递归查找数组中的元素

你应该更换

  getSubMenuItem(subMenuItems[i].items, id);

与

  var found = getSubMenuItem(subMenuItems[i].items, id);  if (found) return found;

为了在找到元素时返回它。

并注意属性名称，javascript区分大小写，因此您还必须替换

  if (subMenuItems[i].Id == id) {

与

  if (subMenuItems[i].id == id) {

示范

最终（清除）代码：

var getSubMenuItem = function (subMenuItems, id) {    if (subMenuItems) {        for (var i = 0; i < subMenuItems.length; i++) { if (subMenuItems[i].id == id) {     return subMenuItems[i]; } var found = getSubMenuItem(subMenuItems[i].items, id); if (found) return found;        }    }};