javascript 满足多层treeview的各种勾选

这段时间在微软团队里给上海贝尔做EHR项目，总的来说上海贝尔的食堂还会不错的，可能是目前为止吃过最好吃的食堂了吧。
这个项目有一点我有点不喜欢，他们在项目里用到了第三方的Telerik，我觉得比较慢，于是基本还是自己写。下面这个就是treeview的各种勾选要求，本银完全用js完成。
        var childIds = "";
        function GetChildIdArray2(parentNode) {
            if (parentNode == null) {
                return;
            }
            var childNodes = parentNode.children;
            var count = childNodes.length;
            for (var i = 0; i < count; i++) {
                var tmpNode = childNodes[i];
                if (tmpNode.tagName == "INPUT" && tmpNode.type == "checkbox") {
                    childIds = tmpNode.id + ":" + childIds;
                }
                GetChildIdArray2(tmpNode);
            }
        }
        function SetChildCheckBox(parentNode, checked) {
            if (parentNode == null) {
                return;
            }
            var childNodes = parentNode.children;
            var count = childNodes.length;
            for (var i = 0; i < count; i++) {
                var tmpNode = childNodes[i];
                if (tmpNode.tagName == "INPUT" && tmpNode.type == "checkbox") {
                    tmpNode.checked = checked;
                }
                SetChildCheckBox(tmpNode, checked);
            }
        }
        function SetParentCheckBox(childNode,tag) {
            if (childNode == null) {
                return;
            }
            var parent = childNode.parentNode;
            if (parent == null || parent == "undefined") {
                return;
            }
            do {
                parent = parent.parentNode;
            }
            while (parent && parent.tagName != "DIV");
            if (parent == "undefined" || parent == null) {
                return;
            }
            var parentId = parent.getAttribute("ID");
            if (parentId == "") return;
            var objParent = document.getElementById(parentId);
            childIds = "";
            GetChildIdArray2(objParent);
            childIds = childIds.substring(0, childIds.length - 1);
            var aryChild = childIds.split(":");
            var result = false;
            for (var i in aryChild) {
                var childCk = document.getElementById(aryChild[i]);
                if (childCk.checked == true) {
                    result = true;
                    break;
                }
            }

            var result2 = true;
            for (var i in aryChild) {
                var childCk = document.getElementById(aryChild[i]);
                if (childCk.checked == false) {
                    result2 = false;
                    break;
                }
            }
            parentId = parentId.replace("Nodes", "CheckBox");
            var parentCk = document.getElementById(parentId);
            if (parentCk == null) {
                return;
            }
            if (tag == 0) {
                if (result) {
                    parentCk.checked = true;
                }
                else {
                    parentCk.checked = false;
                }
            }
            else if (tag == 1) {
                if (result2) {
                    parentCk.checked = true;
                }
                else {
                    parentCk.checked = false;
                }
            }
            else {
            }
            SetParentCheckBox(parentCk,tag);
        }
        //有子勾选父就勾选（递归）
        function OnCheckEvent() {
            var objNode = event.srcElement;
            if (objNode.tagName != "INPUT" || objNode.type != "checkbox") {
                return;
            }
            var ck_ID = objNode.getAttribute("ID");
            var node_ID = ck_ID.substring(0, ck_ID.indexOf("CheckBox")) + "Nodes";
            var curTreeNode = document.getElementById(node_ID);
            SetChildCheckBox(curTreeNode, objNode.checked);
            SetParentCheckBox(objNode,0);
        }
        //子全部勾选父才勾选（递归）
        function OnCheckEvent_P() {
            var objNode = event.srcElement;
            if (objNode.tagName != "INPUT" || objNode.type != "checkbox") {
                return;
            }
            var ck_ID = objNode.getAttribute("ID");
            var node_ID = ck_ID.substring(0, ck_ID.indexOf("CheckBox")) + "Nodes";
            var curTreeNode = document.getElementById(node_ID);
            SetChildCheckBox(curTreeNode, objNode.checked);
            SetParentCheckBox(objNode,1);
        }