jquery - 如何删除 :hover on phones after is clicked

Question

我从 this codepen 实现了“滚动到顶部”箭头在我的网站上:

jQuery:

// ===== Scroll to Top ==== 
$(window).scroll(function() {
    if ($(this).scrollTop() >= 50) {        // If page is scrolled more than 50px
        $('#return-to-top').fadeIn(200);    // Fade in the arrow
    } else {
        $('#return-to-top').fadeOut(200);   // Else fade out the arrow
    }
});
$('#return-to-top').click(function() {      // When arrow is clicked
    $('body,html').animate({
        scrollTop : 0                       // Scroll to top of body
    }, 500);
});

CSS:

#return-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgb(0, 0, 0);
    background: rgba(0, 0, 0, 0.7);
    width: 50px;
    height: 50px;
    display: block;
    text-decoration: none;
    -webkit-border-radius: 35px;
    -moz-border-radius: 35px;
    border-radius: 35px;
    display: none;
    -webkit-transition: all 0.3s linear;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
#return-to-top i {
    color: #fff;
    margin: 0;
    position: relative;
    left: 16px;
    top: 13px;
    font-size: 19px;
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
#return-to-top:hover {
    background: rgba(0, 0, 0, 0.9);
}
#return-to-top:hover i {
    color: #fff;
    top: 5px;
}

它在桌面上运行良好，但在手机屏幕上有问题。单击箭头并且屏幕滚动到顶部时，如果我们再次向下滚动，箭头将显示为:悬停状态。

如何在点击后“取消设置”悬停？

编辑:

这是显示问题的截屏视频:https://streamable.com/5wr27

Answer 1

由于当鼠标离开元素时您所指的 :hover 状态会丢失，因此应用于该状态的所有样式也会丢失，从而将元素的样式恢复为原始样式。

此行为不会发生在移动设备屏幕上，因为您必须用某些东西按下它，而不是仅仅将鼠标悬停在它上面。在这种情况下，元素会保留按下它时应用的样式，而不是丢失它们(当鼠标离开元素时会发生这种情况)。

您所要做的就是手动将元素返回到之前的状态，可能是这样的:

// ===== Scroll to Top ==== 
$(window).scroll(function() {
  if ($(this).scrollTop() >= 50) { // If page is scrolled more than 50px
    $('#return-to-top').fadeIn(200); // Fade in the arrow
  } else {
    $('#return-to-top').fadeOut(200); // Else fade out the arrow
  }
});
$('#return-to-top').click(function() { // When arrow is clicked
  $('body,html').animate({
    scrollTop: 0 // Scroll to top of body
  }, 500);
});

#return-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgb(0, 0, 0);
  background: rgba(0, 0, 0, 0.7);
  width: 50px;
  height: 50px;
  display: block;
  text-decoration: none;
  -webkit-border-radius: 35px;
  -moz-border-radius: 35px;
  border-radius: 35px;
  display: none;
  -webkit-transition: all 0.3s linear;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

#return-to-top i {
  color: #fff;
  margin: 0;
  position: relative;
  left: 16px;
  top: 13px;
  font-size: 19px;
  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

#return-to-top:hover {
  background: rgba(0, 0, 0, 0.9);
}

#return-to-top:hover i {
  color: #fff;
  top: 5px;
}

#return-to-top:not(:focus),
#return-to-top:not(:active) {
  background: rgba(0, 0, 0, 0.7);
}

#return-to-top:not(:focus) i,
#return-to-top:not(:active) i {
  top: 13px
}


/* Extra Things */

body {
  background: #eee;
  font-family: 'Open Sans', sans-serif;
}

h3 {
  font-size: 30px;
  font-weight: 400;
  text-align: center;
  margin-top: 50px;
}

h3 i {
  color: #444;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Return to Top -->
<a href="javascript:" id="return-to-top"><i class="icon-chevron-up"></i></a>


<!-- ICON NEEDS FONT AWESOME FOR CHEVRON UP ICON -->
<link href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css" rel="stylesheet">


<!-- Test the scroll -->
<div style="height:2000px;">

  <h3>Scroll down</h3>
  <h3><i class="icon-arrow-down"></i>

</div>

您还可以查看 this answer仅将这些样式应用于移动设备。