react js : detect page refresh

问题

I am new to react.js. I have a simple page with table. When I reload the page, state is getting lost. Is there a way to detect the browser refresh ?

回答1:

Try this one. This worked for me.

if (window.performance) {
  if (performance.navigation.type == 1) {
    alert( "This page is reloaded" );
  } else {
    alert( "This page is not reloaded");
  }
}

回答2:

The event beforeunload is executed just before window browser is being refreshed. Event is cancellable.

window.beforeunload = (e) => {
  console.log('Stop this');
  e.preventDefault()
  e.returnValue = '';
};

When using React an option is to take control in your Application component, or your most higher order component, in the componentDidMount lifecycle method as @georgim suggested instead componentWillUnmount as I first suggested, and manage there what you want to achieve.

来源：https://stackoverflow.com/questions/47368578/react-js-detect-page-refresh