javascript-如何找到文档的事件监听器？

Question

I am trying to find an event listener I have attached to the document, but when I console.log it i get an error. I have tried to get do getElementById and getElementsByClassName, but i couldn't see the Event listener I attached to it. Here is a test code

document.addEventListener('keydown', test,false);

function test(e) {
     console.log(document);
}

What i want to do is grab the event listener save it and re-added later on in another class. Something

var savedListener = document._listener; 
document.removeAllEventListener();

and maybe in another class for example

document._listener = savedListener ;

Answer 1

You can store the different parameters of your event in a variable and use it later:

 var evtToSave = { "event": 'keydown', "function": test, "useCapture": false }; document.addEventListener(evtToSave.event, evtToSave.function, evtToSave.useCapture); function test(e) { console.log(document); } //document.removeAllEventListener(); document.removeEventListener(evtToSave.event, evtToSave.function); document.addEventListener(evtToSave.event, evtToSave.function, evtToSave.useCapture);