Javascript window.onpopstate 不工作；当我导航回页面时没有任何反应
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window.onpopstate is not working; nothing happens when I navigate back to page
提问by Erica Stockwell-Alpert
I'm trying to add window.onpopstateon one of the pages on my site, but nothing is happening. I put this script on the page:
我正在尝试添加window.onpopstate我网站上的其中一个页面，但没有任何反应。我把这个脚本放在页面上：
<script type="text/javascript">
window.addEventListener('popstate', function(event) {
if (event.state) {
alert(event.state);
}
}, false);
</script>
I have also tried:
我也试过：
<script type="text/javascript">
window.onpopstate = function() {
alert("popped!");
}
</script>
However, I don't get any alerts when I navigate back to the page.
但是，当我导航回页面时没有收到任何警报。
回答by Paolo
You get a popstateevent only if you add one or more history entry/entries and later the user clicks the backbutton in the browser.
popstate仅当您添加一个或多个历史条目/条目并且稍后用户单击浏览器中的后退按钮时，您才会收到事件。
Adding entries to the browser history lets you change the URL (just as the user navigates to another page) but without actually loading a new page.
将条目添加到浏览器历史记录可以让您更改 URL（就像用户导航到另一个页面一样），但无需实际加载新页面。
You add a history entry with pushStatemethod:
您使用pushState方法添加历史条目：
history.pushState({}, '', '/newpage');
As you add one entry and the user clicks backthe URL switches back to the previous one but the page at that address is not loaded. A popstateevent is triggered instead.
当您添加一个条目并且用户单击返回时，URL 会切换回前一个条目，但未加载该地址处的页面。popstate而是触发了一个事件。
See https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Manipulating_the_browser_history
请参阅https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Manipulating_the_browser_history
Exceptions:
例外：
Older browsers don't support popstateevents and manipulation of the browser's history.
较旧的浏览器不支持popstate浏览器历史记录的事件和操作。
Some browsers (ex. Safari) trigger a popstateevent also when the page is actually loaded.
某些浏览器（例如 Safari）popstate也会在实际加载页面时触发事件。
