Merge pull request #495 from visuddhinanda/master

:bug: 目录再次保存没有清空旧数据

app/article/my_collect.js

@@ -282,9 +282,10 @@ function removeTocNode(){
 	}
 	
   }
-var arrTocTree = new Array();
+var arrTocTree;
 var iTocTreeCurrLevel = 1;
 function getTocTreeData(){
+	arrTocTree = new Array();
 	let tree = $("#ul_article_list").fancytree("getTree");
     let d = tree.toDict(false);
 	for (const iterator of d) {