[fix] 修改 mip-map 将 BMap 挂载到沙盒对象上的方法 (#598)

* 修改 mip-map 将 BMap 挂载到沙盒对象上的方法

* 将 map 常量挂载到BMap.CONSTANTS 上面去

* 尽量少改动原有逻辑

components/mip-map/mip-map.js

@@ -128,6 +128,14 @@ export default class MIPMap extends CustomElement {
       window.BMap = {}
       window.BMap._insertScript = new Promise(resolve => {
         window._initBaiduMap = () => {
+          // 把百度地图的参数挂到 BMap.CONSTANTS 上
+          window.BMap.CONSTANTS = Object.keys(window)
+            .filter(key => key.indexOf('BMAP_') === 0)
+            .reduce((obj, key) => {
+              obj[key] = window[key]
+              return obj
+            }, {})
+
           resolve(window.BMap)
           window.document.body.removeChild(script)
           window.BMap._insertScript = null
@@ -152,12 +160,7 @@ export default class MIPMap extends CustomElement {
     let BMap = window.BMap
 
     // BMap注入沙盒
-    Object.defineProperty(sandbox, 'BMap', {
-      value: BMap,
-      writable: false,
-      enumerable: true,
-      configurable: true
-    })
+    sandbox.BMap = BMap
 
     // 派发事件
     viewer.eventAction.execute('loaded', this.element, {})