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+---
+title: String.prototype.trim()
+slug: Web/JavaScript/Reference/Global_Objects/String/Trim
+tags:
+  - ECMAScript 5
+  - JavaScript
+  - Method
+  - Prototype
+  - String
+  - 参考
+  - 字符串
+  - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/String/Trim
+---
+<div>
+<div>
+<div>{{JSRef}}</div>
+</div>
+</div>
+
+<p><strong><code>trim()</code> </strong>方法会从一个字符串的两端删除空白字符。在这个上下文中的空白字符是所有的空白字符 (space, tab, no-break space 等) 以及所有行终止符字符（如 LF，CR等）。</p>
+
+<p>{{EmbedInteractiveExample("pages/js/string-trim.html")}}</p>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><code><var>str</var>.trim()</code></pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个代表调用字符串两端去掉空白的新字符串。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>trim()</code> 方法返回一个从两头去掉空白字符的字符串，并不影响原字符串本身。</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="使用_trim">使用 <code>trim()</code></h3>
+
+<p>下面的例子中将显示小写的字符串 'foo':</p>
+
+<pre class="brush: js notranslate">var orig = '   foo  ';
+console.log(orig.trim()); // 'foo'
+
+// 另一个 .trim() 例子，只从一边删除
+
+var orig = 'foo    ';
+console.log(orig.trim()); // 'foo'
+</pre>
+
+<h2 id="兼容旧环境">兼容旧环境</h2>
+
+<p>如果 <code>trim()</code> 不存在，可以在所有代码前执行下面代码</p>
+
+<pre class="brush: js notranslate">if (!String.prototype.trim) {
+  String.prototype.trim = function () {
+    return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
+  };
+}
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.5.4.20', 'String.prototype.trim')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.8.1.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-string.prototype.trim', 'String.prototype.trim')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.trim', 'String.prototype.trim')}}</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>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.String.trim")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.trimStart()")}}</li>
+ <li>{{jsxref("String.prototype.trimEnd()")}}</li>
+</ul>