匿名Custom CheckBox Tree
Tree nodes with customized check boxes.
示例：
代码：
<div class="easyui-panel" style="padding:5px">
<ul class="easyui-tree" data-options="
url:'examples/tree/tree_data1.json',
method:'get',
animate:true,
checkbox:function(node){
if (node.id == 11 || node.id == 122){
return true;
}
}
"></ul>
</div>