注意：video中source 源文件地址src替换成你的video路径
<html>
<button onclick="playPause();">播放/暂停</button>
<button onclick="bigSize();">大</button>
<button onclick="normalSize();">中</button>
<button onclick="smallSize();">小</button>
<video id="myVideo" width="400px";height="400px" autoplay="autoplay" controls="controls" loop="loop">
<source src="video/movie.mp4" type="video/mp4">
</video>
<script>
var myVideo=document.getElementById("myVideo");
function playPause(){
if(myVideo.paused){
myVideo.play();
}else{
myVideo.pause();
}
}
function bigSize(){
myVideo.width=560;
}
function normalSize(){
myVideo.width=420;
}
function smallSize(){
myVideo.width=360;
}
</script>
</html>