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在swift下表示
let timeStamp = lroundf(5.999)
let s = timeStamp % 60
let m = (timeStamp - s) / 60 % 60
let h = ((timeStamp - s) / 60 - m) / 60 % 24;
let time = String(format: "%.2d:%.2d:%.2d", h, m, s)