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---
title: History.length
slug: Web/API/History/length
translation_of: Web/API/History/length
---
<div>{{ APIRef("HTML DOM") }}</div>
<p>History.length是一个只读属性，返回当前session中的history个数，包含当前页面在内。举个例子，对于新开一个tab加载的页面当前属性返回值1。</p>
<p> </p>
<h2 id="语法">语法</h2>
<p> </p>
<pre class="syntaxbox"><em>length</em> = <em>history</em>.length;
</pre>
<h2 id="例子">例子</h2>
<pre class="brush: js">var result = window.history.length; // 返回当前session中的history个数</pre>
<h2 id="说明">说明</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">说明</th>
<th scope="col">状态</th>
<th scope="col">注释</th>
</tr>
<tr>
<td>{{SpecName('HTML WHATWG', "history.html#dom-history-length", "History.length")}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td>No change from {{SpecName("HTML5 W3C")}}.</td>
</tr>
<tr>
<td>{{SpecName('HTML5 W3C', "browsers.html#dom-history-length", "History.length")}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("api.History.length")}}</p>
<h2 id="参考">参考</h2>
<ul>
<li>The {{domxref("History")}} interface it belongs to.</li>
</ul>
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