问题
I'm wondering if it is possible to view
1. How many event listeners
2. What type of event listener
On a single web page.
Reason being is becuase im using off(); method.
I'm using this framework, which is basically jQuery but not.
Yeah, I'm using off but the even't isn't removing and and I have a feeling there is more than one eventListener on the element.
If it is not possible with javascript, it is possible in the browser?
回答1:
Chrome has some built in tools. If you open up the element inspector, focus on an element, scroll to the bottom of the right hand column (where the CSS/Metrics/etc are), you should see a drop down section that says Event Listeners. This can help some...
Often I find it easier to just add event listeners to some DOM element via the console and seeing if it responds. Or I throw in debuggers in various places (before setting up the listener, and inside the listener's callback). The problems I usually run into is the selector I think exists doesn't or the event gets bound too early and misses the selector.
回答2:
A long time passes...
I have found something new in Chrome DevTools.
Simple as this in the console
getEventListeners(yourElement);
Documentation: https://developers.google.com/chrome-developer-tools
回答3:
You can use the Visual Event bookmarklet: http://www.sprymedia.co.uk/article/Visual+Event+2
来源：https://stackoverflow.com/questions/17795211/view-event-listeners-javascript