add protocol params for imagery layer

modules/imagery/provider/AmapImageryProvider.js

 import ImageryType from '../ImageryType'
 import AmapMercatorTilingScheme from '../tiling-scheme/AmapMercatorTilingScheme'
 
-const IMG_URL =
-  'https://webst{s}.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}'
-
-const ELEC_URL =
-  'http://webrd{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}'
-
-const CVA_URL =
-  'https://webst{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}'
+const TILE_URL = {
+  img: '//webst{s}.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}',
+  elec:
+    '//webrd{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}',
+  cva:
+    '//webst{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}'
+}
 
 class AmapImageryProvider extends Cesium.UrlTemplateImageryProvider {
   constructor(options = {}) {
     options['url'] =
-      options.style === 'img'
-        ? IMG_URL
-        : options.style === 'cva'
-        ? CVA_URL
-        : ELEC_URL
+      options.url ||
+      [
+        options.protocol || '',
+        options.protocol ? ':' : '',
+        TILE_URL[options.style || 'elec']
+      ].join('')
     options['subdomains'] = options.subdomains || ['01', '02', '03', '04']
     if (options.crs === 'WGS84') {
       options['tilingScheme'] = new AmapMercatorTilingScheme()

modules/imagery/provider/BaiduImageryProvider.js

 import ImageryType from '../ImageryType'
 import BaiduMercatorTilingScheme from '../tiling-scheme/BaiduMercatorTilingScheme'
 
-const IMG_URL =
-  'http://shangetu{s}.map.bdimg.com/it/u=x={x};y={y};z={z};v=009;type=sate&fm=46'
-
-const VEC_URL =
-  'http://online{s}.map.bdimg.com/tile/?qt=tile&x={x}&y={y}&z={z}&styles=sl&v=020'
-
-const CUSTOM_URL =
-  'http://api{s}.map.bdimg.com/customimage/tile?&x={x}&y={y}&z={z}&scale=1&customid={style}'
-
-const TRAFFIC_URL =
-  'http://its.map.baidu.com:8002/traffic/TrafficTileService?time={time}&label={labelStyle}&v=016&level={z}&x={x}&y={y}&scaler=2'
+const TILE_URL = {
+  img:
+    '//shangetu{s}.map.bdimg.com/it/u=x={x};y={y};z={z};v=009;type=sate&fm=46',
+  vec:
+    '//online{s}.map.bdimg.com/tile/?qt=tile&x={x}&y={y}&z={z}&styles=sl&v=020',
+  custom:
+    '//api{s}.map.bdimg.com/customimage/tile?&x={x}&y={y}&z={z}&scale=1&customid={style}',
+  traffic:
+    '//its.map.baidu.com:8002/traffic/TrafficTileService?time={time}&label={labelStyle}&v=016&level={z}&x={x}&y={y}&scaler=2'
+}
 
 class BaiduImageryProvider {
   constructor(options = {}) {
     this._url =
-      options.style === 'img'
-        ? IMG_URL
-        : options.style === 'vec'
-        ? VEC_URL
-        : options.style === 'traffic'
-        ? TRAFFIC_URL
-        : CUSTOM_URL
+      options.url ||
+      [
+        options.protocol || '',
+        options.protocol ? ':' : '',
+        TILE_URL[options.style || 'custom']
+      ].join('')
     this._labelStyle = options.labelStyle || 'web2D'
     this._tileWidth = 256
     this._tileHeight = 256

modules/imagery/provider/GoogleImageryProvider.js

 import { Cesium } from '@dc-modules/namespace'
 import ImageryType from '../ImageryType'
 
-const ELEC_URL =
-  'http://mt{s}.google.cn/vt/lyrs=m@207000000&hl=zh-CN&gl=CN&src=app&x={x}&y={y}&z={z}&s=Galile'
-
-const IMG_URL =
-  'http://mt{s}.google.cn/vt/lyrs=s&hl=zh-CN&x={x}&y={y}&z={z}&s=Gali'
-
-const TER_URL =
-  'http://mt{s}.google.cn/vt/lyrs=t@131,r@227000000&hl=zh-CN&gl=cn&x={x}&y={y}&z={z}&s=Galile'
+const TILE_URL = {
+  img: '//mt{s}.google.cn/vt/lyrs=s&hl=zh-CN&x={x}&y={y}&z={z}&s=Gali',
+  elec:
+    '//mt{s}.google.cn/vt/lyrs=m@207000000&hl=zh-CN&gl=CN&src=app&x={x}&y={y}&z={z}&s=Galile',
+  ter:
+    '//mt{s}.google.cn/vt/lyrs=t@131,r@227000000&hl=zh-CN&gl=cn&x={x}&y={y}&z={z}&s=Galile'
+}
 
 class GoogleImageryProvider extends Cesium.UrlTemplateImageryProvider {
   constructor(options = {}) {
     options['url'] =
-      options.style === 'img'
-        ? IMG_URL
-        : options.style === 'ter'
-        ? TER_URL
-        : ELEC_URL
+      options.url ||
+      [
+        options.protocol || '',
+        options.protocol ? ':' : '',
+        TILE_URL[options.style || 'elec']
+      ].join('')
     options['subdomains'] = options.subdomains || ['1', '2', '3']
     super(options)
   }

modules/imagery/provider/TdtImageryProvider.js

 import ImageryType from '../ImageryType'
 
 const MAP_URL =
-  'https://t{s}.tianditu.gov.cn/DataServer?T={style}_w&x={x}&y={y}&l={z}&tk={key}'
+  '//t{s}.tianditu.gov.cn/DataServer?T={style}_w&x={x}&y={y}&l={z}&tk={key}'
 
 class TdtImageryProvider extends Cesium.UrlTemplateImageryProvider {
   constructor(options = {}) {
     super({
-      url: MAP_URL.replace(/\{style\}/g, options.style || 'vec').replace(
-        /\{key\}/g,
-        options.key || ''
-      ),
+      url: [
+        options.protocol || '',
+        options.protocol ? ':' : '',
+        MAP_URL.replace(/\{style\}/g, options.style || 'vec').replace(
+          /\{key\}/g,
+          options.key || ''
+        )
+      ].join(''),
       subdomains: ['0', '1', '2', '3', '4', '5', '6', '7'],
       tilingScheme: new Cesium.WebMercatorTilingScheme(),
       maximumLevel: 18

modules/imagery/provider/TencentImageryProvider.js

 import { Cesium } from '@dc-modules/namespace'
 import ImageryType from '../ImageryType'
 
-const IMG_URL =
-  'https://p{s}.map.gtimg.com/sateTiles/{z}/{sx}/{sy}/{x}_{reverseY}.jpg?version=400'
-
-const ELEC_URL =
-  'https://rt{s}.map.gtimg.com/tile?z={z}&x={x}&y={reverseY}&styleid={style}&scene=0&version=347'
+const TILE_URL = {
+  img:
+    '//p{s}.map.gtimg.com/sateTiles/{z}/{sx}/{sy}/{x}_{reverseY}.jpg?version=400',
+  elec:
+    '//rt{s}.map.gtimg.com/tile?z={z}&x={x}&y={reverseY}&styleid={style}&scene=0&version=347'
+}
 
 class TencentImageryProvider extends Cesium.UrlTemplateImageryProvider {
   constructor(options = {}) {
-    let url = options.style === 'img' ? IMG_URL : ELEC_URL
+    let url =
+      options.url ||
+      [
+        options.protocol || '',
+        options.protocol ? ':' : '',
+        TILE_URL[options.style || 'elec']
+      ].join('')
     options['url'] = url.replace('{style}', options.style || 1)
     options['subdomains'] = options.subdomains || ['1', '2', '3']
     if (options.style === 'img') {