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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: String.prototype.toUpperCase()
+slug: Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+tags:
+ - JavaScript
+ - 原型
+ - 字符串
+ - 引用
+ - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>toUpperCase()</code></strong> 方法将调用该方法的字符串转为大写形式并返回(如果调用该方法的值不是字符串类型会被强制转换)。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/string-touppercase.html","shorter")}}</div>
+
+<p class="hidden">这个交互式示例的源代码存储在GitHub存储库中。如果您想对交互式示例项目作出贡献,请克隆<a href="/zh-CN/docs/">https://github.com/mdn/interactive-examples</a>并向我们发送请求。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><var>str</var>.toUpperCase()</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的字符串,表示转换为大写的调用字符串。</p>
+
+<h3 id="错误处理">错误处理</h3>
+
+<dl>
+ <dt>{{jsxref("TypeError(类型错误)")}}</dt>
+ <dd>在 {{jsxref("null")}} 或 {{jsxref("undefined")}}类型上调用,例如:<code>String.prototype.toUpperCase.call(undefined)</code>.</dd>
+</dl>
+
+<h2 id="描述">描述</h2>
+
+<p><code>toUpperCase()</code> 返回转为大写形式的字符串。此方法不会影响原字符串本身的值,因为JavaScript中字符串的值是不可改变的。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="基本用法">基本用法</h3>
+
+<pre class="brush: js notranslate">console.log('alphabet'.toUpperCase()); // 'ALPHABET'
+</pre>
+
+<h3 id="将非字符串类型的_this_(上下文)转为字符串">将非字符串类型的 <code>this</code> (上下文)转为字符串</h3>
+
+<p>此方法会将任何非字符串类型的值转为字符串, 当你将其上下文 <code>this</code> 值设置为非字符串类型</p>
+
+<pre class="brush: js notranslate">const a = String.prototype.toUpperCase.call({
+ toString: function toString() {
+ return 'abcdef';
+ }
+});
+
+const b = String.prototype.toUpperCase.call(true);
+
+// 输出 'ABCDEF TRUE'。
+console.log(a, b);
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">规范</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-string.prototype.touppercase', 'String.prototype.toUpperCase')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">此页中的兼容性表是从结构化数据生成的。如果你想对数据有所贡献,请查看<a href="/zh-CN/docs/">https://github.com/mdn/browser-compat-data</a>并向我们发送请求。</div>
+
+<p>{{Compat("javascript.builtins.String.toUpperCase")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.toLocaleLowerCase()")}}</li>
+ <li>{{jsxref("String.prototype.toLocaleUpperCase()")}}</li>
+ <li>{{jsxref("String.prototype.toLowerCase()")}}</li>
+</ul>