中文教程

在对树节点进行操作后往往需要进行reload操作刷新一下树，但是很多业务都需要在树形刷新后默认选中最后一次选中的节点。这样就必须先保存前一次选中节点的信息，在reload之后再次通过节点的信息进行expand逐层展开到这个节点上。

查询了好久终于找到一个可行的方案，就是通过节点的path来记录节点的位置信息，然后通过path从root节点开始逐层展开，直到最后一个节点。

完成的代码如下：

首先是extjs3.x版本中的方法：

概述

在先前的文章已经介绍了许多这样的技术。这有助于去了解与比较他们之间的异同，以便于选择适合的工具来完成手头的工作。

Jay Garcia develops Ext JS and Sencha Touch applications for various clients around the world and actively contributes to the Sencha community as a speaker, advocate, and frequent poster on technical forums. Author of Ext JS in Action, Jay has been a Sencha enthusiast and supporter since 2006. Anthony De Moss has been an avid Ext JS enthusiast since 2007 and is fanatical about good product design and usability. On the rare occasion he's away from his keyboard, you can find him climbing at the local rock gym. Mitchell Simoens has been working with Ext JS since late 2006 and Sencha Touch since 2010. He now works at Sencha doing primarily support on the forums but also works on Ext JS and Sencha Touch.