下面介绍 Jquery easyui tree 一些常见操作：

　　遍历tree nodes

function Travel(treeID){//参数为树的ID，注意不要添加#
var roots=$('#'+treeID).tree('getRoots'),children,i,j;
for(i=0;i<roots.length;i++){
alert(roots[i].text);
children=$('#'+treeID).tree('getChildren',roots[i].target);
for(j=0;j<children.length;j++)alert(children[j].text);
}
}

$(function(){
$('#tt2').tree({
checkbox: true,
url: 'tree_data.json',
onClick: function(node){
$(this).tree('toggle', node.target);
//alert('you dbclick '+node.text);
},
onContextMenu: function(e, node){
e.preventDefault();
$('#tt2').tree('select', node.target);
$('#mm').menu('show', {
left: e.pageX,
top: e.pageY
});
}
});
});

function reload(){
var node = $('#tt2').tree('getSelected');
if (node) {
$('#tt2').tree('reload', node.target);
}
else {
$('#tt2').tree('reload');
}
}

function getChildren(){
var node = $('#tt2').tree('getSelected');
if (node) {
var children = $('#tt2').tree('getChildren', node.target);
}
else {
var children = $('#tt2').tree('getChildren');
}
var s = '';
for (var i = 0; i < children.length; i++) {
s += children[i].text + ',';
}
alert(s);
}

function getChecked(){
var nodes = $('#tt2').tree('getChecked');
var s = '';
for (var i = 0; i < nodes.length; i++) {
if (s != '')
s += ',';
s += nodes[i].text;
}
alert(s);
}

function getSelected(){
var node = $('#tt2').tree('getSelected');
alert(node.text);
}

function collapse(){
var node = $('#tt2').tree('getSelected');
$('#tt2').tree('collapse', node.target);
}

function expand(){
var node = $('#tt2').tree('getSelected');
$('#tt2').tree('expand', node.target);
}

function collapseAll(){
var node = $('#tt2').tree('getSelected');
if (node) {
$('#tt2').tree('collapseAll', node.target);
}
else {
$('#tt2').tree('collapseAll');
}
}

function expandAll(){
var node = $('#tt2').tree('getSelected');
if (node) {
$('#tt2').tree('expandAll', node.target);
}
else {
$('#tt2').tree('expandAll');
}
}

function append(){
var node = $('#tt2').tree('getSelected');
$('#tt2').tree('append', {
parent: (node ? node.target : null),
data: [{
text: 'new1',
checked: true
}, {
text: 'new2',
state: 'closed',
children: [{
text: 'subnew1'
}, {
text: 'subnew2'
}]
}]
});
}

function remove(){
var node = $('#tt2').tree('getSelected');
$('#tt2').tree('remove', node.target);
}

function update(){
var node = $('#tt2').tree('getSelected');
if (node) {
node.text = '<span style="font-weight:bold">new text<\/span>';
node.iconCls = 'icon-save';
$('#tt2').tree('update', node);
}
}

function isLeaf(){
var node = $('#tt2').tree('getSelected');
var b = $('#tt2').tree('isLeaf', node.target);
alert(b)
}

function GetNode(type){
var node = $('#tt2').tree('getChecked');
var chilenodes = '';
var parantsnodes = '';
var prevNode = '';
for (var i = 0; i < node.length; i++) {

if ($('#tt2').tree('isLeaf', node[i].target)) {
chilenodes += node[i].text + ',';

var pnode = $('#tt2').tree('getParent', node[i].target);
if (prevNode != pnode.text) {
parantsnodes += pnode.text + ',';
prevNode = pnode.text;
}
}
}
chilenodes = chilenodes.substring(0, chilenodes.length - 1);
parantsnodes = parantsnodes.substring(0, parantsnodes.length - 1);

if (type == 'child') {
return chilenodes;
}
else {
return parantsnodes
};
};
function getNodes(){
alert(GetNode('fnode') + "," + GetNode('child'));
}

function doNode(){
var c="";
var p="";
$(".tree-checkbox1").parent().children('.tree-title').each(function(){
c+=$(this).parent().attr('node-id')+",";
});
$(".tree-checkbox2").parent().children('.tree-title').each(function(){
p+=$(this).parent().attr('node-id')+",";
});
var str=(c+p);
str=str.substring(0,str.length-1);
alert(str);
}