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---
title: String.prototype.big()
slug: Web/JavaScript/Reference/Global_Objects/String/big
translation_of: Web/JavaScript/Reference/Global_Objects/String/big
---
<div>{{JSRef}} {{deprecated_header}}</div>

<p><strong><code>big()</code></strong>方法的作用是创建一个使字符串显示大号字体的{{HTMLElement("big")}}标签。</p>

<div class="note">
<p><strong>使用说明:</strong>  &lt;big&gt; 元素在<a href="/en-US/docs/Web/Guide/HTML/HTML5">HTML5</a>中已经被移除了,不应该再使用它。 取而代之的是web开发人员应该使用<a href="/en-US/docs/Web/CSS">CSS</a> 属性。</p>
</div>

<h2 id="语法">语法</h2>

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

<h3 id="返回值">返回值</h3>

<p>带有 {{HTMLElement("big")}}标签的字符串。</p>

<h2 id="描述">描述</h2>

<p><code>big()</code> 方法会将一个字符串嵌入到<code>&lt;big&gt;标签中:</code> <code>"&lt;big&gt;str&lt;/big&gt;"。</code></p>

<h2 id="示例">示例</h2>

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

<p>下面的例子使用了字符串方法来改变一个字符串的字体大小:</p>

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

console.log(worldString.small());     // &lt;small&gt;Hello, world&lt;/small&gt;
console.log(worldString.big());       // &lt;big&gt;Hello, world&lt;/big&gt;
console.log(worldString.fontsize(7)); // &lt;fontsize=7&gt;Hello, world&lt;/fontsize&gt;
</pre>

<p>使用 {{domxref("HTMLElement.style", "element.style")}} 对象,你能更加一般地获得和操作该元素的style属性,比如:</p>

<pre class="brush: js">document.getElementById('yourElemId').style.fontSize = '2em';
</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.big', 'String.prototype.big')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>初始定义。 在JavaScript 1.0中实现。在(规范性)附件B中定义了用于Web浏览器的附加ECMAScript 特性。</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-string.prototype.big', 'String.prototype.big')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td>在(规范性)附件B中定义了用于Web浏览器的附加ECMAScript 特性。</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="相关链接">相关链接</h2>

<ul>
 <li>{{jsxref("String.prototype.fontsize()")}}</li>
 <li>{{jsxref("String.prototype.small()")}}</li>
</ul>