没区别
mouseover的方法如下
jQuery.each( {
mouseenter: "mouseover",
mouseleave: "mouseout",
pointerenter: "pointerover",
pointerleave: "pointerout"
}, function( orig, fix ) {
jQuery.event.special[ orig ] = {
delegateType: fix,
bindType: fix,
handle: function( event ) {
var ret,
target = this,
related = event.relatedTarget,
handleObj = event.handleObj;
if ( !related || ( related !== target && !jQuery.contains( target, related ) ) ) {
event.type = handleObj.origType;
ret = handleObj.handler.apply( this, arguments );
event.type = fix;
}
return ret;
}
};
} );
可以看出来就是一个方法,hover则是mouseenter mouseleave方法组合成的