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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
commit33058f2b292b3a581333bdfb21b8f671898c5060 (patch)
tree51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/javascript/reference/global_objects/arraybuffer
parent8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff)
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-rw-r--r--files/zh-cn/web/javascript/reference/global_objects/arraybuffer/prototype/index.html63
-rw-r--r--files/zh-cn/web/javascript/reference/global_objects/arraybuffer/slice/index.html83
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diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/@@species/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/@@species/index.html
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@@ -0,0 +1,70 @@
+---
+title: 'get ArrayBuffer[@@species]'
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/@@species
+tags:
+ - ArrayBuffer
+ - JavaScript
+ - TypedArrays
+ - 属性
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/@@species
+---
+<div>{{JSRef}}</div>
+
+<p>该 <code><strong>ArrayBuffer[@@species]</strong></code> 访问器属性会返回 <code>ArrayBuffer</code> 构造器。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">ArrayBuffer[Symbol.species]
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>这个 species 访问器属性会返回默认的 <code>ArrayBuffer</code> 构造器。子类构造器可能会覆盖它以改变构造器赋值。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>返回默认的 <code>ArrayBuffer</code> 构造器:</p>
+
+<pre class="brush: js">ArrayBuffer[Symbol.species]; // function ArrayBuffer()</pre>
+
+<p>在派生集合对象中(比如你定制的 array buffer <code>MyArrayBuffer</code>),<code>MyArrayBuffer</code> species 就是 <code>MyArrayBuffer</code> 构造器。但是,你可能想要在派生类里重写它,以期返回的是父类的 <code>ArrayBuffer</code> 对象:</p>
+
+<pre class="brush: js">class MyArrayBuffer extends ArrayBuffer {
+ // Overwrite MyArrayBuffer species to the parent ArrayBuffer constructor
+ static get [Symbol.species]() { return ArrayBuffer; }
+}</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-get-arraybuffer-@@species', 'get ArrayBuffer [ @@species ]')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-get-arraybuffer-@@species', 'get ArrayBuffer [ @@species ]')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.@@species")}}</p>
+
+<h2 id="相关">相关</h2>
+
+<ul>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+ <li>{{jsxref("Symbol.species")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/bytelength/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/bytelength/index.html
new file mode 100644
index 0000000000..af8868a563
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/bytelength/index.html
@@ -0,0 +1,62 @@
+---
+title: ArrayBuffer.prototype.byteLength
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/byteLength
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/byteLength
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>byteLength</strong>访问器属性</code>表示一个{{jsxref("ArrayBuffer")}} 对象的字节长度。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/arraybuffer-bytelength.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>arr</var>aybuffer.byteLength</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>byteLength属性是一个访问器属性,它的set访问器函数是undefined,这意味着你只能读这个属性。 该值在数组创建时确定,并且不可变更。如果这个<code>ArrayBuffer</code> 被移除,则此属性返回0。</p>
+
+<p> </p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush:js">var buffer = new ArrayBuffer(8);
+buffer.byteLength; // 8
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">规范</th>
+ <th scope="col">状态</th>
+ <th scope="col">备注</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Typed Array')}}</td>
+ <td>{{Spec2('Typed Array')}}</td>
+ <td>Superseded by ECMAScript 6.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-get-arraybuffer.prototype.bytelength', 'ArrayBuffer.prototype.byteLength')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Initial definition in an ECMA standard.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.byteLength")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/index.html
new file mode 100644
index 0000000000..a98aca4290
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/index.html
@@ -0,0 +1,161 @@
+---
+title: ArrayBuffer
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer
+tags:
+ - ArrayBuffer
+ - JavaScript
+ - 构造函数
+ - 类型数组
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer
+---
+<div>
+<p>{{JSRef}}</p>
+
+<p><strong><code>ArrayBuffer</code></strong> 对象用来表示通用的、固定长度的原始二进制数据缓冲区。</p>
+
+<p>它是一个字节数组,通常在其他语言中称为“byte array”。</p>
+
+<p>你不能直接操作 <code>ArrayBuffer</code> 的内容,而是要通过<a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/TypedArray">类型数组对象</a>或 {{jsxref("DataView")}} 对象来操作,它们会将缓冲区中的数据表示为特定的格式,并通过这些格式来读写缓冲区的内容。</p>
+</div>
+
+<div>{{EmbedInteractiveExample("pages/js/arraybuffer-constructor.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">new ArrayBuffer(length)
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>length</code></dt>
+ <dd>要创建的 <code>ArrayBuffer</code> 的大小,单位为字节。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个指定大小的 <code>ArrayBuffer</code> 对象,其内容被初始化为 0。</p>
+
+<h3 id="异常">异常</h3>
+
+<p>如果 <font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">length</span></font> 大于 {{jsxref("Number.MAX_SAFE_INTEGER")}}(&gt;= 2 ** 53)或为负数,则抛出一个  {{jsxref("RangeError")}}  异常。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>ArrayBuffer</code> 构造函数用来创建一个指定字节长度的 <code>ArrayBuffer</code> 对象。</p>
+
+<h3 id="以现有数据获取_ArrayBuffer">以现有数据获取 ArrayBuffer</h3>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#Appendix.3A_Decode_a_Base64_string_to_Uint8Array_or_ArrayBuffer">从 Base64 字符串</a></li>
+ <li><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/FileReader#readAsArrayBuffer()">从本地文件</a></li>
+</ul>
+
+<h2 id="属性">属性</h2>
+
+<dl>
+ <dt><code>ArrayBuffer.length</code></dt>
+ <dd>ArrayBuffer 构造函数的 length 属性,其值为1。</dd>
+</dl>
+
+<dl>
+ <dt>{{jsxref("ArrayBuffer.prototype.byteLength")}}</dt>
+ <dd>只读属性,表示 <code>ArrayBuffer</code> 的byte的大小,在ArrayBuffer构造完成时生成,不可改变。</dd>
+</dl>
+
+<dl>
+ <dt>{{jsxref("ArrayBuffer.@@species", "get ArrayBuffer[@@species]")}}</dt>
+ <dd>返回 ArrayBuffer 的构造函数。</dd>
+ <dt>{{jsxref("ArrayBuffer.prototype")}}</dt>
+ <dd>通过 ArrayBuffer 的原型对象可以为所有 ArrayBuffer 对象添加属性。</dd>
+</dl>
+
+<h2 id="方法">方法</h2>
+
+<dl>
+ <dt>{{jsxref("ArrayBuffer.isView", "ArrayBuffer.isView(arg)")}}</dt>
+ <dd>如果参数是 ArrayBuffer 的视图实例则返回 <code>true</code>,例如 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/TypedArray">类型数组对象</a> 或 {{jsxref("DataView")}} 对象;否则返回 <code>false</code>。</dd>
+ <dt>{{jsxref("ArrayBuffer.transfer", "ArrayBuffer.transfer(oldBuffer [, newByteLength])")}} {{experimental_inline}}</dt>
+ <dd>
+ <p>返回一个新的 ArrayBuffer 对象,其内容取自 <code>oldBuffer</code> 中的数据,并且根据 <code>newByteLength</code> 的大小对数据进行截取或补 0。</p>
+ </dd>
+</dl>
+
+<h2 id="ArrayBuffer_实例">ArrayBuffer 实例</h2>
+
+<p>所有 <code>ArrayBuffer</code> 实例都会从 {{jsxref("ArrayBuffer.prototype")}} 继承属性和方法。</p>
+
+<h3 id="属性_2">属性</h3>
+
+<p>{{page('zh-CN/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/prototype','属性')}}</p>
+
+<h3 id="方法_2">方法</h3>
+
+<p>{{page('zh-CN/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/prototype','方法')}}</p>
+
+<dl>
+ <dt>{{jsxref("ArrayBuffer.slice()")}} {{non-standard_inline}}</dt>
+ <dd>和 {{jsxref("ArrayBuffer.prototype.slice()")}} 功能相同。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的例子创建了一个 8 字节的缓冲区,并使用一个 {{jsxref("Global_Objects/Int32Array", "Int32Array")}} 来引用它:</p>
+
+<pre class="notranslate"><code>var buffer = new ArrayBuffer(8);
+var view = new Int32Array(buffer);</code>
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Typed Array')}}</td>
+ <td>{{Spec2('Typed Array')}}</td>
+ <td>已被 ECMAScript 6 中的 ArrayBuffer 取代</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-arraybuffer-constructor', 'ArrayBuffer')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>在 ECMA 标准中的初始定义。规定了必须通过 <code>new</code> 来调用构造函数</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-arraybuffer-constructor', 'ArrayBuffer')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">
+<p>The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+</div>
+
+<p>{{Compat("javascript.builtins.ArrayBuffer")}}</p>
+
+<h2 id="兼容性提醒">兼容性提醒</h2>
+
+<p>从 ECMAScript 2015 开始,<code>ArrayBuffer</code> 对象需要用 {{jsxref("Operators/new", "new")}} 运算符创建。如果调用构造函数时没有使用 <code>new</code>,将会抛出 {{jsxref("TypeError")}}  异常。</p>
+
+<pre class="brush: js example-bad notranslate">var dv = ArrayBuffer(10);
+// TypeError: calling a builtin ArrayBuffer constructor
+// without new is forbidden</pre>
+
+<pre class="brush: js example-good notranslate">var dv = new ArrayBuffer(10);</pre>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Typed_arrays">JavaScript 类型数组</a></li>
+ <li><a href="zh-CN/docs/Web/JavaScript/Typed_arrays" title="zh-CN/JavaScript typed arrays">{{jsxref("SharedArrayBuffer")}}</a></li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/isview/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/isview/index.html
new file mode 100644
index 0000000000..2b545d9c03
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/isview/index.html
@@ -0,0 +1,87 @@
+---
+title: ArrayBuffer.isView()
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView
+tags:
+ - 类型数组
+ - 缓冲区
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>ArrayBuffer.isView()</strong></code> 方法用来判断传入的参数值是否是一种 <code>ArrayBuffer</code> 视图(view),比如类型化数组对象(<a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray">typed array objects</a>)或者数据视图( {{jsxref("DataView")}})。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/arraybuffer-isview.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js"><code>ArrayBuffer.isView(<var>value</var>)</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>被检测的值。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<dl>
+ <dt><code>true</code></dt>
+ <dd>如果提供的参数是一种 {{jsxref("ArrayBuffer")}} 视图;</dd>
+ <dt><code>false</code></dt>
+ <dd>提供的参数不是一种 {{jsxref("ArrayBuffer")}} 视图类型;</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">ArrayBuffer.isView(); // false
+ArrayBuffer.isView([]); // false
+ArrayBuffer.isView({}); // false
+ArrayBuffer.isView(null); // false
+ArrayBuffer.isView(undefined); // false
+ArrayBuffer.isView(new ArrayBuffer(10)); // false
+
+ArrayBuffer.isView(new Uint8Array()); // true
+ArrayBuffer.isView(new Float32Array()); // true
+ArrayBuffer.isView(new Int8Array(10).subarray(0, 3)); // true
+
+var buffer = new ArrayBuffer(2);
+var dv = new DataView(buffer);
+ArrayBuffer.isView(dv); // true
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Typed Array')}}</td>
+ <td>{{Spec2('Typed Array')}}</td>
+ <td>Superseded by ECMAScript 6.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-arraybuffer.isview', 'ArrayBuffer.isView')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Initial definition in an ECMA standard.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.isView")}}</p>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays" title="en/JavaScript typed arrays">JavaScript typed arrays</a></li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/prototype/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/prototype/index.html
new file mode 100644
index 0000000000..376e969064
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/prototype/index.html
@@ -0,0 +1,63 @@
+---
+title: ArrayBuffer.prototype
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/prototype
+tags:
+ - ArrayBuffer
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>ArrayBuffer.prototype</code></strong><code>属性表示</code>{{jsxref("ArrayBuffer")}}对象的原型。</p>
+
+<div>{{js_property_attributes(0,0,0)}}</div>
+
+<div> </div>
+
+<h2 id="描述">描述</h2>
+
+<p>ArrayBuffer 实例继承自<code>ArrayBuffer.prototype。对所有的构造函数来说,你可以通过改变构造函数的原型对象来改变所有的ArrayBuffer实例。</code></p>
+
+<h2 id="属性">属性</h2>
+
+<dl>
+ <dt>ArrayBuffer.prototype.constructor</dt>
+ <dd>指定函数,它创建一个对象的原型。其初始值是标准ArrayBuffer内置构造函数。</dd>
+ <dt>{{jsxref("ArrayBuffer.prototype.byteLength")}} {{readonlyInline}}</dt>
+ <dd>数组的字节大小。在数组创建时确定,并且不可变更。<strong>只读</strong>。</dd>
+</dl>
+
+<h2 id="方法">方法</h2>
+
+<dl>
+ <dt>{{jsxref("ArrayBuffer.prototype.slice()")}}</dt>
+ <dd>返回一个新的 <code>ArrayBuffer</code> ,它的内容是这个 <code>ArrayBuffer</code> 的字节副本,从begin(包括),到end(不包括)。如果begin或end是负数,则指的是从数组末尾开始的索引,而不是从头开始。</dd>
+</dl>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">规范</th>
+ <th scope="col">状态</th>
+ <th scope="col">备注</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-arraybuffer.prototype', 'ArrayBuffer.prototype')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>初始定义</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.prototype")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/slice/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/slice/index.html
new file mode 100644
index 0000000000..2c03d1e13c
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/slice/index.html
@@ -0,0 +1,83 @@
+---
+title: ArrayBuffer.prototype.slice()
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/slice
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/slice
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>slice()</strong></code>方法返回一个新的 <code>ArrayBuffer</code> ,它的内容是这个<code>ArrayBuffer的</code>字节副本,从begin(包括),到end(不包括)。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/arraybuffer-slice.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">arraybuffer.slice(begin[, end])</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>begin</code></dt>
+ <dd>从零开始的字节索引,切片从这开始。</dd>
+</dl>
+
+<dl>
+ <dt><code>end</code></dt>
+ <dd>结束切片的字节索引。如果没指定end,新的 <code>ArrayBuffer</code> 将包含这个 <code>ArrayBuffer</code> 从头到尾的所有字节。由begin和end指定的这个范围夹在当前数组的有效索引范围内。如果新<code>ArrayBuffer</code>的长度在计算后为负,它将强制为0 。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p> 一个新的 <code>ArrayBuffer</code> 对象。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>slice</code> 方法复制到但不包括由end参数指示的字节。如果begin或end是负数,则指的是从数组末尾开始的索引,而不是从头开始。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="复制一个_ArrayBuffer">复制一个 <code>ArrayBuffer</code></h3>
+
+<pre class="brush: js">var buf1 = new ArrayBuffer(8);
+var buf2 = buf1.slice(0);
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Typed Array')}}</td>
+ <td>{{Spec2('Typed Array')}}</td>
+ <td>Superseded by EMCAScript 6.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-arraybuffer.prototype.slice', 'ArrayBuffer.prototype.slice')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Initial definition in an ECMA standard.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-arraybuffer.prototype.slice', 'ArrayBuffer.prototype.slice')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.slice")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/transfer/index.html b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/transfer/index.html
new file mode 100644
index 0000000000..cf3185f637
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/arraybuffer/transfer/index.html
@@ -0,0 +1,116 @@
+---
+title: ArrayBuffer.transfer()
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/transfer
+translation_of: Archive/Web/JavaScript/ArrayBuffer.transfer
+---
+<div>{{JSRef}} {{SeeCompatTable}}</div>
+
+<p> 静态<code><strong>ArrayBuf</strong></code><strong>fer.transfer()</strong> 方法返回一个新的ArrayBuffer, 其内容取自oldBuffer的数据,并且根据 newByteLength 的大小来对数据进行截取或者以0扩展。 如果 newByteLength 未定义,则使用 oldBuffer 的byteLength。这个操作使得 oldBuffer 处于被移除的状态。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">ArrayBuffer.transfer(oldBuffer [, newByteLength]);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>oldBuffer</code></dt>
+ <dd> 要转移的{{jsxref("ArrayBuffer")}}对象。</dd>
+ <dt>newByteLength</dt>
+ <dd>新 <code>ArrayBuffer</code> 对象的字节长度。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的ArrayBuffer对象。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>ArrayBuffer.transfer()</code>方法允许你增长和移除 <code>ArrayBuffer</code> 对象。不需复制就能增长一个ArrayBuffer的功能,对于大的缓冲区来说,有速度优势 (类似realloc) 。当释放底层内存时,移除ArrayBuffer的功能给开发者提供了显式控制。这避免了必须丢弃所有引用和等待垃圾回收。</p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">var buf1 = new ArrayBuffer(40);
+new Int32Array(buf1)[0] = 42;
+
+var buf2 = ArrayBuffer.transfer(buf1, 80);
+buf1.byteLength; // 0 but if you use the polyfill then the value is still 40
+buf2.byteLength; // 80
+new Int32Array(buf2)[0]; // 42
+
+var buf3 = ArrayBuffer.transfer(buf2, 0);
+buf2.byteLength; // 0 but if you use the polyfill then the value is still 80
+buf3.byteLength; // 0
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>You can partially work around this by inserting the following code at the beginning of your scripts, allowing use of much of the functionality of transfer<font face="Consolas, Liberation Mono, Courier, monospace">()</font> in implementations that do not natively support it. This is not the exact equivalent of this API, but this function transfers data from one ArrayBuffer to another ArrayBuffer.</p>
+
+<pre>if(!ArrayBuffer.transfer) {
+ ArrayBuffer.transfer = function (source, length) {
+ source = Object(source);
+ var dest = new ArrayBuffer(length);
+ if(!(source instanceof ArrayBuffer) || !(dest instanceof ArrayBuffer)) {
+ throw new TypeError("Source and destination must be ArrayBuffer instances");
+ }
+ if(dest.byteLength &gt;= source.byteLength) {
+ var nextOffset = 0;
+ var leftBytes = source.byteLength;
+ var wordSizes = [8, 4, 2, 1];
+ wordSizes.forEach(function (_wordSize_) {
+ if (leftBytes &gt;= _wordSize_) {
+ var done = transferWith(_wordSize_, source, dest, nextOffset, leftBytes);
+ nextOffset = done.nextOffset;
+ leftBytes = done.leftBytes;
+ }
+ });
+ }
+ return dest;
+ function transferWith(wordSize, source, dest, nextOffset, leftBytes) {
+ var ViewClass = Uint8Array;
+ switch (wordSize) {
+ case 8:
+ ViewClass = Float64Array;
+ break;
+ case 4:
+ ViewClass = Float32Array;
+ break;
+ case 2:
+ ViewClass = Uint16Array;
+ break;
+ case 1:
+ ViewClass = Uint8Array;
+ break;
+ default:
+ ViewClass = Uint8Array;
+ break;
+ }
+ var view_source = new ViewClass(source, nextOffset, Math.trunc(leftBytes / wordSize));
+ var view_dest = new ViewClass(dest, nextOffset, Math.trunc(leftBytes / wordSize));
+ for(var i=0; i&lt;view_dest.length; i++) {
+ view_dest[i] = view_source[i];
+ }
+ return {
+ nextOffset : view_source.byteOffset + view_source.byteLength,
+ leftBytes : source.byteLength - (view_source.byteOffset + view_source.byteLength)
+ }
+ }
+ };
+}</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>Not part of any current specification draft document, but <a href="https://esdiscuss.org/topic/sept-23-2014-meeting-notes">has been</a> <a href="https://gist.github.com/lukewagner/2735af7eea411e18cf20">proposed</a> for a future ECMA-262 edition.</p>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.transfer")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays" title="en/JavaScript typed arrays">JavaScript typed arrays</a></li>
+</ul>