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If you want to use a method that only executes once, just use .one(). However, in general, jQuery animation special effects must consider the animation queue. It is recommended to add .stop() before executing the animation. Method to stop animations that "enter the animation queue but are not completely executed"

$(".target").on('mouseenter',function() {
    $(this).children('.p1').show(function(){
        $(this).addClass('animated fadeInLeft');
        $(this).removeClass('animated fadeInLeft');
    })
});
$(".target").on('mouseleave',function() {
    $(this).children('.p1').hide(function(){
        $(this).addClass('animated fadeOutLeft');
        $(this).removeClass('animated fadeOutLeft');
    })
    $(this).unbind();    //加一句這個(gè)取消當(dāng)前dom的所有綁定事件
});

Add an e after

on, and you can use .one()This API will automatically delete it once.

Reference

If you want to stop the animation immediately, use stop()

$(this).children('.p1').stop(true, true)

$(".target").off('mouseenter').on('mouseenter',function() {

$(this).children('.p1').show(function(){
    $(this).addClass('animated fadeInLeft');
    $(this).removeClass('animated fadeInLeft');
})

});
$(".target").off('mouseenter').on('mouseleave',function() {

$(this).children('.p1').hide(function(){
    $(this).addClass('animated fadeOutLeft');
    $(this).removeClass('animated fadeOutLeft');
})

});