Javascript: Programmatically trigger onbeforeunload/onunload event

问题

How can I programmatically trigger onbeforeunload and onunload events?(No jquery please). I've tried:

var event = new Event('onbeforeunload');
event.initEvent("onbeforeunload", true, true);
window.document.dispatchEvent(event);

回答1:

Either use

object.onunload=function(){myScript};

or the addEventListener() method:

object.addEventListener("unload", myScript);

to trigger the event use object.unload();

回答2:

window.dispatchEvent(new Event('beforeunload'))

I think this would be the best way now. In case anyone finds this.

window.addEventListener('beforeunload',()=>{console.log("beforeunload triggered")})
window.dispatchEvent(new Event('beforeunload'))

来源：https://stackoverflow.com/questions/31495381/javascript-programmatically-trigger-onbeforeunload-onunload-event