asp.net TreeView点击父级触发子节点checkbox状态变更

function OnTreeNodeChecked() 
        {
            var ele = window.event.srcElement; 
            if(ele.type=='checkbox') 
            { 
                var childrenDivID = ele.id.replace('CheckBox','Nodes'); 
                var div = document.getElementById(childrenDivID); 
                if(div==null)return; 
                var checkBoxs = div.getElementsByTagName('INPUT'); 
                for(var i=0;i