小附录:仅限滚动，如果最后一行已经可见。如果滚动一点点，将内容留在原地(注意:没有测试过不同的字体大小。这可能需要在">= compare "中进行一些调整):

var objDiv = document.getElementById(id);
var doScroll=objDiv.scrollTop>=(objDiv.scrollHeight-objDiv.clientHeight);                   

// add new content to div
$('#' + id ).append("new line at end<br>"); // this is jquery!

// doScroll is true, if we the bottom line is already visible
if( doScroll) objDiv.scrollTop = objDiv.scrollHeight;

我也遇到过同样的问题，但有一个额外的限制:我无法控制向滚动容器追加新元素的代码。我在这里找到的例子都不允许我这样做。这是我最终得到的解决方案。

它使用Mutation observer (https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver)，这使得它只能在现代浏览器上使用(尽管存在填充程序)

所以基本上代码就是这样做的:

var scrollContainer = document.getElementById("myId");

// Define the Mutation Observer
var observer = new MutationObserver(function(mutations) {

  // Compute sum of the heights of added Nodes
  var newNodesHeight = mutations.reduce(function(sum, mutation) {
      return sum + [].slice.call(mutation.addedNodes)
        .map(function (node) { return node.scrollHeight || 0; })
        .reduce(function(sum, height) {return sum + height});
  }, 0);

  // Scroll to bottom if it was already scrolled to bottom
  if (scrollContainer.clientHeight + scrollContainer.scrollTop + newNodesHeight + 10 >= scrollContainer.scrollHeight) {
    scrollContainer.scrollTop = scrollContainer.scrollHeight;
  }

});

// Observe the DOM Element
observer.observe(scrollContainer, {childList: true});

我做了一把小提琴来演示这个概念: https://jsfiddle.net/j17r4bnk/

试试下面的代码:

const scrollToBottom = (id) => {
    const element = document.getElementById(id);
    element.scrollTop = element.scrollHeight;
}

你也可以使用Jquery使滚动平滑:

const scrollSmoothlyToBottom = (id) => {
    const element = $(`#${id}`);
    element.animate({
        scrollTop: element.prop("scrollHeight")
    }, 500);
}

下面是演示

下面是它的工作原理:

参考:scrollTop, scrollHeight, clientHeight

Javascript或jquery:

var scroll = document.getElementById('messages');
   scroll.scrollTop = scroll.scrollHeight;
   scroll.animate({scrollTop: scroll.scrollHeight});

Css:

 .messages
 {
      height: 100%;
      overflow: auto;
  }

为什么不使用简单的CSS来做到这一点呢?

诀窍是使用display: flex;和弯曲方向:列反向;

Here is a working example. https://codepen.io/jimbol/pen/YVJzBg

您可以使用Element.scrollTo()方法。

它可以使用内置的浏览器/操作系统动画，所以它非常流畅。

function scrollToBottom() { const scrollContainer = document.getElementById('container'); scrollContainer.scrollTo({ top: scrollContainer.scrollHeight, left: 0, behavior: 'smooth' }); } // initialize dummy content const scrollContainer = document.getElementById('container'); const numCards = 100; let contentInnerHtml = ''; for (let i=0; i<numCards; i++) { contentInnerHtml += `<div class="card mb-2"><div class="card-body">Card ${i + 1}</div></div>`; } scrollContainer.innerHTML = contentInnerHtml; .overflow-y-scroll { overflow-y: scroll; } <link href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" rel="stylesheet"/> <div class="d-flex flex-column vh-100"> <div id="container" class="overflow-y-scroll flex-grow-1"></div> <div> <button class="btn btn-primary" onclick="scrollToBottom()">Scroll to bottom</button> </div> </div>