arcgis javascript api4.x以basetilelayer方式加载天地图web墨卡托（wkid：3857）坐标系

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需求：

arcgis javascript api4.x以basetilelayer方式加载天地图web墨卡托（wkid：3857）坐标系

效果图：

代码：

提示：

2个文件放同一个文件夹下

MyCustomTileLayer.js

define(['exports', "esri/layers/BaseTileLayer","esri/request"], function (exports,BaseTileLayer,esriRequest) {const MyCustomTileLayer = BaseTileLayer.createSubclass({// properties of the custom tile layerproperties: {urlTemplate: null,},// override getTileUrl()// generate the tile url for a given level, row and columngetTileUrl: function (level, row, col) {return this.urlTemplate.replace("{level}", level).replace("{col}", col).replace("{row}", row);},// This method fetches tiles for the specified level and size.// Override this method to process the data returned from the server.fetchTile: function (level, row, col, options) {// call getTileUrl() method to construct the URL to tiles// for a given level, row and col provided by the LayerViewvar url = this.getTileUrl(level, row, col);// request for tiles based on the generated url// the signal option ensures that obsolete requests are abortedreturn esriRequest(url, {responseType: "image",//signal: options && options.signalallowImageDataAccess: true }).then(function (response) {// when esri request resolves successfully// get the image from the responsevar image = response.data;var width = this.tileInfo.size[0];var height = this.tileInfo.size[0];// create a canvas with 2D rendering contextvar canvas = document.createElement("canvas");var context = canvas.getContext("2d");canvas.width = width;canvas.height = height;// Apply the tint color provided by// by the application to the canvasif (this.tint) {// Get a CSS color string in rgba form// representing the tint Color instance.context.fillStyle = this.tint.toCss();context.fillRect(0, 0, width, height);// Applies "difference" blending operation between canvas// and steman tiles. Difference blending operation subtracts// the bottom layer (canvas) from the top layer (tiles) or the// other way round to always get a positive value.context.globalCompositeOperation = "difference";}// Draw the blended image onto the canvas.context.drawImage(image, 0, 0, width, height);return canvas;}.bind(this));}});return MyCustomTileLayer;})

loadtdt3857.html

<html><head><meta charset="utf-8" /><meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" /><title>（墨卡托）天地图加载</title><style>html,body,#viewDiv {width: 100%;height: 100%;padding: 0;margin: 0;}</style><link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/css/main.css" /><script src="https://js.arcgis.com/4.23/init.js"></script><script>require(["esri/Map","esri/views/MapView","esri/layers/GraphicsLayer","esri/Graphic","esri/PopupTemplate","esri/widgets/Popup","esri/layers/MapImageLayer","esri/widgets/Legend","esri/layers/WebTileLayer","esri/layers/WMTSLayer","esri/widgets/BasemapGallery/support/LocalBasemapsSource","esri/widgets/BasemapGallery","esri/Basemap","esri/layers/FeatureLayer","esri/geometry/Extent","esri/geometry/SpatialReference",'esri/config','esri/layers/support/TileInfo',"./MyCustomTileLayer.js","esri/layers/TileLayer",], function(Map,MapView,GraphicsLayer,Graphic,PopupTemplate,Popup,MapImageLayer,Legend,WebTileLayer,WMTSLayer,LocalBasemapsSource,BasemapGallery,Basemap,FeatureLayer,Extent,SpatialReference,esriConfig,TileInfo,MyCustomTileLayer,TileLayer) {var key = "天地图key"key = "6a92e00bdfafade25568c053a5ba6de4"// http://t0.tianditu.com/img_w/esri/wmts  可代替  http://t0.tianditu.gov.cn/img_w/wmts  效果一致var tiledLayer = new MyCustomTileLayer({urlTemplate: "http://t0.tianditu.gov.cn/img_w/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=img&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles&TileMatrix={level}&TileCol={col}&TileRow={row}&tk=" +key,id: '影像',listMode: 'hide' //这个属性设置是为了在layerlist不显示出来});var tiledLayer_poi = new MyCustomTileLayer({urlTemplate: "http://t0.tianditu.gov.cn/cia_w/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=cia&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles&TileMatrix={level}&TileCol={col}&TileRow={row}&tk=" +key,id: '影像标记',listMode: 'hide'});var tiledLayer1 = new MyCustomTileLayer({urlTemplate: "http://t0.tianditu.gov.cn/vec_w/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=vec&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles&TileMatrix={level}&TileCol={col}&TileRow={row}&tk=" +key,id: '矢量',visible: false,listMode: 'hide'});var tiledLayer_poi1 = new MyCustomTileLayer({urlTemplate: "http://t0.tianditu.gov.cn/cva_w/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=cva&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles&TileMatrix={level}&TileCol={col}&TileRow={row}&tk=" +key,id: '矢量标记',visible: false,listMode: 'hide'});var basemap = new Basemap({baseLayers: [tiledLayer, tiledLayer_poi, tiledLayer1, tiledLayer_poi1],})var map = new Map({basemap: basemap});var view = new MapView({container: "viewDiv",map: map,spatialReference: {wkid: 3857  //102100},center: [114.3115879,30.5943680], //113.27434372047993,22.722786885699826linked: false,zoom:7,});});</script></head><body class="calcite"><div id="viewDiv"></div></body>
</html>