uTools-Manuals/docs/javascript/Reference/Global_Objects/Uint32Array.html

<article id="wikiArticle">
<div></div>
<h2 id="概要">概要</h2>
<p><strong><code>Uint32Array</code></strong>表示一个由基于平台字节序的32位无符号字节组成的数组.如果需要对字节顺序进行控制(译者注:即 littleEndian 或 bigEndian),请使用<a href="Reference/Global_Objects/DataView" title="DataView 视图是一个可以从 ArrayBuffer 对象中读写多种数值类型的底层接口，在读写时不用考虑平台字节序问题。"><code>DataView</code></a>代替.数组中每个元素的初始值都是0.一旦创建，你可以用对象的方法引用数组里的元素，或者使用标准的数组索引语法（即，使用中括号）。</p>
<h2 id="语法">语法</h2>
<pre><code class="language-javascript">new Uint32Array(); // new in ES2017
new Uint32Array(length);
new Uint32Array(typedArray);
new Uint32Array(object);
new Uint32Array(buffer [, byteOffset [, length]]);</code></pre>
<p>更多的构造器语法和属性请参照 <em><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray#Syntax">TypedArray</a>。</em></p>
<h2 id="属性">属性</h2>
<dl>
<dt><a href="Reference/Global_Objects/TypedArray/BYTES_PER_ELEMENT" title="TypedArray.BYTES_PER_ELEMENT 属性代表了强类型数组中每个元素所占用的字节数。"><code>Uint32Array.BYTES_PER_ELEMENT</code></a></dt>
<dd>返回一个number类型的值，表示元素的size。 <code>Uint32Array 返回4。</code></dd>
<dt>Uint32Array.length</dt>
<dd>长度属性，它的值是3。</dd>
<dt><a href="Reference/Global_Objects/TypedArray/name" title="TypedArray.name ?属性是描述类型数组构造名的字符串值。"><code>Uint32Array.name</code></a></dt>
<dd>返回字符串类型的值，表示构造器的名字。<code>Uint32Array</code> 的返回值是: "Uint32Array"。</dd>
<dt><a href="Reference/Global_Objects/TypedArray/prototype" title="TypedArray.prototype属性表示TypedArray构造器的原型."><code>Uint32Array.prototype</code></a></dt>
<dd>返回 <em>TypedArray</em> 对象的原型链。</dd>
</dl>
<h2 id="方法">方法</h2>
<dl>
<dt>Uint32Array.from()</dt>
<dd>参考<a href="Reference/Global_Objects/Array/from" title="Array.from() 方法从一个类似数组或可迭代对象中创建一个新的数组实例。"><code>Array.from()</code></a>。 未完成，请参考<a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=896608" rel="noopener" title="FIXED: Implement ES6 %TypedArray%.{of, from}">bug 896608</a>。</dd>
<dt>Uint32Array.of()</dt>
<dd>参考<a href="Reference/Global_Objects/Array/of" title="Array.of() 方法创建一个具有可变数量参数的新数组实例，而不考虑参数的数量或类型。"><code>Array.of()</code></a>。未完成，请参考 <a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=896608" rel="noopener" title="FIXED: Implement ES6 %TypedArray%.{of, from}">bug 896608</a>.</dd>
</dl>
<h2 id="Boolean_instances" name="Boolean_instances"><code>Uint32Array</code> prototype</h2>
<p><code><font face="Open Sans, sans-serif">所有</font>Uint32Array</code> 对象继承自 <a href="Reference/Global_Objects/TypedArray/prototype" title="TypedArray.prototype属性表示TypedArray构造器的原型."><code>%TypedArray%.prototype</code></a>.</p>
<h3 id="Properties">Properties</h3>
<dl>
<dt><code>Uint32Array.prototype.constructor</code></dt>
<dd>返回创建实例原型的函数。 默认返回 <code>Uint32Array</code> 的构造器。</dd>
<dt><a href="Reference/Global_Objects/TypedArray/buffer" title="buffer访问器属性表示由TypedArray在构造期间引用的ArrayBuffer。"><code>Uint32Array.prototype.buffer</code></a> <span class="inlineIndicator readOnly readOnlyInline" title="该属性的值无法更改">只读 </span></dt>
<dd>Returns the <a href="Reference/Global_Objects/ArrayBuffer" title="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 https://github.com/mdn/interactive-examples and send us a pull request."><code>ArrayBuffer</code></a> referenced by the <code>Uint32Array</code> Fixed at construction time and thus <strong>read only</strong>.</dd>
<dt><a href="Reference/Global_Objects/TypedArray/byteLength" title="byteLength访问器属性表示类型化数组的长度（字节数）。"><code>Uint32Array.prototype.byteLength</code></a> <span class="inlineIndicator readOnly readOnlyInline" title="该属性的值无法更改">只读 </span></dt>
<dd>Returns the length (in bytes) of the <code>Uint32Array</code> from the start of its <a href="Reference/Global_Objects/ArrayBuffer" title="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 https://github.com/mdn/interactive-examples and send us a pull request."><code>ArrayBuffer</code></a>. Fixed at construction time and thus <strong>read only.</strong></dd>
<dt><a href="Reference/Global_Objects/TypedArray/byteOffset" title="byteOffset 访问器属性表示类型化数组距离其ArrayBuffer起始位置的偏移（字节数）。"><code>Uint32Array.prototype.byteOffset</code></a> <span class="inlineIndicator readOnly readOnlyInline" title="该属性的值无法更改">只读 </span></dt>
<dd>Returns the offset (in bytes) of the <code>Uint32Array</code> from the start of its <a href="Reference/Global_Objects/ArrayBuffer" title="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 https://github.com/mdn/interactive-examples and send us a pull request."><code>ArrayBuffer</code></a>. Fixed at construction time and thus <strong>read only.</strong></dd>
<dt><a href="Reference/Global_Objects/TypedArray/length" title="length访问器属性表示类型化数组的长度（元素数）。"><code>Uint32Array.prototype.length</code></a> <span class="inlineIndicator readOnly readOnlyInline" title="该属性的值无法更改">只读 </span></dt>
<dd>Returns the number of elements hold in the <code>Uint32Array</code>. Fixed at construction time and thus <strong>read only.</strong></dd>
</dl>
<h3 id="Methods">Methods</h3>
<dl>
<dt><a href="Reference/Global_Objects/TypedArray/copyWithin" title="copyWithin()方法将数组中的元素序列复制到以target起始的位置。 副本取自第二个参数和第三个参数 start 和end的位置下标。end 参数是可选的，默认为数组长度。这个方法的算法和Array.prototype.copyWithin相同。 TypedArray 是这里的 类型化数组类型 之一。"><code>Uint32Array.prototype.copyWithin()</code></a></dt>
<dd>See <a href="Reference/Global_Objects/Array/copyWithin" title="改变了的数组。"><code>Array.prototype.copyWithin()</code></a>.</dd>
<dt><a href="Reference/Global_Objects/TypedArray/move" title="move()方法将数组中的元素序列复制到以target起始的位置。但是，这个非标准方法已经被TypedArray.prototype.copyWithin() 标准方法取代。TypedArray 是这里的 类型化数组类型 之一。"><code>Uint32Array.prototype.move()</code></a> <span class="icon-only-inline" title="This API has not been standardized."><i class="icon-warning-sign"> </i></span> <span class="inlineIndicator unimplemented unimplementedInline">未实现</span></dt>
<dd>Former non-standard version of <a href="Reference/Global_Objects/TypedArray/copyWithin" title="copyWithin()方法将数组中的元素序列复制到以target起始的位置。 副本取自第二个参数和第三个参数 start 和end的位置下标。end 参数是可选的，默认为数组长度。这个方法的算法和Array.prototype.copyWithin相同。 TypedArray 是这里的 类型化数组类型 之一。"><code>Uint32Array.prototype.copyWithin()</code></a>.</dd>
<dt><a href="Reference/Global_Objects/TypedArray/set" title="set() 方法用于从指定数组中读取值，并将其存储在类型化数组中。"><code>Uint32Array.prototype.set()</code></a></dt>
<dd>Stores multiple values in the <code>Uint32Array</code>, reading input values from a specified array.</dd>
<dt><a href="Reference/Global_Objects/TypedArray/subarray" title="此页面仍未被本地化, 期待您的翻译!"><code>Uint32Array.prototype.subarray()</code></a></dt>
<dd>Returns a new <code>Uint32Array</code> from the given start and end element index.</dd>
</dl>
<h2 id="Examples">Examples</h2>
<pre><code  class="language-javascript">// From a length
var uint32 = new Uint32Array(2);
uint32[0] = 42;
console.log(uint32[0]); // 42
console.log(uint32.length); // 2
console.log(uint32.BYTES_PER_ELEMENT); // 4

// From an array
var arr = new Uint32Array([21,31]);
console.log(arr[1]); // 31

// From another TypedArray
var x = new Uint32Array([21, 31]);
var y = new Uint32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
var buffer = new ArrayBuffer(16);
var z = Uint32Array(buffer, 0, 4);
</code></pre>
<h2 id="Specifications">Specifications</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><a class="external" href="https://www.khronos.org/registry/typedarray/specs/latest/#7" rel="noopener">Typed Array Specification</a></td>
<td>Obsolete</td>
<td><span><span>Superseded by ECMAScript 6.</span></span></td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#table-45" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">TypedArray constructors</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial definition in an ECMA standard.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div><p></p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>7.0</td>
<td><a href="/en-US/Firefox/Releases/4" title="Released on 2011-03-22.">4.0</a> (2)</td>
<td>10</td>
<td>11.6</td>
<td>5.1</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>4.0</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td>4.0 (2)</td>
<td>10</td>
<td>11.6</td>
<td>4.2</td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also">See also</h2>
<ul>
<li><a href="/en-US/docs/Web/JavaScript/Typed_arrays" title="en/JavaScript typed arrays">JavaScript typed arrays</a></li>
<li><a href="Reference/Global_Objects/ArrayBuffer" title="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 https://github.com/mdn/interactive-examples and send us a pull request."><code>ArrayBuffer</code></a></li>
<li><a href="Reference/Global_Objects/DataView" title="DataView 视图是一个可以从 ArrayBuffer 对象中读写多种数值类型的底层接口，在读写时不用考虑平台字节序问题。"><code>DataView</code></a></li>
</ul>
</article>