<p class="controls">
<input type="button" value="Play" id="video-btn">
<span id="curtime">0</span>/<span id="duration">0</span>
</p>
</p>
<script>
window.onload = function(){
//get references to the elements
var player = document.getElementById("player");
var btn = document.getElementById("video-btn");
var curtime = document.getElementById("curtime");
var duration = document.getElementById("duration");
***duration.innerHTML = player.duration;***请教大神，为什么这里要设置duration.innerHTML = player.duration，不设置不是一样可以用吗?
