js常见兼容

1，滚动条

document.documentElement.scrollTop || document.body.scrollTop

2.事件对象兼容

event || window.event

3.阻止事件冒泡

event.stopPropagation || event.cancleBubble

4.阻止默认行为

event.preventDefautl || event.returnValue

5.事件目标对象兼容

event || event.srcElement

6.事件监听兼容

attactEvent || addEventListener