---
title: String.prototype.bold()
slug: Web/JavaScript/Reference/Global_Objects/String/bold
tags:
  - Deprecated
  - HTML wrapper methods
  - JavaScript
translation_of: Web/JavaScript/Reference/Global_Objects/String/bold
---
<p>{{JSRef}} {{deprecated_header}}</p>

<p id="概述"><strong><code>bold() </code></strong><code>方法会创建</code> HTML 元素 “b”，并将字符串加粗展示。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox"><code><var>str</var>.bold()</code></pre>

<h3 id="返回值"><strong>返回值</strong></h3>

<p>包含HTML元素 {{HTMLElement("b")}} 的字符串。</p>

<h2 id="描述">描述</h2>

<p><code>bold()</code> 方法将一个字符串嵌入到&lt;b&gt;&lt;/b&gt;标记中。</p>

<h2 id="示例">示例</h2>

<h3 id="使用bold()"><code><font face="Open Sans, Arial, sans-serif">使用</font>bold()</code></h3>

<p>下面的例子使用字符串方法来改变字符串的格式。</p>

<pre class="brush: js">var worldString = 'Hello, world';

console.log(worldString.blink());   // &lt;blink&gt;Hello, world&lt;/blink&gt;
console.log(worldString.bold());    // &lt;b&gt;Hello, world&lt;/b&gt;
console.log(worldString.italics()); // &lt;i&gt;Hello, world&lt;/i&gt;
console.log(worldString.strike());  // &lt;strike&gt;Hello, world&lt;/strike&gt;</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('ES6', '#sec-string.prototype.bold', 'String.prototype.bold')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>Initial definition. Implemented in JavaScript 1.0. Defined in the (normative) Annex B for Additional ECMAScript Features for Web Browsers.</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-string.prototype.bold', 'String.prototype.bold')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td>Defined in the (normative) Annex B for Additional ECMAScript Features for Web Browsers.</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>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop("1.0")}}</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>{{CompatGeckoMobile("1.0")}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="相关连接">相关连接</h2>

<ul>
 <li>{{jsxref("String.prototype.blink()")}}</li>
 <li>{{jsxref("String.prototype.italics()")}}</li>
 <li>{{jsxref("String.prototype.strike()")}}</li>
</ul>