改变视频宽高比例

 1 <h1>默认比例（640*360,16:9）</h1>
 2 <video id="video1" src="../xinwsWebsite/video/seawavws.mp4" controls autoplay loop style="width: 300px;border: 1px solid red;"></video>
 3 
 4 <h1>宽高比增大，高度变小（640*280,16:7）</h1>
 5 <script type="text/javascript">
 6     var rotate2 = (Math.acos(280/360)*180/Math.PI).toFixed(2); // 新高度 / 旧高度
 7 </script>
 8 <video id="video2" src="../xinwsWebsite/video/seawavws.mp4" controls autoplay loop style="width: 300px;border: 1px solid red;"></video>
 9 
10 <h1>宽高比减小，高度增加（480*360,4:3）</h1>
11 <script type="text/javascript">
12     var rotate3 = (Math.acos(480/640)*180/Math.PI).toFixed(2); // 新宽度 / 旧宽度
13 </script>
14 <video id="video3" src="../xinwsWebsite/video/seawavws.mp4" controls autoplay loop style="width: 300px;border: 1px solid red;"></video>
15 
16 <script type="text/javascript">
17     document.getElementById(‘video2‘).style.transform = ‘rotateX(‘+rotate2+‘deg)‘;
18     document.getElementById(‘video3‘).style.transform = ‘rotateY(‘+rotate3+‘deg)‘;
19 </script>