如
var s=100
alert( "时间:"+Math.floor(s/60))+"分"+(s-Math.floor(s/60)*60)+"秒"
var hour = Math.floor (video1.duration / 3600)var other = video1.duration % 3600
var minute = Math.floor (other / 60)
var second = (other % 60).toFixed (2)
document.getElementById ('duration').innerHTML = hour + '时' + minute + '分' + second + '秒'