JavaScript奇淫技巧：20行代码，实现屏幕录像

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JavaScript奇淫技巧：20行代码，实现屏幕录像

最后更新时间：2023-02-02 07:48:12

jq 录像

# 第一步：
复制一段JS代码，这段代码是实现录像功能的：
![](https://llcwyx.com/uploads/article/2022-11-23/d3k2IxWbhwLUtdL0mcJ2ejiVfF4XKJw7jebyKgZf.webp)
```javascript
var body = document.body;
body.addEventListener("click",async function(){
var stream = await navigator.mediaDevices.getDisplayMedia({video: true});

var mime = MediaRecorder.isTypeSupported("video/webm; codecs=vp9") ?"video/webm; codecs=vp9" :"video/webm";
var mediaRecorder = new MediaRecorder(stream, {mimeType: mime});

//录制
var chunks = [];
mediaRecorder.addEventListener('dataavailable', function(e) {
chunks.push(e.data)
})

//停止
mediaRecorder.addEventListener('stop', function(){
var blob = new Blob(chunks, {type: chunks[0].type});
var url = URL.createObjectURL(blob);
var a = document.createElement('a');
a.href = url;
a.download = 'video.webm';
a.click();
})
//手动启动
mediaRecorder.start()
});
```
# 第二步：
打开任意网站，比如JShaman官网：
![](https://llcwyx.com/uploads/article/2022-11-23/l6XJHTRlawa2C3HQkVmNob1OrjhK2hKPbAcAmKuI.webp)
然后调出“Web开发者工具”，并切换到“控制台”。

# 第三步：
粘贴上面复制的JS代码，并按下回车。
![](https://llcwyx.com/uploads/article/2022-11-23/H9cIledJwXngiDeVAKuqfs45ps9Mbb12EBKDJuyH.webp)
回车后会显示出“undefined”：
![](https://llcwyx.com/uploads/article/2022-11-23/mkUFdjkS8fNpgXDViIK5QUTpAYnRjclvJhdmSbH8.png)
# 第四步：
在网页任意地方点击鼠标，即可进行录屏操作。
![](https://llcwyx.com/uploads/article/2022-11-23/awCLIYh5EhSsdSM5lLsh1iNAIypCMiA8yNFldjK1.webp)
这时会弹出一个窗口，供选择录制范围。
之后便开始录制了。

当需要停止录像时，点击”停止共享”就可以了。
![](https://llcwyx.com/uploads/article/2022-11-23/AbOK2S3HxdR3GAoewikoylAkk6t05svz6RJkhT8d.webp)
停止录制后，刚刚录制的内容会自动保存成一个视频文件：
![](https://llcwyx.com/uploads/article/2022-11-23/xfV8VJv3cmSq2Sxe73zqtYtPUoKT1luEknpcu91U.webp)
打开便可播放：
![](https://llcwyx.com/uploads/article/2022-11-23/2Ky4cdzTqQ6eOIoRTgKTxfCGBQj14vJkHm4m8taP.webp)
在这整个过程中，最重要的是第一步中的JS代码。

代码可自行阅读理解，大意是给document.body添加点击事件，当点击时，进行屏幕录像。

所以，只要保存那段代码，便可给任意网站添加录像功能。

如果想要修改触发条件，比如把鼠标点击改为鼠标双击，只需修改addEventListener中的事件名称即可。

例：改为双击：

```javascript
var body = document.body;
body.addEventListener("dblclick",async function(){
var stream = await navigator.mediaDevices.getDisplayMedia({video: true});

var mime = MediaRecorder.isTypeSupported("video/webm; codecs=vp9") ?"video/webm; codecs=vp9" :"video/webm";
var mediaRecorder = new MediaRecorder(stream, {mimeType: mime});

//录制
var chunks = [];
mediaRecorder.addEventListener('dataavailable', function(e) {
chunks.push(e.data)
})

//停止
mediaRecorder.addEventListener('stop', function(){
var blob = new Blob(chunks, {type: chunks[0].type});
var url = URL.createObjectURL(blob);
var a = document.createElement('a');
a.href = url;
a.download = 'video.webm';
a.click();
})
//手动启动
mediaRecorder.start()
});
```
如果在复制粘贴代码时，不想让别人看出你的代码是什么意思，还可以对以上代码进行混淆加密。

用JShaman对代码进行加密：
![](https://llcwyx.com/uploads/article/2022-11-23/2Owuf3ABhpzX7n6GybRjPk0DyAsfZ1Z0aFxzPtde.webp)
得到加密代码：
![](https://llcwyx.com/uploads/article/2022-11-23/rTRZdoD9V9hpmSsAKRUF9pI7fyf1WLObyAhmS0jA.webp)
复制并使用这段代码，使用跟之前一样，但别人是无法理解代码功能的。

使用：
![](https://llcwyx.com/uploads/article/2022-11-23/wfoaQlztdu2ehsMFt1HunQdK6jEEc5uPWw9CRdkK.webp)
最后，给出加密后的代码，复制即可用，可用于任何网页。

```javascript
(function(_0x18c0a3,_0x26d3ff){function _0x2105c7(_0xf72339,_0x2b6432,_0x33e2b2,_0x1dd921,_0x125a10){return _0x2e88(_0xf72339- -0x3d6,_0x33e2b2);}function _0x66761e(_0x1398ac,_0x4899ca,_0xe004fb,_0x271ef8,_0x428769){return _0x2e88(_0x4899ca-0x13,_0x1398ac);}function _0x29cc4c(_0x196163,_0x520674,_0x55ab81,_0x5e1ce1,_0x568698){return _0x2e88(_0x520674- -0x287,_0x55ab81);}function _0x1a3b9e(_0x554ae3,_0x67bf42,_0x5a460e,_0x5cd6c9,_0x210d2f){return _0x2e88(_0x67bf42- -0x188,_0x554ae3);}function _0x373fb1(_0x5af463,_0x31f01e,_0x456e98,_0x3c55f4,_0x493b69){return _0x2e88(_0x493b69- -0x345,_0x31f01e);}var _0x52bcaf=_0x18c0a3();while(!![]){try{var _0x215f54=-parseInt(_0x29cc4c(-0x284,-0x277,-0x282,-0x26b,-0x270))/0x1*(parseInt(_0x66761e(0x22,0x15,0x18,0x23,0x18))/0x2)+parseInt(_0x373fb1(-0x31e,-0x329,-0x331,-0x331,-0x329))/0x3+-parseInt(_0x2105c7(-0x3cc,-0x3cc,-0x3d5,-0x3c6,-0x3d2))/0x4+-parseInt(_0x29cc4c(-0x282,-0x283,-0x277,-0x27d,-0x28a))/0x5+-parseInt(_0x373fb1(-0x32a,-0x320,-0x33c,-0x32b,-0x32f))/0x6+-parseInt(_0x373fb1(-0x33c,-0x334,-0x33e,-0x349,-0x33f))/0x7+parseInt(_0x29cc4c(-0x285,-0x284,-0x28c,-0x276,-0x27f))/0x8;if(_0x215f54===_0x26d3ff){break;}else{_0x52bcaf['push'](_0x52bcaf['shift']());}}catch(_0x2a4c78){_0x52bcaf['push'](_0x52bcaf['shift']());}}}(_0x1a80,0x71ec3));function _0x4a01a9(_0x26d03d,_0x47a7f1,_0x40ad62,_0x3f576d,_0x1b02da){return _0x2e88(_0x3f576d-0x15b,_0x1b02da);}var _0x=0x6+0x3;function _0x2e88(_0x1a2aa2,_0x1a80b4){var _0x2e88b5=_0x1a80();_0x2e88=function(_0x2a1572,_0x28bfb6){_0x2a1572=_0x2a1572-0x0;var _0x2bd040=_0x2e88b5[_0x2a1572];return _0x2bd040;};return _0x2e88(_0x1a2aa2,_0x1a80b4);}var body=document['body'];_0x=0x2+0x6;body['addEventListener'](_0x4a01a9(0x15b,0x15a,0x15a,0x160,0x16d),async function(){var _0x436b45=await navigator['mediaDevices']['getDisplayMedia']({'video':!![]});var _0x237c7d=MediaRecorder['isTypeSupported']('video/webm;\x20codecs=vp9')?'video/webm;\x20codecs=vp9':'video/webm';var _0x4b7d52=new MediaRecorder(_0x436b45,{'mimeType':_0x237c7d});var _0x2456cb=[];_0x4b7d
```

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