<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div style="text-align:center">
<button onclick="playPause()">播放/暂停</button>
<button onclick="makeBig()">放大</button>
<button onclick="makeSmall()">缩小</button>
<button onclick="makeNormal()">普通</button>
<br>
<video id="video1" width="420">
<source src="https://www.runoob.com/try/demo_source/mov_bbb.mp4" type="video/mp4">
<source src="https://www.runoob.com/try/demo_source/mov_bbb.ogg" type="video/ogg"> 您的浏览器不支持 HTML5 video 标签。
</video>
</div>
<script>
var myVideo = document.getElementById("video1");
function playPause() {
if(myVideo.paused)
myVideo.play();
else
myVideo.pause();
}
function makeBig() {
myVideo.width = 560;
}
function makeSmall() {
myVideo.width = 320;
}
function makeNormal() {
myVideo.width = 420;
}
</script>
</body>
</html>