Abstract: An antenna structure includes a middle frame body. The middle frame body includes a main board and an embedded metal, the embedded metal includes a metal body part and a metal extension part, the metal main body part and the metal extension part are an integral structure, the main board includes a first main board and a second main board, the first main board is electrically connected to the metal extension part, the first main board is configured to introduce a radio frequency signal into the metal extension part, the second main board is electrically connected to the metal extension part, and the second main board is configured to ground the metal extension part.

Abstract: Embodiments of the present disclosure provide an offline caching method and apparatus. In this method, a resource downloading request may be intercepted. An identifier of a resource may be obtained from the resource downloading request. It may be determined whether the resource corresponding to the identifier is saved in a local database. The resource corresponding to the identifier may be encapsulated and a response may be made to the resource downloading request if the resource corresponding to the identifier is saved in the local database.