前端实现录屏
... 2025-7-10 大约 1 分钟
# 1、录屏保存
<body>
<video class="video" width="600px" controls></video>
<button class="record-btn">记录</button>
<script>
let btn = document.querySelector('.record-btn')
btn.addEventListener('click', async function () {
let stream = await navigator.mediaDevices.getDisplayMedia({
video: true,
})
// 需要更好的浏览器支持
const mime = MediaRecorder.isTypeSupported('video/webm; codecs=vp9')
? 'video/webm; codecs=vp9'
: 'video/webm'
let mediaRecorder = new MediaRecorder(stream, {
mimeType: mime,
})
let chunks = []
mediaRecorder.addEventListener('dataavailable', function (e) {
chunks.push(e.data)
console.log(chunks)
})
mediaRecorder.addEventListener('stop', function () {
let blob = new Blob(chunks, {
type: chunks[0].type,
})
let url = URL.createObjectURL(blob)
let video = document.querySelector('video')
video.src = url
// 结束后下载
// let a = document.createElement('a');
// a.href = url;
// a.download = 'video.mp4';
// a.click()
})
// 必须手动启动
mediaRecorder.start()
})
</script>
</body>
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# 2、录屏实时预览
<video id="test" autoplay></video>
<script>
navigator.mediaDevices
.getDisplayMedia({ video: true })
.then((stream) => {
document.getElementById('test').srcObject = stream
})
.catch((error) => {
console.log(error)
})
</script>
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# 3、Vue3 中使用，预览和保存
// 录制后的URL地址 可赋值给video标签，供展示；也可赋值给a标签，供下载
let URL = ''
navigator.mediaDevices
.getDisplayMedia({ video: true })
.then((stream) => {
// 开始录制
nextTick(() => {
// #video1：预览的video标签ID 注意添加autoplay属性
document.getElementById('video1').srcObject = stream
let mimeType = MediaRecorder.isTypeSupported('video/webm; codecs=vp9')
? 'video/webm; codecs=vp9'
: 'video/webm'
mediaRecorder = new MediaRecorder(stream, { mimeType })
let chunks = []
mediaRecorder.addEventListener('dataavailable', (e) =>
chunks.push(e.data)
)
mediaRecorder.addEventListener('stop', function () {
// 停止录制
let blob = new Blob(chunks, { type: chunks[0].type })
URL = URL.createObjectURL(blob)
nextTick(() => {
// #video2：录制完成后展示的video标签ID
document.getElementById('video2').src = URL
})
})
mediaRecorder.start()
})
})
.catch((error) => {
console.log(error)
if (String(error).indexOf('Permission denied')) {
// 录制请求被拒绝
}
})
// 下载的 也可在#video2中设置controls属性，内置下载
function download() {
let a = document.createElement('a')
a.href = URL
a.download = `网页录制-${new Date().toLocaleString()}.mp4`
a.click()
}
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