HTML

<div class="container-fluid">
    <div class="row-fluid">
        <div class="span4 option2">
            <p>left column </p>
            <p>The first column has to be the longest The first column has to be the longes</p>
        </div>

        <div class="span4 option2">
            <p>middle column</p>
        </div>

        <div class="span4 option2">
            <p>right column </p>
            <p>right column </p>
            <p>right column </p>
            <p>right column </p>
            <p>right column </p>
        </div>
    </div>
</div>

CSS

.option2 { background: red; border: black 1px solid; color: white; }

JS

$('.option2').css({
    'height': $('.option2').height()
});

试着用弹性盒来做

.container { 显示:flex; padding-bottom: 50 px; ｝ .col { 背景:蓝色; 填充:30 px; ｝ .col。中心{ 背景:红色; 身高:100 px; margin-bottom: -50 px; ｝ < div class = "容器" > < div class = "坳“> < / div > <div class="col center"> center </div> . < div class = "坳“> < / div > < / div >

Live JSFiddle - https://jsfiddle.net/grinmax_/spsn4fnq/

不需要JavaScript。只需添加类.row-等式-height到你现有的.row，就像这样:

<div class="row row-eq-height">
  <div class="col-xs-12 col-sm-4 panel" style="background-color: red">
    some content
  </div>
  <div class="col-xs-6 col-sm-4 panel" style="background-color: yellow">
    kittenz
  <img src="http://placekitten.com/100/100">
  </div>
  <div class="col-xs-6 col-sm-4 panel" style="background-color: blue">
    some more content
  </div>
</div>

提示:如果行中有超过12列，引导网格将无法将其包装。添加一个新的div。row。行-等高每12列。

提示:您可能需要添加

<link rel="stylesheet" href="http://getbootstrap.com.vn/examples/equal-height-columns/equal-height-columns.css" />

到HTML

厚脸皮的jquery解决方案，如果有人感兴趣。只要确保你所有的col (el)有一个共同的类名…如果你将它绑定到$(window).resize，也可以响应

function equal_cols(el)
{
    var h = 0;
    $(el).each(function(){
        $(this).css({'height':'auto'});
        if($(this).outerHeight() > h)
        {
            h = $(this).outerHeight();
        }
    });
    $(el).each(function(){
        $(this).css({'height':h});
    });
}

使用

$(document).ready(function(){
   equal_cols('.selector');
});

注意:这篇文章已经根据@Chris的评论进行了编辑，该代码只在$.each()函数中设置了最后一个最高高度

这是我的解决方案(编译CSS):

.row.row-xs-eq {
  display: table;
  table-layout: fixed;
  margin: 0;
}

.row.row-xs-eq::before {
  content: none;
}

.row.row-xs-eq::after {
  content: none;
}

.row.row-xs-eq > [class^='col-'] {
  display: table-cell;
  float: none;
  padding: 0;
}

@media (min-width: 768px) {
  .row.row-sm-eq {
    display: table;
    table-layout: fixed;
    margin: 0;
  }

  .row.row-sm-eq::before {
    content: none;
  }

  .row.row-sm-eq::after {
    content: none;
  }

  .row.row-sm-eq > [class^='col-'] {
    display: table-cell;
    float: none;
    padding: 0;
  }
}

@media (min-width: 992px) {
  .row.row-md-eq {
    display: table;
    table-layout: fixed;
    margin: 0;
  }

  .row.row-md-eq::before {
    content: none;
  }

  .row.row-md-eq::after {
    content: none;
  }

  .row.row-md-eq > [class^='col-'] {
    display: table-cell;
    float: none;
    padding: 0;
  }
}

@media (min-width: 1200px) {
  .row.row-lg-eq {
    display: table;
    table-layout: fixed;
    margin: 0;
  }

  .row.row-lg-eq::before {
    content: none;
  }

  .row.row-lg-eq::after {
    content: none;
  }

  .row.row-lg-eq > [class^='col-'] {
    display: table-cell;
    float: none;
    padding: 0;
  }
}

所以你的代码看起来像这样:

<div class="row row-sm-eq">
  <!-- your old cols definition here -->
</div>

基本上这和你使用.col-*类的系统是一样的，不同的是你需要对行本身应用.row-*类。

使用.row-sm-eq列将堆叠在XS屏幕上。如果你不需要它们堆叠在任何屏幕上，你可以使用.row-xs-eq。

我们实际使用的SASS版本:

.row {
  @mixin row-eq-height {
    display: table;
    table-layout: fixed;
    margin: 0;

    &::before {
      content: none;
    }

    &::after {
      content: none;
    }

    > [class^='col-'] {
      display: table-cell;
      float: none;
      padding: 0;
    }
  }

  &.row-xs-eq {
    @include row-eq-height;
  }

  @media (min-width: $screen-sm-min) {
    &.row-sm-eq {
      @include row-eq-height;
    }
  }

  @media (min-width: $screen-md-min) {
    &.row-md-eq {
      @include row-eq-height;
    }
  }

  @media (min-width: $screen-lg-min) {
    &.row-lg-eq {
      @include row-eq-height;
    }
  }
}

现场演示

注意:在一行中混合。col-xs-12和。col-xs-6将不能正常工作。

所以，是的，Bootstrap 4确实使一行中所有的cols高度相等，然而，如果你在一行内的内容周围创建边框，你可能会发现它看起来像cols不等高!

当我对col内的元素应用height: 100%时，我发现我失去了边缘。

我的解决方案是在col的div上使用填充(而不是在内部元素上使用边缘)。像这样:

<div class="container">
    <div class="row">
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
        <div class="col-lg-4 col-md-6 col-12 py-4">
            <div class="h-100 border round">
                        ...
            </div>
        </div>
    </div>
</div>

上面的代码示例使用Bootstrap 4.1创建一组带有边框的9个方框