怎么移除css的hover事件

$(document).ready(function(){ $('a').on({ hover: function(e) {
 //Hover event handler
alert("hover"); },
click: function(e) { // Click event handler
alert("click"); } });
});

$("a").hover(function(){ alert('mouseover'); }, function(){
alert('mouseout'); })

$(document).ready(function(){ $('a').on({ mouseenter: function(e) {
//Hover event handler
alert("mouseover"); }, mouseleave: function(e) {
//Hover event handler
alert("mouseout"); }, click: function(e) {
// Clickevent handler
alert("click"); } });
});

$("a").hover(function(){ alert('mouseover'); }, function(){
alert('mouseout'); })

$('a').off('mouseenter').unbind('mouseleave');