--- title: PageTransitionEvent slug: Web/API/PageTransitionEvent translation_of: Web/API/PageTransitionEvent ---

{{APIRef("HTML DOM")}}

Page transition events fire when a webpage is being loaded or unloaded.

当网页在加载完成或卸载后会触发页面传输事件（Page transition events）。

DOM Information

 

Inheritance Hierarchy

 Event
   PageTransitionEvent

Example

HTML

<!DOCTYPE html>
<html>
<body onpageshow="myFunction(event)">
</body>
</html>

JavaScript

function myFunction(event) {
    if (event.persisted) {
        alert("The page was cached by the browser");
    } else {
        alert("The page was NOT cached by the browser");
    }
}

Members

The PageTransitionEvent object has these types of members:

Properties

The PageTransitionEvent object has these properties.

Property Access type Description

persisted

 只读

标记页面是否从缓存（Backforward Cache）中加载