uTools-Manuals/docs/javascript/Reference/Global_Objects/String/fromCharCode.html

<article id="wikiArticle">
<p></p><p></p>
<p>静态 <strong><code>String.fromCharCode()</code></strong> 方法返回由指定的UTF-16代码单元序列创建的字符串。</p>
<div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/string-fromcharcode.html" width="100%"></iframe></div>
<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>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre><code class="language-javascript"><code>String.fromCharCode(<em>num1</em>, <em>...</em>, <em>numN</em>) </code></code></pre>
<h3 id="Parameters" name="Parameters">参数</h3>
<dl>
<dt><code>num1, ..., num<em>N</em></code></dt>
<dd>一系列UTF-16代码单元的数字。 范围介于0到65535（0xFFFF）之间。 大于0xFFFF的数字将被截断。 不进行有效性检查。</dd>
</dl>
<h3 id="返回值">返回值</h3>
<p>一个长度为N的字符串，由N个指定的UTF-16代码单元组成.</p>
<h2 id="Description" name="Description">描述</h2>
<p>该方法返回一个字符串，而不是一个  <a href="Reference/String" title="此页面仍未被本地化, 期待您的翻译!"><code>String</code></a> 对象。</p>
<p>由于 <code>fromCharCode()</code> 是  <a href="Reference/String" title="此页面仍未被本地化, 期待您的翻译!"><code>String</code></a> 的静态方法，所以应该像这样使用：<code>String.fromCharCode()</code>，而不是作为你创建的  <a href="Reference/String" title="此页面仍未被本地化, 期待您的翻译!"><code>String</code></a> 对象的方法。</p>
<h2 id="Examples" name="Examples">示例</h2>
<h3 id="Example:_Using_fromCharCode" name="Example:_Using_fromCharCode">例子：使用 <code>fromCharCode</code></h3>
<pre><code class="language-js">String.fromCharCode(65, 66, 67);  // returns "ABC"
String.fromCharCode(0x2014)       // returns "—"
String.fromCharCode(0x12014)      // also returns "—"; the digit 1 is truncated and ignored
</code></pre>
<p> </p>
<h2 id="Getting_it_to_work_with_higher_values" name="Getting_it_to_work_with_higher_values">作用于高位编码（higher values）</h2>
<p>尽管绝大部分常用的 Unicode 值可以用一个 16-bit 数字表示（正如JavaScript标准化早期所预期的那样），而<code>fromCharCode()</code>可用于返回最常见值的单个字符（即UCS-2值，即 UTF-16的子集具有最常见的字符），但是为了处理所有的 Unicode 值（最多 21位），只用 <code>fromCharCode()</code> 是不够的。  由于高位编码字符是用两个低位编码（lower value）表示形成的一个字符，因此可以使用<a href="Reference/Global_Objects/String/fromCodePoint" title="String.fromCodePoint() 静态方法返回使用指定的代码点序列创建的字符串。"><code>String.fromCodePoint()</code></a> （ES2015标准的一部分）返回这样一对低位编码，从而可以完全表示这些高位编码字符。</p>
<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>ECMAScript 1st Edition.</td>
<td>Standard</td>
<td>Initial definition.<br/>
    Implemented in JavaScript 1.2</td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/5.1/#sec-15.5.3.2" hreflang="en" lang="en" rel="noopener">ECMAScript 5.1 (ECMA-262)<br/><small lang="zh-CN">StringfromCharCode</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-string.fromcharcodes" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">String.fromCharCode</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</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><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></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><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also" name="See_also">相关链接</h2>
<ul>
<li><a href="Reference/Global_Objects/String/charCodeAt" title="charCodeAt() 方法返回0到65535之间的整数，表示给定索引处的UTF-16代码单元 (在 Unicode 编码单元表示一个单一的 UTF-16 编码单元的情况下，UTF-16 编码单元匹配 Unicode 编码单元。但在——例如 Unicode 编码单元 &gt; 0x10000 的这种——不能被一个 UTF-16 编码单元单独表示的情况下，只能匹配 Unicode 代理对的第一个编码单元) 。如果你想要整个代码点的值，使用 codePointAt()。"><code>String.prototype.charCodeAt()</code></a></li>
<li><a href="Reference/Global_Objects/String/charAt" title="charAt() 方法从一个字符串中返回指定的字符。"><code>String.prototype.charAt()</code></a></li>
<li><a href="Reference/Global_Objects/String/fromCodePoint" title="String.fromCodePoint() 静态方法返回使用指定的代码点序列创建的字符串。"><code>String.fromCodePoint()</code></a></li>
<li><a href="Reference/Global_Objects/String/codePointAt" title="codePointAt() 方法返回 一个 Unicode 编码点值的非负整数。"><code>String.prototype.codePointAt()</code></a></li>
</ul>
</article>