JS控制视频的播放

<video id="video_1">
    <source id="source_1" src="video.mp4"/>
</video>

//定义一个定时器
var time = null,
//定义一个变量，通过id找到video标签
video_change = null,
source_change = null;
window.onload = function (){
   time = setInterval("change()",5000); 
}
function change(){
     video_change = document.getElementById("video_1");
    source_change = document.getElementById("source_1");
    video_change.load();
    source_change.src = "video.mp4";
}