据美国媒体报道，美军计划在今年夏季组建首支水面无人舰队，其装备包括无人水面航行器和水面无人机平台等。
Im looking for a way, in javascript, to calculate the size of the browser (px) then calculate the size of a <div> taking away 50px from that full screen size:
加载中,请稍侯......