根据JSON数据，生成TREE

function generateTree(node) {

if (!node.children) {

return new Ext.tree.TreeNode({

id: node.id,

text: node.text,

type: node.type || node.attributes.type,

leaf: true

});

}

var nodeObj = new Ext.tree.TreeNode({

id: node.id,

text: node.text,

type: node.type || node.attributes.type,

leaf: false

});

var childrenObj = node.children;

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

var child = childrenObj[i];

var nodeObj_2 = new Ext.tree.TreeNode({

id: child.id,

text: child.text,

type: child.type || child.attributes.type,

leaf: true

});

if (child.children) {

nodeObj_2.children = child.children;

}

nodeObj.appendChild(generateTree(nodeObj_2));

}

return nodeObj;

}