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---
title: popstate
slug: Web/API/Window/popstate_event
tags:
- popstate
translation_of: Web/API/Window/popstate_event
---
<p>当活动历史记录条目更改时，将触发popstate事件。如果被激活的历史记录条目是通过对history.pushState（）的调用创建的，或者受到对history.replaceState（）的调用的影响，popstate事件的state属性包含历史条目的状态对象的副本。</p>
<p><font face="Courier New, Andale Mono, monospace"><span style="line-height: normal;">需要注意的是调用<code>history.pushState()</code>或</span></font><code>history.replaceState()</code>不会触发<code>popstate</code>事件。只有在做出浏览器动作时，才会触发该事件，如用户点击浏览器的回退按钮（或者在Javascript代码中调用<code>history.back()</code>或者<code>history.forward()</code>方法）</p>
<p><font face="Courier New, Andale Mono, monospace"><span style="line-height: normal;">不同的浏览器在加载页面时处理<code>popstate</code>事件的形式存在差异。页面加载时Chrome和Safari通常会触发(</span></font>emit <font face="Courier New, Andale Mono, monospace"><span style="line-height: normal;">)<code>popstate</code>事件，但Firefox则不会。</span></font></p>
<h2 id="常规信息">常规信息</h2>
<dl>
<dt style="float: left; text-align: right; width: 120px;">Specification</dt>
<dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html#event-popstate">HTML5</a></dd>
<dt style="float: left; text-align: right; width: 120px;">Interface</dt>
<dd style="margin: 0 0 0 120px;">PopStateEvent</dd>
<dt style="float: left; text-align: right; width: 120px;">Bubbles</dt>
<dd style="margin: 0 0 0 120px;">是</dd>
<dt style="float: left; text-align: right; width: 120px;">Cancelable</dt>
<dd style="margin: 0 0 0 120px;">否</dd>
<dt style="float: left; text-align: right; width: 120px;">Target</dt>
<dd style="margin: 0 0 0 120px;">defaultView</dd>
<dt style="float: left; text-align: right; width: 120px;">Default Action</dt>
<dd style="margin: 0 0 0 120px;">无</dd>
</dl>
<h2 id="属性">属性</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Property</th>
<th scope="col">Type</th>
<th scope="col">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>target</code> {{readonlyInline}}</td>
<td>{{domxref("EventTarget")}}</td>
<td>The browsing context (<code>window</code>).</td>
</tr>
<tr>
<td><code>type</code> {{readonlyInline}}</td>
<td>{{domxref("DOMString")}}</td>
<td>The type of event.</td>
</tr>
<tr>
<td><code>bubbles</code> {{readonlyInline}}</td>
<td>{{jsxref("Boolean")}}</td>
<td>Whether the event normally bubbles or not.</td>
</tr>
<tr>
<td><code>cancelable</code> {{readonlyInline}}</td>
<td>{{jsxref("Boolean")}}</td>
<td>Whether the event is cancellable or not.</td>
</tr>
<tr>
<td><code>state</code> {{readonlyInline}}</td>
<td><em>any</em></td>
<td>The current history entry's state object (if any).</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
{{Compat("api.Window.popstate_event")}}
<h2 id="示例">示例</h2>
<p> 打开<code>http://example.com/example.html页面运行以下代码，</code> 会按预期那样打出log提示。</p>
<pre><code>window.addEventListener('popstate', (event) => {
console.log("location: " + document.location + ", state: " + JSON.stringify(event.state));
});
history.pushState({page: 1}, "title 1", "?page=1");
history.pushState({page: 2}, "title 2", "?page=2");
history.replaceState({page: 3}, "title 3", "?page=3");
history.back(); // Logs "location: http://example.com/example.html?page=1, state: {"page":1}"
history.back(); // Logs "location: http://example.com/example.html, state: null
history.go(2); // Logs "location: http://example.com/example.html?page=3, state: {"page":3}</code></pre>
<p>使用<code>onpopstate</code>事件处理程序属性的相同示例：</p>
<pre><code>window.onpopstate = function(event) {
console.log("location: " + document.location + ", state: " + JSON.stringify(event.state));
};
history.pushState({page: 1}, "title 1", "?page=1");
history.pushState({page: 2}, "title 2", "?page=2");
history.replaceState({page: 3}, "title 3", "?page=3");
history.back(); // Logs "location: http://example.com/example.html?page=1, state: {"page":1}"
history.back(); // Logs "location: http://example.com/example.html, state: null
history.go(2); // Logs "location: http://example.com/example.html?page=3, state: {"page":3}</code></pre>
<p>注意，虽然原始的历史项（<span style="line-height: 1.5;"> </span><code style="font-size: 14px;">http://example.com/example.html所对应的</code><span style="line-height: 1.5;">）没有关联的状态对象（state object），但稍后调用<code>history.back()激活该历史项时，仍会触发popstate事件。</code></span></p>
<h2 id="相关事件">相关事件</h2>
<ul>
<li><a href="/en-US/docs/Mozilla_event_reference/hashchange"><code>hashchange</code></a></li>
</ul>
<h2 id="也可以看看">也可以看看</h2>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/History_API">Manipulating the browser history (the History API) </a></li>
</ul>
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