1、
mouseover:会在鼠标进入该元素或者该元素的子元素时触发
mouseenter:只在鼠标进入该元素时触发
mouseout:在鼠标移出该元素或则该元素的子元素时触发
mouseleave:只在鼠标离开该元素时触发
所以在整个过程中,mouseenter mouseleave只触发一次。over和out触发多次(每次进入和退出子元素都会触发)
var odiv = document.getElementById('outer');
odiv.addEventListener('mouseenter',enterHandler,false);
odiv.addEventListener('mouseover',overHandler,false);
odiv.addEventListener('mouseout',outHandler,false);
odiv.addEventListener('mouseleave',leaveHandler,false); function enterHandler(){
console.log('触发enter事件');
}
function overHandler(){
console.log('触发over事件');
}
function outHandler(){
console.log('触发out事件');
}
function leaveHandler(){
console.log('触发leave事件');
}