extjs4.0 树 复选框
extjs4.0 树复选框，如图http://blog.csdn.net/weil001/article/details/4008016 网址的维度成员选择效果过，后台的数据json不能有checked：true或false
------解决方案--------------------

Ext.require(['*']);

Ext.onReady(function(){  

	var data = [

	{

		"text": "To Do", 

		"cls": "folder",

		"expanded": true,

		"children": [{

			"text": "Go jogging",

			"leaf": true

		},{

			"text": "Take a nap",

			"leaf": true

		},{

			"text": "Climb Everest",

			"leaf": false,

			"children":[{"text":"Go Shopping","leaf":true}]

		}]

	},{

		"text":"Go Hiking",

		"cls":"folder",

		"leaf":true

		}]

    var store2 = Ext.create('Ext.data.TreeStore', {

        root: {

            text: 'Custom Ext JS',

            id: 'src',

            expanded: true,

            children: data

        },

        folderSort: true,

        sorters: [{

            property: 'text',

            direction: 'ASC'

        }]

    });

	function iterNodes(rootnodes){

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

				rootnodes[i].data.checked=false            //设置checkebox

					if(rootnodes[i].childNodes.length>0){

						iterNodes(rootnodes[i].childNodes) //如果有子节点就递归。

				}

			}

	}

    var tree2 = Ext.create('Ext.tree.Panel', {

        id: 'tree2',

        width: 250,

        height: 300,

        store: store2,

        viewConfig: {

            plugins: {

                ptype: 'treeviewdragdrop',

                appendOnly: true

            }

        },

        renderTo: document.body,

		listeners:{

			render:function(t){

				var tree = t.store;

				var rootnodes = tree.getRootNode().childNodes;//获取主节点

					iterNodes(rootnodes);

			}

		}

    });

});