调整下载方式

public/react/src/modules/courses/statistics/Statistics.js

@@ -160,7 +160,18 @@ class Statistics extends Component{
 
 	derivefun=(url)=>{
 		let{group_ids}=this.state;
-		this.props.slowDownload(`${url}?group_id=${group_ids}`);
+		let list=group_ids;
+    let urllist="";
+	 if(list!=undefined&&list.length!=0)
+			list.map((item,key)=>{
+				if(key===0){
+					urllist=`group_id[]=${item}`
+				}else{
+					urllist=urllist+`&group_id[]=${item}`
+				}
+
+			})
+		this.props.slowDownload(`${url}?${urllist}`);
 	}