在线录屏-通过Web API接口轻松实现录屏

在线录屏是指在互联网上进行屏幕录制的过程。它允许用户通过网络连接，将自己的屏幕活动记录下来，并可以在需要时进行播放、共享或存档。在线录屏常用于教育、培训、演示、游戏等场景，可以帮助用户展示操作步骤、解决问题、分享经验等。通常，在线录屏工具提供了丰富的功能，例如选择录制区域、添加音频注释、调整录制质量等，以满足用户的不同需求。

工具地址：https://amd794.com/recordscreen

相关说明：
MediaDevices 是 Web API 中的一部分，它提供了访问媒体设备（如摄像头、麦克风等）的功能。通过 MediaDevices 接口，您可以使用 JavaScript 代码来获取和操作媒体设备的流（如音频和视频）。这使得您可以在 Web 应用程序中实现音视频通信、媒体录制和流媒体等功能。
当使用 MediaDevices 接口调用 Web API 时，可以按照以下示例代码进行操作：

// 检查浏览器是否支持 MediaDevices 接口
if (navigator.mediaDevices) {// 获取媒体设备的用户授权navigator.mediaDevices.getUserMedia({ audio: true, video: true }).then(function(stream) {// 获取到媒体流后的处理逻辑// 在这里可以对获取到的音视频流进行操作// 例如：显示视频流、播放音频流等}).catch(function(error) {// 处理获取媒体设备失败的情况console.log('获取媒体设备失败: ' + error.message);});
} else {console.log('您的浏览器不支持 MediaDevices 接口');
}

上述示例代码首先检查浏览器是否支持 MediaDevices 接口。如果支持，它会调用 getUserMedia 方法来请求用户授权访问媒体设备（包括音频和视频）。如果用户授权成功，将返回一个媒体流对象，可以在 .then 方法中对该流进行处理。如果用户拒绝授权或发生其他错误，将在 .catch 方法中处理错误情况。
通过这样的调用方式，您可以使用 MediaDevices 接口来获取媒体设备的流，并对其进行进一步的操作和处理。

浏览器兼容性：
可以说是大部分不支持，毕竟是新的Web API接口，详细可以去MDN中查看MediaDevices - Web API 接口参考 | MDN (mozilla.org)

录屏可以对整个屏幕，某个软件甚至某个进程单独录取。

相关实现代码：
潦草布局一下，毕竟只是个玩具，不需要多华丽。

  <div class="RecordScreen"><div class="Operate"><div class="Content"><div class="flex Start" @click="onStart" v-if="!setState"><el-icon size="50px" color=" var(--el-color-primary)"><VideoCameraFilled/></el-icon><el-button type="primary">{{ currentLang.start }}</el-button></div><div class="flex Pause" @click="onPause" v-if="setState === 'recording'"><el-icon size="50px" color=" var(--el-color-primary)"><VideoPause/></el-icon><el-button type="info">{{ currentLang.stop }}</el-button></div><div class="flex Resume" @click="onResume" v-if="setState === 'paused'"><el-icon size="50px" color=" var(--el-color-primary)"><VideoPlay/></el-icon><el-button type="info">{{ currentLang.continue }}</el-button></div><div class="flex Stop" @click="onStop" v-if="setState"><el-icon size="50px" color=" var(--el-color-primary)"><SwitchButton/></el-icon><el-button type="danger">{{ currentLang.end }}</el-button></div></div><el-divider v-if="VideoURL"/><div class="Operate__Download"><div v-if="!VideoURL"style="width: 100vw;height: 100vh;position: absolute;top: 0;left: 0;z-index: 99999;background-color: var(--el-bg-color);"></div><el-input v-model="DownloadName" placeholder="please input"><template #append>.mp4</template></el-input><el-button type="primary" :icon="Download" @click="onDownload">{{ currentLang.saveVideo }}</el-button></div></div><div class="RecordScreen__state"><div v-if="setState" class="REC"><div></div><div>REC</div></div><el-icon v-if="!VideoURL" size="40vh" color="var(--el-color-primary)"><Monitor/></el-icon><div v-if="setState" class="Timing"><div>{{ Hour }}:{{ Minute }}:{{ Seconds }}</div><div>{{ setState === 'paused' ? currentLang.pauseScreenRecording : currentLang.recordingScreen }}</div></div><video v-if="VideoURL" :src="VideoURL" controls></video></div></div>

简单定义几个变量

const VideoURL = ref('')
const DownloadName = ref('')
const setState = ref('')
let mediaRecorder = null
let mediaThen = null

开始录屏

const onStart = () => {VideoURL.value = ''mediaThen = nullnavigator.mediaDevices.getDisplayMedia({video: true, audio: true}).then(mediaStream => {mediaThen = mediaStreammediaRecorder = new MediaRecorder(mediaStream);Timing()console.log(mediaRecorder)const chunks = [];mediaRecorder.ondataavailable = event => {if (event.data.size > 0) {chunks.push(event.data);}};mediaRecorder.onstop = () => {const blob = new Blob(chunks, {type: 'video/mp4'});const recordedVideoURL = URL.createObjectURL(blob);VideoURL.value = recordedVideoURLsetState.value = '' //inactive};mediaRecorder.start();setState.value = mediaRecorder.state   //recording}).catch(error => {// if (error == 'DOMException: Permission denied') return false// ElMessageBox({//   title: '当前浏览器或设备不支持录屏',//   confirmButtonText: '确定',//   message: h('p', null, [//     h('span', null, error),//   ]),// })});
}

暂停录屏

const onPause = () => {clearTimeout(timer)mediaRecorder.pause()setState.value = mediaRecorder.state   //paused
}

恢复录屏

const onResume = () => {Timing()mediaRecorder.resume()setState.value = mediaRecorder.state   //recording
}

结束录屏

const onStop = () => {mediaRecorder.stop()mediaThen.getTracks().forEach(track => track.stop())setState.value = '' //inactive
}

最后把样式补上


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Flex;justify-content: space-around;height: 100vh;overflow: hidden;box-shadow: var(--el-box-shadow);position: relative;flex-direction: column-reverse;.flex {@include Flex;flex-direction: column;}.Operate {.Content {@include Flex;.Start {@include side;}.Pause {@include side;}.Resume {@include side;}.Stop {@include side;}}&__Download {@include Flex;gap: 10px;position: relative;overflow: hidden;}}&__state {position: relative;border-radius: 1rem;@include Flex;justify-content: space-around;width: 57vmax;height: 70vh;border: 1px dashed var(--el-color-primary);background: #022125 url($bg) center no-repeat;overflow: hidden;.REC {@include Flex;gap: 0.5rem;position: absolute;top: 0.9rem;left: 0.9rem;:first-child {width: 1rem;height: 1rem;border-radius: 50rem;background-color: red;}:last-child {@include font()}}.Timing {display: flex;align-items: flex-start;gap: 1rem;flex-direction: column;:first-child {@include font(2rem, #1fb5c9, 0.3rem);font-weight: 600;font-family: digital-display;}:last-child 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}
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