jQuery常用事件方法mouseenter+mouseleave+hover

<div class="parent">
   <div class="box"></div>
</div>
 <script src="../jq/jquery-1.12.4.min.js"></script>
   <script>
     var $box = $(".box");
     var $parent = $(".parent");
     //对比mouseenter、mouseleave 和 mouseover、mouseout
     // 对比mouseenter、mouseleave 不冒泡
     $box.mouseenter(function(){
        console.log("box mouse in")
      })
     $box.mouseleave(function(){
        console.log("box mouse out")
     })
     $parent.mouseenter(function(){
        console.log("parent mouse in")
     })
     $parent.mouseleave(function(){
        console.log("parent mouse out")
     })

//mouseover、mouseout  冒泡
$box.mouseover(function(){
    console.log("box mouse in")
})
$box.mouseout(function(){
    console.log("box mouse out")
})
$parent.mouseover(function(){
    console.log("parent mouse in")
})
$parent.mouseout(function(){
    console.log("parent mouse out")
})

//hover() 对mouseenter和mouseleave合并书写
//$box.hover(function () { }, function () { })
$box.hover(function(){
    $box.addClass("big");
},function(){
   $box.removeClass("big")
})