JavaScript IE、chrome 事件监听#

1addEventListener('click', fn, false)

1attachEvent('onclick', fn)

1removeEventListener(oEvent, fn) // chrome
2detachEvent(oEvent, fn) // IE

1el.addEventListener ? el.addEventListener(event, fn, false) : el.attachEvent(`on${event}`, fn)
2el.removeEventListener ? el.removeEventListener(event, fn) : el.detachEvent(`on${event}`, fn)