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语法高亮，滚动条美化，设置页面调整
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fofolee
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<div></div>
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<p>该 <code><strong>ArrayBuffer[@@species]</strong></code> 访问器属性会返回 <code>ArrayBuffer</code> 构造器。</p>
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<h2 id="语法">语法</h2>
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<pre class="syntaxbox">ArrayBuffer[Symbol.species]
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</pre>
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<pre><code class="language-javascript">ArrayBuffer[Symbol.species]
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</code></pre>
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<h2 id="描述">描述</h2>
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<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>
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<h2 id="示例">示例</h2>
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<p>返回默认的 <code>ArrayBuffer</code> 构造器：</p>
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<pre class="brush: js">ArrayBuffer[Symbol.species]; // function ArrayBuffer()</pre>
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<pre><code class="language-javascript">ArrayBuffer[Symbol.species]; // function ArrayBuffer()</code></pre>
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<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>
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<pre class="brush: js">class MyArrayBuffer extends ArrayBuffer {
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<pre><code class="language-javascript">class MyArrayBuffer extends ArrayBuffer {
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// Overwrite MyArrayBuffer species to the parent ArrayBuffer constructor
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static get [Symbol.species]() { return ArrayBuffer; }
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}</pre>
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}</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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@@ -4,14 +4,14 @@
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<div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/arraybuffer-bytelength.html" width="100%"></iframe></div>
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<p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a class="external" href="https://github.com/mdn/interactive-examples" rel="noopener">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
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<h2 id="语法">语法</h2>
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<pre class="syntaxbox"><var>arr</var>aybuffer.byteLength</pre>
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<pre><code class="language-javascript"><var>arr</var>aybuffer.byteLength</code></pre>
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<h2 id="描述">描述</h2>
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<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>
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<p> </p>
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<h2 id="示例">示例</h2>
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<pre class="brush:js">var buffer = new ArrayBuffer(8);
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<pre><code class="language-js">var buffer = new ArrayBuffer(8);
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buffer.byteLength; // 8
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</pre>
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</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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@@ -5,14 +5,14 @@
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<div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/arraybuffer-isview.html" width="100%"></iframe></div>
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<p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a class="external" href="https://github.com/mdn/interactive-examples" rel="noopener">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
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<h2 id="语法">语法</h2>
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<pre class="syntaxbox"><code>ArrayBuffer.isView(<var>arg</var>)</code></pre>
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<pre><code class="language-javascript"><code>ArrayBuffer.isView(<var>arg</var>)</code></code></pre>
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<h3 id="Parameters（参数）">Parameters（参数）</h3>
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<dl>
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<dt><code>arg</code><br/>
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被检测的语句。</dt>
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</dl>
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<h2 id="示例">示例</h2>
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<pre class="brush: js">ArrayBuffer.isView(); // false
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<pre><code class="language-javascript">ArrayBuffer.isView(); // false
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ArrayBuffer.isView([]); // false
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ArrayBuffer.isView({}); // false
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ArrayBuffer.isView(null); // false
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@@ -26,7 +26,7 @@ ArrayBuffer.isView(new Int8Array(10).subarray(0, 3)); // true
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var buffer = new ArrayBuffer(2);
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var dv = new DataView(buffer);
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ArrayBuffer.isView(dv); // true
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</pre>
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</code></pre>
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<h2 id="说明文档">说明文档</h2>
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<table class="standard-table">
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<tbody>
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@@ -4,7 +4,7 @@
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<div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/arraybuffer-slice.html" width="100%"></iframe></div>
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<p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a class="external" href="https://github.com/mdn/interactive-examples" rel="noopener">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
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<h2 id="语法">语法</h2>
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<pre class="syntaxbox">arraybuffer.slice(begin[, end])</pre>
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<pre><code class="language-javascript">arraybuffer.slice(begin[, end])</code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt><code>begin</code></dt>
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@@ -20,9 +20,9 @@
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<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>
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<h2 id="示例">示例</h2>
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<h3 id="复制一个_ArrayBuffer">复制一个 <code>ArrayBuffer</code></h3>
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<pre class="brush: js">var buf1 = new ArrayBuffer(8);
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<pre><code class="language-javascript">var buf1 = new ArrayBuffer(8);
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var buf2 = buf1.slice(0);
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</pre>
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</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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@@ -4,7 +4,7 @@
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</div></div>
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<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>
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<h2 id="语法">语法</h2>
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<pre class="syntaxbox">ArrayBuffer.transfer(oldBuffer [, newByteLength]);</pre>
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<pre><code class="language-javascript">ArrayBuffer.transfer(oldBuffer [, newByteLength]);</code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt><code>oldBuffer</code></dt>
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@@ -17,7 +17,7 @@
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<h2 id="描述">描述</h2>
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<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>
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<h2 id="示例">示例</h2>
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<pre class="brush: js">var buf1 = new ArrayBuffer(40);
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<pre><code class="language-javascript">var buf1 = new ArrayBuffer(40);
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new Int32Array(buf1)[0] = 42;
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var buf2 = ArrayBuffer.transfer(buf1, 80);
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@@ -28,7 +28,7 @@ new Int32Array(buf2)[0]; // 42
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var buf3 = ArrayBuffer.transfer(buf2, 0);
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buf2.byteLength; // 0 but if you use the polyfill then the value is still 80
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buf3.byteLength; // 0
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</pre>
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</code></pre>
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<h2 id="Polyfill">Polyfill</h2>
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<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>
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<pre>if(!ArrayBuffer.transfer) {
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@@ -81,7 +81,7 @@ buf3.byteLength; // 0
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}
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}
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};
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}</pre>
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}</code></pre>
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<h2 id="规范">规范</h2>
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<p>Not part of any current specification draft document, but <a class="external" href="https://esdiscuss.org/topic/sept-23-2014-meeting-notes" rel="noopener">has been</a> <a class="external" href="https://gist.github.com/lukewagner/2735af7eea411e18cf20" rel="noopener">proposed</a> for a future ECMA-262 edition.</p>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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