Response.arrayBuffer()

Experimental: 这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

Response上的方法 arrayBuffer() 接受一个 Response 流，并等待其读取完成。它返回一个 promise 实例，并 resolve 一个 ArrayBuffer 对象。

语法

response.arrayBuffer().then(function(buffer) {
  // do something with buffer
)};

参数

无。

返回值

A promise that resolves with an ArrayBuffer.

例子

In our fetch array buffer example (run fetch array buffer live), we have a Play button. When pressed, the getData() function is run.

In getData() we create a new request using the Request.Request constructor, then use it to fetch an OGG music track. We also use AudioContext.createBufferSource to create an audio buffer source. When the fetch is successful, we read an ArrayBuffer out of the response using arrayBuffer(), decode the audio data using AudioContext.decodeAudioData, set the decoded data as the audio buffer source's buffer (source.buffer), then connect the source up to the AudioContext.destination.

Once getData() has finished running, we start the audio source playing with start(0), then disable the play button so it can't be clicked again when it is already playing (this would cause an error.)

function getData() {
  source = audioCtx.createBufferSource();

  var myRequest = new Request('viper.ogg');

  fetch(myRequest).then(function(response) {
    response.arrayBuffer().then(function(buffer) {
      audioCtx.decodeAudioData(buffer, function(decodedData) {
        source.buffer = decodedData;
        source.connect(audioCtx.destination);
      });
    });
  });
};

// wire up buttons to stop and play audio

play.onclick = function() {
  getData();
  source.start(0);
  play.setAttribute('disabled', 'disabled');
}

规范

Specification
Fetch Standard
# ref-for-dom-body-arraybuffer①

浏览器兼容性

BCD tables only load in the browser

参考