代码大部分参考网络资源，但针对网络资源中取消选中的各种问题做了改进。

if ($.fn.treegrid) {    $.extend($.fn.treegrid.methods, {        /**          * 级联选择          * @param {Object} target          * @param {Object} param           *      param包括两个参数:          *          id:勾选的节点ID          *          deepCascade:是否深度级联          * @return {TypeName}           */        cascadeCheck: function (target, param) {            var opts = $.data(target[0], "treegrid").options;            if (opts.singleSelect)                return;            var idField = opts.idField;//这里的idField其实就是API里方法的id参数              var status = false;//用来标记当前节点的状态，true:勾选，false:未勾选              var selectNodes = $(target).treegrid(‘getSelections‘);//获取当前选中项              for (var i = 0; i < selectNodes.length; i++) {                if (selectNodes[i][idField] == param.id)                    status = true;            }            selectChildren(target[0], param.id, idField, param.deepCascade, status);            //级联选择父节点            selectParent(target[0], param.id, idField, status);            /**              * 级联选择父节点              * @param {Object} target              * @param {Object} id 节点ID              * @param {Object} status 节点状态，true:勾选，false:未勾选              * @return {TypeName}               */            function selectParent(target, id, idField, status) {                var parent = $(target).treegrid(‘getParent‘, id);                if (parent) {                    var parentId = parent[idField];                    if (status) {                        $(target).treegrid(‘select‘, parentId);                    } else {                        var hasChildSelected = false;                        var selected_hash = {};                        var selectNodes = $(target).treegrid(‘getSelections‘);//获取当前选中项                          for (var i = 0; i < selectNodes.length; i++) {                            selected_hash[selectNodes[i][idField]] = true;                        }                        var children = $(target).treegrid(‘getChildren‘, parentId);                        for (var i = 0; i < children.length; i++) {                            var childID = children[i][idField];                            if (selected_hash[childID]) hasChildSelected = true;                        }                        //同级没有被选中的项                        if (!hasChildSelected) $(target).treegrid(‘unselect‘, parentId);                    }                    selectParent(target, parentId, idField, status);                }            }            /**              * 级联选择子节点              * @param {Object} target              * @param {Object} id 节点ID              * @param {Object} deepCascade 是否深度级联              * @param {Object} status 节点状态，true:勾选，false:未勾选              * @return {TypeName}               */            function selectChildren(target, id, idField, deepCascade, status) {                //深度级联时先展开节点                  if (!status && deepCascade)                    $(target).treegrid(‘expand‘, id);                //根据ID获取下层孩子节点                  var children = $(target).treegrid(‘getChildren‘, id);                for (var i = 0; i < children.length; i++) {                    var childId = children[i][idField];                    if (status)                        $(target).treegrid(‘select‘, childId);                    else                        $(target).treegrid(‘unselect‘, childId);                    selectChildren(target, childId, idField, deepCascade, status);//递归选择子节点                  }            }        }    });}


针对treegrid添加了cascadeCheck方法，其参数是id, deepCascade(bool)。

easyui——treegrid级联选中之微改进，解决解除选中的问题。