Rivers know this: there is no hurry. We shall get there some day.
河流知道這一點(diǎn)：無需匆忙。我們終有一日會到達(dá)。———— A. A. Milne
計(jì)算當(dāng)前在線人數(shù)例子一:用文本實(shí)現(xiàn)