sharepoint ECMA 添加指定的人员和指定的角色到某个list里

有的时候我们需要给某个list添加指定的人员和指定的角色：具体代码如下：

        function AddUserAndRoleToList() {
            var SubClientContent =new SP.ClientContext(siteUrl);
            var SubWeb = SubClientContent.get_web();
            var subList = SubWeb.get_lists().getByTitle(self.DocumentName());
            $("div[id$='DPUser_upLevelDiv'] div").each(function (i, value) {
                if (value.id != null) {
                    if (value.id == 'divEntityData' && value.parentElement.title != null) {
                        var ouser = value.parentElement.title;
                        //break role inheritance
                        subList.breakRoleInheritance(false, true);
                        var currentUser = SubWeb.ensureUser(ouser);
                        var roleDefinition = SP.RoleDefinitionBindingCollection.newObject(SubClientContent);
                        roleDefinition.add(SubWeb.get_roleDefinitions().getByType(SP.RoleType.contributor));
                        subList.get_roleAssignments().add(currentUser, roleDefinition);
                        SubClientContent.executeQueryAsync(
                                        Function.createDelegate(this, onQuerySucceeded),
                                        Function.createDelegate(this, onQueryFailed)
                            );
                    }
                }
            });

        }//add list success