根据另一个Div维持身高

Question

.col-6 h1 {
  color: white;
  text-align: center;
}
h1 {
  background-color: red;
}

.COL1, .COL2 {
  border: 1px solid red;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<br></br>
<div class='container'>
  <div class='row'>
    <div class='col-6 COL1'>
      Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi nibh habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.
    </div>
    <div class='col-6 COL2'>
      <h1>ADVERTISE</h1>
      <div>Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi nibh habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.</div>
      <h1>ADVERTISE</h1>
    </div>
  </div>
</div>

现在这个HTML就是这样的

但我想要的是让 Lorem ipsum 文字获得溢出：滚动保持 COL2的高度等于 COL1 ，就像这样

如果 Lorem Ipsum 文字太短而不是溢出，那么它只会得到就像这样

将 BOTTOM 保持 BOTTOM 最大高度 Lorem Ipsum 可以到达。

是否可以使用 Bootstrap 或 CSS 而不使用 JS ？

P.S。 COL1 没有/不能固定高度。

Answer 1

将position:absolute添加到COL2的所有孩子身上，这样就无法使COL2的身高生效。

.col-6 h1 {
  color: white;
  text-align: center;
}

h1 {
  background-color: red;
  position: absolute;
  left: 0;
  right: 0;
  height: 50px;
  margin: 0 !important;
}

.COL1,
.COL2 {
  border: 1px solid red;
}

.COL2 .top-banner {
  top: 0;
}

.COL2 .bottom-banner {
  bottom: 0;
}

.COL2 div {
  position: absolute;
  top: 50px;
  left: 0;
  bottom: 50px;
  right: 0;
  overflow: auto;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class='container'>
  <div class='row'>
    <div class='col-6 COL1'>
      Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper
      curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi nibh
      habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.
    </div>
    <div class='col-6 COL2'>
      <h1 class="top-banner">ADVERTISE</h1>
      <div>Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper
        curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi
        nibh habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.</div>
      <h1 class="bottom-banner">ADVERTISE</h1>
    </div>
  </div>
</div>

Answer 2

使用此代码

<!DOCTYPE html>
<html>
<head>
  <title></title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
  <style type="">
    .col-6 h1 {
  color: white;
  text-align: center;
}
h1 {
  background-color: red;
}

.COL1, .COL2 {
  height: 250px;
  border: 1px solid red;
}

#overflow{
  height: 145px;
  overflow: scroll;
}
section{
  height: 250px;
}
</style>
</head>
<body>
  <section>
    <div class='container'>
    <div class='row'>
      <div class='col-6 COL1'>
        Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi nibh habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.
      </div>
      <div class='col-6 COL2'>
        <h1>ADVERTISE</h1>
        <div id = overflow>Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi nibh habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.</div>
        <h1>ADVERTISE</h1>
      </div>
    </div>
  </div>
  </section>


</body>
</html>

我认为这会对你有帮助....