目录
一、背景:
二、具体解决方法
一、背景:
angular 调用 MediaRecorder 来使用麦克风获取声音,(具体要求:angular 前端 按键调用 麦克风,松开按键生成音频文件)代码如下(来自通义千问)
----- HTML ------------------
<button (mousedown)="startRecording()" (mouseup)="stopRecording()">Record</button>
<audio #audioPlayer controls></audio>
---- Typescrip -----------------------
import { Component, OnInit, ViewChild } from '@angular/core';
Component({
 selector: 'app-recorder',
 templateUrl: './recorder.component.html',
 styleUrls: ['./recorder.component.css']
)
xport class RecorderComponent implements OnInit {
 @ViewChild('audioPlayer') audioPlayer;
  private chunks = [];
  private mediaRecorder;
  private stream;
  constructor() {}
  ngOnInit() {
    // 请求麦克风权限
    navigator.mediaDevices.getUserMedia({ audio: true })
      .then(stream => {
        this.stream = stream;
        this.mediaRecorder = new MediaRecorder(stream);
        this.mediaRecorder.addEventListener('dataavailable', this.handleDataAvailable.bind(this));
      });
  }
  startRecording() {
    this.mediaRecorder.start();
  }
  stopRecording() {
    this.mediaRecorder.stop();
    this.chunks = [];
    this.stream.getTracks().forEach(track => track.stop());
  }
  handleDataAvailable(event) {
    if (event.data.size > 0) {
      this.chunks.push(event.data);
    }
  }
  downloadBlob(blob: Blob) {
    const url = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    document.body.appendChild(a);
    a.style = 'display: none';
    a.href = url;
    a.download = 'recording.wav';
    a.click();
    window.URL.revokeObjectURL(url);
  }
  ngAfterViewInit() {
    this.mediaRecorder.addEventListener('stop', () => {
      const blob = new Blob(this.chunks, { type: 'audio/wav' });
      this.downloadBlob(blob);
      this.audioPlayer.nativeElement.src = URL.createObjectURL(blob);
    });
  }
}编译报错:Cannot find name 'MediaRecorder'

找了半天都说 MediaRecorder 是 Web API ,不存在依赖问题,只要在 tsconfig.json 上面配上 "lib": ["dom", "es2018"] 就可以了,试了还是不行

后面找到了一篇文章,说要加上 type 和 安装 @types/dom-mediacapture-record
【量角器单元测试角不适用于MediaRecorder:量角器单元测试角不适用于MediaRecorder-腾讯云开发者社区-腾讯云,
原文:Protractor unit tests Angular does not work with MediaRecorder:Protractor unit tests Angular does not work with MediaRecorder - Stack Overflow】
二、具体解决方法
以下只是我尝试之后,编译不再报错了的解决方法。本人对 angular 的各种属性还不太熟悉,所以只是把报错解决了,不一定能解决实际问题。
① 安装 @types/dom-mediacapture-record
npm install --save-dev @types/dom-mediacapture-record② tsconfig.json 加上 dom.iterable
"lib": ["dom", "dom.iterable", "es2018"],
③ tsconfig.app.json 加上 "types": ["node", "dom-mediacapture-record"]

④ 以 ssl 方式启动
ng serve --configuration=dev --port 4205 --host 0.0.0.0 -o ---ssl true


















