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+---
+title: Console.timeLog()
+slug: Web/API/Console/timeLog
+tags:
+  - API
+  - DOM
+  - Debugging
+  - Method
+  - Web Development
+  - console
+  - web console
+translation_of: Web/API/Console/timeLog
+---
+<div>{{APIRef("Console API")}}</div>
+
+<div>在控制台输出计时器的值，该计时器必须已经通过 {{domxref("console.time()")}} 启动。</div>
+
+<div></div>
+
+<p>参阅文档中的 <a href="/en-US/docs/Web/API/console#Timers">Timers</a> 部分获取详细说明和示例。 </p>
+
+<p>{{AvailableInWorkers}}</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">console.timeLog(<em>label</em>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>label</code></dt>
+ <dd>计时器索引。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>如果没有传入 label 参数，则以 default: 作为引导返回数据：</p>
+
+<pre>default: 1042ms</pre>
+
+<p>如果传入了一个已经存在的 <code>label</code> ，则会以 <code>label: </code> 作为引导返回数据：</p>
+
+<pre>label: 1242ms</pre>
+
+<h3 id="异常">异常</h3>
+
+<p>如果计时器未启动， <code>timeLog()</code> 会返回一个警告：</p>
+
+<pre><span class="message-body-wrapper"><span class="message-flex-body"><span class="devtools-monospace message-body">Timer “default” doesn’t exist.</span></span></span></pre>
+
+<p><span class="message-body-wrapper"><span class="message-flex-body"><span class="devtools-monospace message-body">如果传入的 label 索引没有与之对应的计时器，则返回如下警告：</span></span></span></p>
+
+<pre><span class="message-body-wrapper"><span class="message-flex-body"><span class="devtools-monospace message-body">Timer “timer name” doesn’t exist.</span></span></span> </pre>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">console.time("answer time");
+alert("Click to continue");
+console.timeLog("answer time");
+alert("Do a bunch of other stuff...");
+console.timeEnd("answer time");
+</pre>
+
+<p>上例中的输出分别显示了用户从打开页面到关闭第一个 alert 和第二个 alert 框的时间间隔：</p>
+
+<p><a href="https://mdn.mozillademos.org/files/16741/timer_output.png"><img alt="" src="https://mdn.mozillademos.org/files/16741/timer_output.png" style="height: 354px; width: 537px;"></a></p>
+
+<p>注意：使用 <code>timelog()</code> 输出计时器的值会显示计时器名称。使用 <code>timeEnd()</code> 停止也会显示计时器名称和输出计时器的值，并且，最后的 " - timer ended" 可以清楚的显示计时器不再计时的信息。</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("Console API", "#timelog", "console.timeLog()")}}</td>
+   <td>{{Spec2("Console API")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.Console.timeLog")}}</p>
+</div>
+
+<h2 id="相关文档">相关文档</h2>
+
+<ul>
+ <li><a href="http://www.opera.com/dragonfly/documentation/console/">Opera Dragonfly documentation: Console</a></li>
+</ul>