給定一個URI，返回該URI的基路徑。
Parameters:
uri
(String)
URI。
includeQuery
(Boolean)
(default false)
是否包含來自URI的查詢字符串和片段
Example
// basePath will be "/Gallery/";
var basePath = bmgl.getBaseUri('/Gallery/simple.czml?value=true&example=false');
// basePath will be "/Gallery/?value=true&example=false";
var basePath = bmgl.getBaseUri('/Gallery/simple.czml?value=true&example=false', true);