| 摘要 |
In one embodiment, display a plurality of first information items, wherein: a hierarchy of information items comprises the plurality of first information items; each non-root information item in the hierarchy has a parent information item; and each non-leaf information item in the hierarchy has one or more child information items. Receive a first user interaction in connection with a first one of the plurality of first information items. In response to the first user interaction, if the first one of the plurality of first information items is a non-leaf information item in the hierarchy, then expand the first one of the plurality of first information items by displaying one or more second information items that are child information items of the first one of the plurality of first information items.
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