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先说leaflet,
leaflet 默认使用的坐标系是 EPSG:3857，百度地图：使用百度坐标系
高德地图：火星坐标系（GcJ02）
leaflet是默认支持GcJ02的，而且leaflet提供了这个插件L.tileLayer.chinaProvider ，可以引入高德、谷歌、天地图，不用经过转化。但是百度坐标就需要进行额外的转化:代码如下（本人只是个代码搬运工~~） /** * 百度地图底图调用插件 * @author 火星科技 木遥原创(qq:346819890) *///请引入 proj4.js 和 proj4leaflet.jsL.CRS.Baidu = new L.Proj.CRS( "EPSG:900913", "+proj=merc +a=6378206 +b=6356584.314245179 +lat_ts=0.0 +lon_0=0.0 +x_0=0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs", { resolutions: (function() { level = 19; var res = []; res[0] = Math.pow(2, 18); for (var i = 1; i < level; i++) { res[i] = Math.pow(2, 18 - i); } return res; })(), origin: [0, 0], bounds: L.bounds([20037508.342789244, 0], [0, 20037508.342789244]) });L.tileLayer.baidu = function(option) { option = option || {}; var layer; var subdomains = "0123456789"; switch (option.layer) { //单图层 case "vec": default: //'http://online{s}.map.bdimg.com/tile/?qt=tile&x={x}&y={y}&z={z}&styles=pl&b=0&limit=60&scaler=1&udt=20170525' layer = L.tileLayer( "http://online{s}.map.bdimg.com/onlinelabel/?qt=tile&x={x}&y={y}&z={z}&styles=" + (option.bigfont ? "ph" : "pl") + "&scaler=1&p=1", { name: option.name, subdomains: subdomains, tms: true } ); break; case "img_d": layer = L.tileLayer( "http://shangetu{s}.map.bdimg.com/it/u=x={x};y={y};z={z};v=009;type=sate&fm=46", { name: option.name, subdomains: subdomains, tms: true } ); break; case "img_z": layer = L.tileLayer( "http://online{s}.map.bdimg.com/tile/?qt=tile&x={x}&y={y}&z={z}&styles=" + (option.bigfont ? "sh" : "sl") + "&v=020", { name: option.name, subdomains: subdomains, tms: true } ); break; case "custom": //Custom 各种自定义样式 //可选值：dark,midnight,grayscale,hardedge,light,redalert,googlelite,grassgreen,pink,darkgreen,bluish option.customid = option.customid || "midnight"; layer = L.tileLayer( "http://api{s}.map.bdimg.com/customimage/tile?&x={x}&y={y}&z={z}&scale=1&customid=" + option.customid, { name: option.name, subdomains: "012", tms: true } ); break; case "time": //实时路况 var time = new Date().getTime(); layer = L.tileLayer( "http://its.map.baidu.com:8002/traffic/TrafficTileService?x={x}&y={y}&level={z}&time=" + time + "&label=web2D&v=017", { name: option.name, subdomains: subdomains, tms: true } ); break; //合并 case "img": layer = L.layerGroup([ L.tileLayer.baidu({ name: "底图", layer: "img_d", bigfont: option.bigfont }), L.tileLayer.baidu({ name: "注记", layer: "img_z", bigfont: option.bigfont }) ]); break; } return layer;};html中使用 <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" /> <title>地图</title> <style> html, body, #map { padding: 0; margin: 0; height: 100%; width: 100%; } </style> <link rel="stylesheet" href="https:///leaflet@1.6.0/dist/leaflet.css" /> <script src="https:///leaflet@1.6.0/dist/leaflet.js"></script><!-- 加载百度地图使用插件 --> <script src="https://cdn./proj4js/2.4.3/proj4.js"></script> <script src="https://cdn./proj4leaflet/1.0.1/proj4leaflet.min.js"></script> <script src="./tileLayer.baidu.js"></script></head><body> <div id="map" class="map"> </div> <script type="text/javascript"> //注意将map的crs赋值 crs: L.CRS.Baidu 详情请阅读示例页面 var map = L.map('map', { crs: L.CRS.Baidu, minZoom: 3, maxZoom: 18, attributionControl: false, center: [31.834912, 117.220102], zoom: 12 });//控制地图底图 L.control.layers({ "百度地图": L.tileLayer.baidu({ layer: 'vec' }).addTo(map), "百度卫星": L.tileLayer.baidu({ layer: 'img' }), "百度地图-大字体": L.tileLayer.baidu({ layer: 'vec', bigfont: true }), "百度卫星-大字体": L.tileLayer.baidu({ layer: 'img', bigfont: true }), "自定义样式-黑色地图": L.tileLayer.baidu({ layer: 'custom', customid: 'dark' }), "自定义样式-蓝色地图": L.tileLayer.baidu({ layer: 'custom', customid: 'midnight' }) //自定义样式地图，customid可选值：dark,midnight,grayscale,hardedge,light,redalert,googlelite,grassgreen,pink,darkgreen,bluish }, { "实时交通信息": L.tileLayer.baidu({ layer: 'time' }) }, { position: "topright" }).addTo(map); </script></body>这样就实现了百度地图的加载 高德加载如下：var Gaode = L.tileLayer.chinaProvider('GaoDe.Normal.Map', { maxZoom: 18, minZoom: 5 }); var map = L.map("map", { crs: L.CRS.EPSG3857,//这里坐标系一定要改成3857的！！！ center: [31.59, 120.29], zoom: 12, layers: [Gaode], zoomControl: false });总结一下：我本来是想在一个地图里面通过切换图层的方式切换高德和百度，但是由于坐标系的原因，我想到的方法是在进行图层切换的时候修改一下地图的坐标系，但是我翻阅了leaflet的文档没有找到动态修改CRS的方法，如果有哪位大神看到了这个帖子，如果可以实现同时切换高德和百度，请告知方法，感谢感谢。
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