JavaScript：窗口事件侦听器不起作用

Question

I add the following event listener to the window object:

window.addEventListener( 'popstate beforeunload', () => {
    console.log('test');
});

I'd expect that a console log entry is being created whenever I navigate the browsers history or reload the page. However, nothing happens. What am I doing wrong?

Answer 1

If you want two event listeners, you need to add them separately.

var handler = () => {
  console.log('test');
};
window.addEventListener('popstate', handler);
window.addEventListener('beforeunload', handler);

Some libraries like jQuery's .on will automatically split on whitespace to allow this kind of thing, but .addEventListener itself does not.