我想删除使用addEventListener()添加的所有特定类型的事件侦听器。我所看到的所有资源都在告诉你需要这样做:
elem.addEventListener('mousedown',specific_function);
elem.removeEventListener('mousedown',specific_function);
但我希望能够在不知道它目前是什么情况下清除它,就像这样:
elem.addEventListener('mousedown',specific_function);
elem.removeEventListener('mousedown');
在不引用原始函数的情况下删除事件侦听器的现代方法是使用AbortController。需要注意的是,您只能中止您自己添加的侦听器。
const buttonOne = document.querySelector('#button-one');
const buttonTwo = document.querySelector('#button-two');
const abortController = new AbortController();
// Add multiple click event listeners to button one
buttonOne.addEventListener(
'click',
() => alert('First'),
{ signal: abortController.signal }
);
buttonOne.addEventListener(
'click',
() => alert('Second'),
{ signal: abortController.signal }
);
// Add listener to remove first button's listeners
buttonTwo.addEventListener(
'click',
() => abortController.abort()
);
<p>The first button will fire two alert dialogs when clicked. Click the second button to remove those listeners from the first button.</p>
<button type="button" id="button-one">Click for alerts</button>
<button type="button" id="button-two">Remove listeners</button>
在不引用原始函数的情况下删除事件侦听器的现代方法是使用AbortController。需要注意的是,您只能中止您自己添加的侦听器。
const buttonOne = document.querySelector('#button-one');
const buttonTwo = document.querySelector('#button-two');
const abortController = new AbortController();
// Add multiple click event listeners to button one
buttonOne.addEventListener(
'click',
() => alert('First'),
{ signal: abortController.signal }
);
buttonOne.addEventListener(
'click',
() => alert('Second'),
{ signal: abortController.signal }
);
// Add listener to remove first button's listeners
buttonTwo.addEventListener(
'click',
() => abortController.abort()
);
<p>The first button will fire two alert dialogs when clicked. Click the second button to remove those listeners from the first button.</p>
<button type="button" id="button-one">Click for alerts</button>
<button type="button" id="button-two">Remove listeners</button>