代码示例:(标识:event_onpageshow_persisted)
<!DOCTYPE html>
<html>
<body onpageshow="myFunction(event)">

<h1>Hello World!</h1>

<p><b>注释:</b>Internet Explorer 10 及更早版本不支持 onpageshow 事件。</p>

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

</body>
</html>
运行结果: