摘要：
mouseenter/mouseleave 和 mouseover/mouseout的本质区别网上讲得比较多，但各种解释看得云里雾里，经过试验，他们的区别 it differs in that it doesn't bubble and that it isn't sent when the pointer is moved from one of its descendants' physical space to its own physical space 引自mozilla.org上面这句英文用不同的颜色区分以断句，方便理解。本质还是体现在冒泡上。可以通过下面两 阅读全文