From 218934fa2ed1c702a6d3923d2aa2cc6b43c48684 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:43:23 -0500 Subject: initial commit --- .../global_objects/arraybuffer/index.html | 225 +++++++++++++++++++++ 1 file changed, 225 insertions(+) create mode 100644 files/zh-tw/web/javascript/reference/global_objects/arraybuffer/index.html (limited to 'files/zh-tw/web/javascript/reference/global_objects/arraybuffer/index.html') diff --git a/files/zh-tw/web/javascript/reference/global_objects/arraybuffer/index.html b/files/zh-tw/web/javascript/reference/global_objects/arraybuffer/index.html new file mode 100644 index 0000000000..1fa59e5f0f --- /dev/null +++ b/files/zh-tw/web/javascript/reference/global_objects/arraybuffer/index.html @@ -0,0 +1,225 @@ +--- +title: ArrayBuffer +slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer +translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer +--- +

{{JSRef}}

+ +

ArrayBuffer 物件是一種表示通用、固定大小的原始二進制資料緩衝。想要直接操作一個 ArrayBuffer 物件的內容是不可能的。若要讀寫該緩衝的內容則必須透過視圖，可以選擇建立一個 {{jsxref("DataView")}} 視圖物件或是一個限定其成員為某種型別的 {{jsxref("TypedArray")}} 視圖物件，它們皆能以特定的型別解讀、修改 ArrayBuffer。

+ +

語法

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new ArrayBuffer(length)
+
+ +

參數

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+
length
+
要建立的緩衝陣列大小，以位元組（byte）計算。
+
+ +

回傳值

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為一個新建立的指定大小 ArrayBuffer 物件，其內容皆初始化為 0。

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Exceptions

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A {{jsxref("RangeError")}} is thrown if the length is larger than {{jsxref("Number.MAX_SAFE_INTEGER")}} (>= 2 ** 53) or negative.

+ +

說明

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The ArrayBuffer constructor creates a new ArrayBuffer of the given length in bytes.

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從既有的資料取得 ArrayBuffer

+ + + +

屬性

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+
ArrayBuffer.length
+
The ArrayBuffer constructor's length property whose value is 1.
+
{{jsxref("ArrayBuffer.@@species", "get ArrayBuffer[@@species]")}}
+
The constructor function that is used to create derived objects.
+
{{jsxref("ArrayBuffer.prototype")}}
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Allows the addition of properties to all ArrayBuffer objects.
+
+ +

方法

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+
{{jsxref("ArrayBuffer.isView", "ArrayBuffer.isView(arg)")}}
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Returns true if arg is one of the ArrayBuffer views, such as typed array objects or a {{jsxref("DataView")}}. Returns false otherwise.
+
{{jsxref("ArrayBuffer.transfer", "ArrayBuffer.transfer(oldBuffer [, newByteLength])")}} {{experimental_inline}}
+
+
Returns a new ArrayBuffer whose contents are taken from the oldBuffer's data and then is either truncated or zero-extended by newByteLength.
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+
+ +

ArrayBuffer 實例

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所有的 ArrayBuffer 物件實例皆繼承自 {{jsxref("ArrayBuffer.prototype")}}.

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屬性

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{{page('zh-TW/Web/JavaScript/JavaScript_typed_arrays/ArrayBuffer/prototype','屬性')}}

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方法

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{{page('/zh-TW/docs/Web/JavaScript/JavaScript_typed_arrays/ArrayBuffer/prototype','方法')}}

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+
{{jsxref("ArrayBuffer.slice()")}} {{non-standard_inline}}
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Has the same functionality as {{jsxref("ArrayBuffer.prototype.slice()")}}.
+
+ +

範例

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In this example, we create a 8-byte buffer with a {{jsxref("Global_Objects/Int32Array", "Int32Array")}} view referring to the buffer:

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var buffer = new ArrayBuffer(8);
+var view   = new Int32Array(buffer);
+ +

規範

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SpecificationStatusComment
{{SpecName('Typed Array')}}{{Spec2('Typed Array')}}Superseded by ECMAScript 6.
{{SpecName('ES6', '#sec-arraybuffer-constructor', 'ArrayBuffer')}}{{Spec2('ES6')}}Initial definition in an ECMA standard. Specified that new is required.
{{SpecName('ESDraft', '#sec-arraybuffer-constructor', 'ArrayBuffer')}}{{Spec2('ESDraft')}} 
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瀏覽器相容性

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{{CompatibilityTable}}

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FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support7.0{{CompatVersionUnknown}}{{CompatGeckoDesktop("2")}}1011.65.1
ArrayBuffer() without new throws{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoDesktop("44")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
ArrayBuffer.slice() {{non-standard_inline}}{{CompatNo}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+ {{CompatNo}} {{CompatGeckoDesktop("53")}}		{{CompatNo}}{{CompatNo}}{{CompatUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidChrome for AndroidEdgeFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support4.0{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatGeckoMobile("2")}}1011.64.2
ArrayBuffer() without new throws{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoMobile("44")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
ArrayBuffer.slice() {{non-standard_inline}}{{CompatNo}}{{CompatNo}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+ {{CompatNo}} {{CompatGeckoMobile("53")}}		{{CompatNo}}{{CompatNo}}{{CompatUnknown}}
+
+ +

相容性備註

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Starting with ECMAScript 2015, ArrayBuffer constructors require to be constructed with a {{jsxref("Operators/new", "new")}} operator. Calling an ArrayBuffer constructor as a function without new, will throw a {{jsxref("TypeError")}} from now on.

+ +
var dv = ArrayBuffer(10);
+// TypeError: calling a builtin ArrayBuffer constructor
+// without new is forbidden
+ +
var dv = new ArrayBuffer(10);
+ +

參見

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