Intro to layers

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Intro to layers-4.10</title>
<link rel="stylesheet" type="text/css" href="https://js.arcgis.com/4.10/esri/css/main.css">
<style>
     html,body,#viewDiv {
       padding: 0;
       margin: 0;
       height: 100%;
       width: 100%;
     }
     #layerToggle {
     top: 20px;
      right: 20px;
      position: absolute;
      z-index: 99;
      background-color: white;
      border-radius: 8px;
      padding: 10px;
      opacity: 0.75;
     }
</style>
<script type="text/javascript" src="https://js.arcgis.com/4.10/"></script>
<script type="text/javascript">
  require([
   "esri/Map",
   "esri/layers/TileLayer",
   "esri/views/SceneView"
   ],function(
    Map,
    TileLayer,
    SceneView
    )
   {
    // Create two TileLayer instances.
    var transportationLayer = new TileLayer({
            url: "https://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Transportation/MapServer",
            id: "streets", // This property can be used to uniquely identify the layer
            visible: false //一开始是false
          });
          var housingLayer = new TileLayer({
            url: "https://tiles.arcgis.com/tiles/nGt4QxSblgDfeJn9/arcgis/rest/services/New_York_Housing_Density/MapServer",
            id: "house",
            opacity: 0.9
          });

          // Layers may be added to the map in the map's constructor
    var map = new Map({
     basemap:"oceans",
     layers:[housingLayer]
    })
     // Or they may be added to the map using map.add()
    map.add(transportationLayer);
          var view = new SceneView({
            container: "viewDiv",
            map: map
          });

          view.on("layerview-create", function(event) {
            if (event.layer.id === "house") {
              // Explore the properties of the population layer's layer view here
              console.log("LayerView for male population created!", event.layerView);
            }
            if (event.layer.id === "streets") {
              // Explore the properties of the transportation layer's layer view here
              // Explore the properties of the transportation layer's layer view here
              console.log("LayerView for streets created!", event.layerView);
            }
          });

          //跳转到人口的那个图层所在地
          view.when(function(){
          housingLayer.when(function(){
            view.goTo(housingLayer.fullExtent)
          })
          })
          //为复选框添加监听事件
          var streetToggle = document.getElementById("streetsLayer");
          streetToggle.addEventListener("change",function(){
          transportationLayer.visible = streetToggle.checked;
          })
  })
</script>
</head>
<body>
<div id="viewDiv"></div>
<span id="layerToggle">
  <input type="checkbox" id="streetsLayer">Transportation
</span>
</body>
</html>

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