Ext3.x TreePanel 单击树枝节点，铺展该节点

Ext3.x TreePanel 单击树枝节点，展开该节点

//在TreePanel上面添加click的监听器事件listeners : {click : function(n) {var attrs = n.attributes;if (attrs.leaf) {//如果是叶子//do something} else {//如果是树枝n.toggle();//展开树枝节点}}}

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