From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- files/zh-cn/web/api/body/arraybuffer/index.html | 142 ++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 files/zh-cn/web/api/body/arraybuffer/index.html (limited to 'files/zh-cn/web/api/body/arraybuffer') diff --git a/files/zh-cn/web/api/body/arraybuffer/index.html b/files/zh-cn/web/api/body/arraybuffer/index.html new file mode 100644 index 0000000000..3cf99f2e58 --- /dev/null +++ b/files/zh-cn/web/api/body/arraybuffer/index.html @@ -0,0 +1,142 @@ +--- +title: Body.arrayBuffer() +slug: Web/API/Body/arrayBuffer +translation_of: Web/API/Body/arrayBuffer +--- +

{{APIRef("Fetch")}}{{ SeeCompatTable() }}

+ +

 {{domxref("Body")}}上的方法 arrayBuffer() 接受一个 {{domxref("Response")}} 流, 并等待其读取完成. 它返回一个 promise 实例, 并 resolve 一个 {{domxref("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 {{domxref("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 {{domxref("Request.Request")}} constructor, then use it to fetch an OGG music track. We also use {{domxref("AudioContext.createBufferSource")}} to create an audio buffer source.  When the fetch is successful, we read an {{domxref("ArrayBuffer")}} out of the response using arrayBuffer(), decode the audio data using {{domxref("AudioContext.decodeAudioData")}}, set the decoded data as the audio buffer source's buffer (source.buffer), then connect the source up to the {{domxref("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');
+}
+ +

标准

+ + + + + + + + + + + + + + +
标准状态备注
{{SpecName('Fetch','#dom-body-arraybuffer','arrayBuffer()')}}{{Spec2('Fetch')}} 
+ +

浏览器兼容性

+ +

{{ CompatibilityTable() }}

+ +
+ + + + + + + + + + + + + + + + + + + +
FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari (WebKit)
Basic support{{ CompatChrome(41) }}[1]
+ {{ CompatChrome(42) }}
+  		34[1]
+ {{ CompatGeckoDesktop(39)}}		{{ CompatNo }} +

28[1]
+ 29

+ 		{{ CompatNo }}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidFirefox Mobile (Gecko)Firefox OS (Gecko)IE PhoneOpera MobileSafari MobileChrome for Android
Basic support{{ CompatNo }}{{ CompatNo }}{{ CompatNo }}{{ CompatNo }}{{ CompatNo }}{{ CompatNo }}{{ CompatNo }}
+
+ +

[1] In Chrome 42, Firefox 34 and Opera 28 support for arrayBuffer() was hidden behind a preference.

+ +

参考

+ + + + -- cgit v1.2.3-54-g00ecf