ztree实现复选框功能，并且子节点选中时，父节点自动选中，子节点取消选中（若所有子节点都没有选中）则父节点也会自动取消选中，check配置如下：
check: {enable: true,chkStyle: "checkbox",chkboxType: {"Y": "p", "N": "p" },autoCheckTrigger: true},
但是，该check配置有个问题，子节点每次选中时，都会触发父节点的onCheck事件，假设每次选中的时候都会往后台发送请求，则父节点onCheck会发送很多无用的请求，如下图所示：
显然，点击“应用管理”子菜单时，“权限管理”父菜单会触发onCheck事件，并向后台发送请求是合理的（设置角色、菜单关联关系）。但是，当点击角色管理时，父菜单再次触发onCheck事件，并向后台发送请求就不合理啦，因为父菜单与角色已经设置了关联关系，那么该如何解决呢？
2个方案：
1）修改兵器，改造ztree组件，子节点选中时（如果父节点已经选中），父节点不再触发onCheck事件；
2）修改onCheck事件的逻辑处理，增加节点是否已选中判断，如果是则不再向后台发送请求
因为是第三方组件，修改组件有技术风险，并影响后续版本升级，既然修改兵器可可行，就只能修改onCheck事件，减少请求发送次数。本案onCheck如下：
var is_add = treeNode.checked == true ? 'Y' : 'N';if(treeNode.is_add == is_add) return;request({m:"setRoleMenu", is_add: is_add, role_id: role_id, mnu_id: treeNode.mnu_id},function (data, textStatus){if (data.flag) {console.log(treeNode);treeNode.is_add = is_add;var zTree = $.fn.zTree.getZTreeObj("tree-menus");zTree.updateNode(treeNode);}});
父节点第一次选中时，treeNode.is_add会设置为Y；后续子节点选中时，父节点仍然会触发onCheck事件，在onCheck事件中判断treeNode.is_add == ‘Y’，若条件成立则不再发送请求到后台，具体代码如下：
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