Javascript 逐个淡入jQuery中的元素_Javascript_Jquery_Html_Css_Fadein

Javascript 逐个淡入jQuery中的元素

javascript jquery html css

Javascript 逐个淡入jQuery中的元素,javascript,jquery,html,css,fadein,Javascript,Jquery,Html,Css,Fadein,当你向下滚动时，我试图一个接一个地获得渐弱元素的效果。我在网上找到了一个很好的教程，并浏览了一遍，最后得到了以下jQuery： $(document).on("scroll", function () { var pageTop = $(document).scrollTop() var pageBottom = pageTop + $(window).height() var tags = $(".fadeIn") for (var i = 0; i < tag

当你向下滚动时，我试图一个接一个地获得渐弱元素的效果。我在网上找到了一个很好的教程，并浏览了一遍，最后得到了以下jQuery：

  $(document).on("scroll", function () {
  var pageTop = $(document).scrollTop()
  var pageBottom = pageTop + $(window).height()
  var tags = $(".fadeIn")

    for (var i = 0; i < tags.length; i++) {
    var tag = tags[i]

    if ($(tag).position().top < pageBottom) {
      $(tag).addClass("visible")
    } else {
      $(tag).removeClass("visible")
    }
  }
})

淡入和向上过渡非常有效，只是它可以同时作用于这个类的所有元素。我认为使用循环，它将分别作用于每个元素，以便在向下滚动时一个接一个地显示。不确定这里出了什么问题

按顺序执行的最佳方法是使用承诺。示例：或者，您可以嵌套fade（）函数，在另一个函数完成时调用一个函数，尽管这很麻烦。谢谢。但我仍然不确定为什么我的解决方案不起作用。当然，循环应该一次使用.fadeIn查看每个元素并执行该函数。如果该元素在窗口中不可见，那么它肯定不会执行fadeIn？请参阅您使用的是jQuery 1.3-如果您能够更改它，则从1.4开始有一个delay（）方法。您可以根据屏幕上的位置对延迟进行计时。我猜这是jQuery的可比性问题。淡入淡出与jQuery 3.3.1配合得很好。示例：嗯，现在我很困惑！你说得对，这是你的JSFIDLE，它似乎工作得很好。那么，为什么在我的例子中没有。。。？

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.fadeIn {
opacity: 0;
transform: translate(0, 20px);
transition: all 5s;
}

.fadeIn.visible {
opacity: 1;
transform: translate(0,0);
}