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+---
+title: do...while
+slug: Web/JavaScript/Reference/Statements/do...while
+tags:
+  - JavaScript
+  - Statement
+translation_of: Web/JavaScript/Reference/Statements/do...while
+---
+<div>
+<div>{{jsSidebar("Statements")}}</div>
+</div>
+
+<p><strong><code>do...while</code> 语句</strong><span lang="zh-CN"><span>创建一个执行指定语句的循环，直到</span></span><code>condition</code><span lang="zh-CN"><span>值为 false。</span><span>在执行</span></span><code>statement</code> <span lang="zh-CN"><span>后检测</span></span><code>condition</code><span lang="zh-CN"><span>，所以指定的</span></span><code>statement</code><span lang="zh-CN"><span>至少执行一次。</span></span></p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox">do
+   <em>statement</em>
+while (<em>condition</em>);
+</pre>
+
+<dl>
+ <dt><code>statement</code></dt>
+ <dd><span class="short_text" id="result_box" lang="zh-CN"><span>执行至少一次的语句，并在每次 </span></span><code>condition</code> <span class="short_text" lang="zh-CN"><span>值为真时重新执行。</span></span>想执行多行语句，可使用<span style="line-height: 19.0909080505371px;">{{jsxref("Statements/block", "block")}}</span>语句<span style="line-height: 19.0909080505371px;">（</span><code style="font-style: normal; line-height: 19.0909080505371px;">{ ... }</code><span style="line-height: 19.0909080505371px;">）</span>包裹这些语句。</dd>
+</dl>
+
+<dl>
+ <dt><code>condition</code></dt>
+ <dd>循环中每次都会计算的表达式。如果 <code>condition</code> 值为真， <code>statement</code> 会再次执行。当 <code>condition</code> <span style="line-height: 19.0909080505371px;">值为假</span>，则跳到<code>do...while</code>之后的语句。</dd>
+</dl>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="Example:_Using_do...while" name="Example:_Using_do...while">使用 <code>do...while</code></h3>
+
+<p>下面的例子中，<code>do...while</code> 循环至少迭代一次，并且继续迭代直到 <code>i</code>不再小于 5 时结束。</p>
+
+<h3 id="HTML_内容">HTML 内容</h3>
+
+<pre class="brush: html line-numbers  language-html"><code class="language-html"><span class="tag token"><span class="tag token"><span class="punctuation token">&lt;</span>div</span> <span class="attr-name token">id</span><span class="attr-value token"><span class="punctuation token">=</span><span class="punctuation token">"</span>example<span class="punctuation token">"</span></span><span class="punctuation token">&gt;</span></span><span class="tag token"><span class="tag token"><span class="punctuation token">&lt;/</span>div</span><span class="punctuation token">&gt;</span></span></code></pre>
+
+<h3 id="JavaScript_内容">JavaScript 内容</h3>
+
+<pre class="brush: js"><code class="language-js"><span class="keyword token">var</span> result <span class="operator token">=</span> <span class="string token">''</span><span class="punctuation token">;</span>
+<span class="keyword token">var</span> i <span class="operator token">=</span> <span class="number token">0</span><span class="punctuation token">;</span>
+<span class="keyword token">do</span> <span class="punctuation token">{</span>
+   i <span class="operator token">+</span><span class="operator token">=</span> <span class="number token">1</span><span class="punctuation token">;</span>
+   result <span class="operator token">+</span><span class="operator token">=</span> i <span class="operator token">+</span> <span class="string token">' '</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span> <span class="keyword token">while</span> <span class="punctuation token">(</span>i <span class="operator token">&lt;</span> <span class="number token">5</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+document<span class="punctuation token">.</span><span class="function token">getElementById</span><span class="punctuation token">(</span><span class="string token">'example'</span><span class="punctuation token">)</span><span class="punctuation token">.</span>innerHTML <span class="operator token">=</span> result<span class="punctuation token">;</span></code></pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{ EmbedLiveSample('Examples') }}</p>
+
+<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('ES3')}}</td>
+   <td>{{Spec2('ES3')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.2</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-12.6.1', 'do-while statement')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-do-while-statement', 'do-while statement')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Trailing ; is now optional.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-do-while-statement', 'do-while statement')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+
+
+<p>{{Compat("javascript.statements.do_while")}}</p>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Statements/while", "while")}}</li>
+ <li>{{jsxref("Statements/for", "for")}}</li>
+</ul>