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+---
+title: String.length
+slug: Web/JavaScript/Reference/Global_Objects/String/length
+tags:
+  - JavaScript
+  - Property
+  - Prototype
+  - String
+translation_of: Web/JavaScript/Reference/Global_Objects/String/length
+---
+<p>{{JSRef("Global_Objects", "String")}}</p>
+
+<h2 id="Summary" name="Summary" style="margin-bottom: 20px; line-height: 30px;">概述</h2>
+
+<p><strong>length</strong> 属性表示一个字符串的长度。</p>
+
+<h2 id="Description" name="Description" style="margin-bottom: 20px; line-height: 30px;">描述</h2>
+
+<p>该属性返回字符串中字符编码单元的数量。JavaScript 使用 {{ interwiki("wikipedia", "UTF-16") }} 编码，该编码使用一个 16 比特的编码单元来表示大部分常见的字符，使用两个代码单元表示不常用的字符。因此 length 返回值可能与字符串中实际的字符数量不相同。</p>
+
+<p>空字符串的 <code>length</code> 为 0。</p>
+
+<p>静态属性 <strong>String.length</strong> 返回 1。</p>
+
+<h2 id="Examples" name="Examples" style="margin-bottom: 20px; line-height: 30px;">示例</h2>
+
+<pre class="brush: js">var x = "Mozilla";
+var empty = "";
+
+console.log("Mozilla is " + x.length + " code units long");
+/* "Mozilla is 7 code units long" */
+
+console.log("The empty string is has a length of " + empty.length);
+/* "The empty string is has a length of 0" */</pre>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 0px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 19px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 38px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 57px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 76px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 95px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 114px; background: 0px 0px;"> </div>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 133px; background: 0px 0px;"> </div>
+
+<h2 id="规范" style="margin-bottom: 20px; line-height: 30px;">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('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.5.5.1', 'String.prototype.length')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-properties-of-string-instances-length', 'String.prototype.length')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性" style="margin-bottom: 20px; line-height: 30px;">浏览器兼容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th style="line-height: 16px;">Feature</th>
+   <th style="line-height: 16px;">Chrome</th>
+   <th style="line-height: 16px;">Firefox (Gecko)</th>
+   <th style="line-height: 16px;">Internet Explorer</th>
+   <th style="line-height: 16px;">Opera</th>
+   <th style="line-height: 16px;">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 style="line-height: 16px;">Feature</th>
+   <th style="line-height: 16px;">Android</th>
+   <th style="line-height: 16px;">Chrome for Android</th>
+   <th style="line-height: 16px;">Firefox Mobile (Gecko)</th>
+   <th style="line-height: 16px;">IE Mobile</th>
+   <th style="line-height: 16px;">Opera Mobile</th>
+   <th style="line-height: 16px;">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" style="margin-bottom: 20px; line-height: 30px;">相关链接</h2>
+
+<ul>
+ <li><a class="external external-icon" href="http://developer.teradata.com/blog/jasonstrimpel/2011/11/javascript-string-length-and-internationalizing-web-applications" style="white-space: pre-line;">JavaScript String.length and Internationalizing Web Applications</a></li>
+</ul>