Javascript 秒數轉時分秒

最近常在網頁上用到
尤其是撥html5 video

   function formatSecond(secs) {          
            var hr = Math.floor(secs / 3600);
            var min = Math.floor((secs - (hr * 3600)) / 60);
            var sec = parseInt( secs - (hr * 3600) - (min * 60));

            while (min.length < 2) { min = '0' + min; }
            while (sec.length < 2) { sec = '0' + sec; }
            if (hr) hr += ':';
            return hr + min + ':' + sec;

        }

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