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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
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+---
+title: RegExp.prototype.multiline
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/multiline
+tags:
+ - JavaScript
+ - Property
+ - Prototype
+ - RegExp
+ - Regular Expressions
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/multiline
+---
+<div>
+ {{JSRef("Global_Objects", "RegExp")}}</div>
+<h2 id="Summary" name="Summary">概述</h2>
+<p><code><strong>multiline</strong></code> 属性表明正则表达式是否使用了 "<code>m</code>" 标志。<code>multiline</code> 是正则表达式实例的一个只读属性。</p>
+<div>
+ {{js_property_attributes(0,0,0)}}</div>
+<h2 id="Description" name="Description">描述</h2>
+<p><code>multiline</code> 是一个布尔对象,如果使用了 "<code>m</code>" 标志,则返回 <code>true</code>;否则,返回 <code>false</code>。"<code>m</code>" 标志意味着一个多行输入字符串被看作多行。例如,使用 "<code>m</code>","<code>^</code>" 和 "<code>$</code>" 将会从只匹配正则字符串的开头或结尾,变为匹配字符串中任一行的开头或结尾。</p>
+<p>你无法直接更改此属性。</p>
+<h2 id="Examples" name="Examples">示例</h2>
+<h3 id="Example:_Using_MIN_VALUE" name="Example:_Using_MIN_VALUE">例子:使用 <code>multiline</code></h3>
+<pre class="brush:js">var regex = new RegExp("foo", "m")
+
+console.log(regex.multiline) // 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>ECMAScript 3rd Edition. Implemented in JavaScript 1.2.</td>
+ <td>Standard</td>
+ <td>Initial definition.<br>
+ JavaScript 1.5: <code>multiline</code> is a property of a <code>RegExp</code> instance, not the <code>RegExp</code> object.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.10.7.4', 'RegExp.prototype.multiline')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-get-regexp.prototype.multiline', 'RegExp.prototype.multiline')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td><code>multiline</code> is now a prototype accessor property rather than an instance's own data property.</td>
+ </tr>
+ </tbody>
+</table>
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+<p>{{ CompatibilityTable() }}</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>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</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>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ </tr>
+ </tbody>
+ </table>
+</div>
+<h2 id="See_also" name="See_also">相关链接</h2>
+<ul>
+ <li>{{jsxref("RegExp.prototype.global")}}</li>
+ <li>{{jsxref("RegExp.prototype.lastIndex")}}</li>
+ <li>{{jsxref("RegExp.prototype.ignoreCase")}}</li>
+ <li>{{jsxref("RegExp.prototype.source")}}</li>
+ <li>{{jsxref("RegExp.prototype.sticky")}}</li>
+</ul>