您可以检查窗口的高度和滚动顶部的组合结果是否大于主体的结果

如果窗口。innerHeight +窗口。scroll> = document.body.scrollHeight) {}

window.onscroll = function(ev) {
    if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight) {
        // you're at the bottom of the page
    }
};

看到演示

我发现有两种方法对我很有效:

  window.addEventListener('scroll', function(e) {
    if (
      window.innerHeight + document.documentElement.scrollTop ===
      document.documentElement.offsetHeight
    ) {
      console.log('You are at the bottom')
    }
  })

另一个是:

  window.addEventListener('scroll', function(e) {
    if (
      window.innerHeight + window.pageYOffset ===
      document.documentElement.offsetHeight
    ) {
      console.log('You are at the bottom')
    }
  })

如果你喜欢jquery

$(window).scroll(function() {
  if($(window).scrollTop() + $(window).height() >= $(document).height()) {
    // doSomethingHere();
  }
});

我一直在寻找答案，但还没有找到确切的答案。这是一个纯javascript解决方案，与最新的Firefox, IE和Chrome在这个答案的时间:

// document.body.scrollTop alone should do the job but that actually works only in case of Chrome.
// With IE and Firefox it also works sometimes (seemingly with very simple pages where you have
// only a <pre> or something like that) but I don't know when. This hack seems to work always.
var scrollTop = (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;

// Grodriguez's fix for scrollHeight:
// accounting for cases where html/body are set to height:100%
var scrollHeight = (document.documentElement && document.documentElement.scrollHeight) || document.body.scrollHeight;

// >= is needed because if the horizontal scrollbar is visible then window.innerHeight includes
// it and in that case the left side of the equation is somewhat greater.
var scrolledToBottom = (scrollTop + window.innerHeight) >= scrollHeight;

// As a bonus: how to scroll to the bottom programmatically by keeping the horizontal scrollpos:
// Since window.innerHeight includes the height of the horizontal scrollbar when it is visible
// the correct vertical scrollTop would be
// scrollHeight-window.innerHeight+sizeof(horizontal_scrollbar)
// Since we don't know the visibility/size of the horizontal scrollbar
// we scroll to scrollHeight that exceeds the value of the
// desired scrollTop but it seems to scroll to the bottom with all browsers
// without problems even when the horizontal scrollbar is visible.
var scrollLeft = (document.documentElement && document.documentElement.scrollLeft) || document.body.scrollLeft;
window.scrollTo(scrollLeft, scrollHeight);

window.onscroll = function(ev) {
    if ((window.innerHeight + Math.ceil(window.pageYOffset)) >= document.body.offsetHeight) {
        alert("you're at the bottom of the page");
    }
};

这个答案将修复边缘情况，这是因为pageYOffset是double，而innerHeight和offsetHeight是长，所以当浏览器给你的信息，你可能是一个像素短。 例如:在这一页的底部

真正的窗口。innerHeight = 10.2

真正的窗口。pageYOffset = 5.4

true document.body.offsetHeight = 15.6

我们的计算结果是: 10 + 5.4 >= 16，是错误的

要解决这个问题，我们可以用数学。pageYOffset值上的ceil。

希望这能有所帮助。