dojo tree的折叠和展开

function collapseAll(branches, myTree){

   if(branches == null){     

      if(myTree == null){

         myTree = dijit.byId('MenuTree');

      }

      

      branches = myTree.rootNode.getChildren();

   }

   var branch;

   for(var i = 0; i<branches.length; i+=1){

      branch = branches[i];       

      collapseAll(branch.getChildren(), myTree);

      myTree._collapseNode(branch);

   }

}

function expandAll(branches,myTree){

if(branches == null){     

   if(myTree == null){

      myTree = dijit.byId('MenuTree');

   }

   

   branches = myTree.rootNode.getChildren();

}

var branch;

for(var i = 0; i<branches.length; i+=1){

   branch = branches[i];       

   expandAll(branch.getChildren(), myTree);

   myTree._expandNode(branch);

}

}