js10行代码实现屏幕录制

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