
       var template = new esri.InfoTemplate("Wissel", "Toegangsnummer ${ToegangsNr} <br/> Baanvak: ${Baanvak}, <br/> Geocode: ${Geocode}, <br/> Kilometer: ${Kilometrering}"); 
       feature.setInfoTemplate(template); 
       alert("bovenleidingspaal"); 
      } 

      return feature; 
     }); 
    }); 


    // InfoWindow expects an array of features from each deferred 
    // object that you pass. If the response from the task execution 
    // above is not an array of features, then you need to add a callback 
    // like the one above to post-process the response and return an 
    // array of features. 
    map.infoWindow.resize(195, 75); 
    map.infoWindow.setFeatures([deferred]); 
    map.infoWindow.show(evt.mapPoint); 

    map.infoWindow.resize(195, 75); 
    map.infoWindow.setFeatures([deferred2]); 
    map.infoWindow.show(evt.mapPoint); 
} 

我仅从deferred2得到警报和infowindow内容，而不是deferred

Answer 1

任何你可以缩短代码deferred2：

deferred2.addCallback(function (response) { 
    // response is an array of identify result objects  
    // Let's return an array of features. 
    return dojo.map(response, function (result) { 
     var feature = result.feature; 
     feature.attributes.layerName = result.layerName; 
     var template; 
     switch(result.layerName){ 
      case 'Wissels': 
      case 'Sporen': 
      case 'bovenleidingpaal': 
       template = new esri.InfoTemplate("Wissel", "Toegangsnummer ${ToegangsNr} <br/> Baanvak: ${Baanvak}, <br/> Geocode: ${Geocode}, <br/> Kilometer: ${Kilometrering}"); 
      break; 
      case 'sein': 
       var template = new esri.InfoTemplate("", "Sein Nummer: ${NUMMER}"); 
      break; 
     } 
     console.log(feature.attributes.PARCELID); 
     feature.setInfoTemplate(template); 
     alert(result.layerName); 

     return feature; 
    }); 
}); 

这应该是相同的。