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+---
+title: RegExp.prototype.unicode
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/unicode
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/unicode
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>unicode</code></strong> 属性表明正则表达式带有"<code>u</code>" 标志。 <code>unicode</code> 是正则表达式独立实例的只读属性。</p>
+
+<div>{{js_property_attributes(0, 0, 1)}}</div>
+
+<h2 id="描述">描述</h2>
+
+<p><code>unicode</code> 的值是 {{jsxref("Boolean")}},并且如果使用了 "<code>u</code>" 标志则为 <code>true</code>;否则为 <code>false</code>。"<code>u</code>" 标志开启了多种 Unicode 相关的特性。使用 "u" 标志,任何 Unicode 代码点的转义都会被解释。</p>
+
+<p>你不能直接修改这个属性,它是只读的。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_unicode_属性">使用 <code>unicode</code> 属性</h3>
+
+<pre class="brush: js">var regex = new RegExp('\u{61}', 'u');
+
+console.log(regex.unicode); // 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('ES2015', '#sec-get-regexp.prototype.unicode', 'RegExp.prototype.unicode')}}</td>
+ <td>{{Spec2('ES2015')}}</td>
+ <td>初始定义。</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-get-regexp.prototype.unicode', 'RegExp.prototype.unicode')}}</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>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Edge</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatChrome(50)}}</td>
+ <td>12 (case folding 13)</td>
+ <td>{{CompatGeckoDesktop(46)}}</td>
+ <td>{{CompatNo}}</td>
+ <td>37</td>
+ <td>10</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>{{CompatNo}}</td>
+ <td>{{CompatChrome(50)}}</td>
+ <td>{{CompatGeckoMobile(46)}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>10</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{jsxref("RegExp.lastIndex")}}</li>
+ <li>{{jsxref("RegExp.prototype.global")}}</li>
+ <li>{{jsxref("RegExp.prototype.ignoreCase")}}</li>
+ <li>{{jsxref("RegExp.prototype.multiline")}}</li>
+ <li>{{jsxref("RegExp.prototype.source")}}</li>
+ <li>{{jsxref("RegExp.prototype.sticky")}}</li>
+</ul>