我的Bootstrap 4响应式列布局不起作用 [英] My Bootstrap 4 responsive column layout not working

问题描述

因此，我使用Bootstrap 4创建了一个非常简单的响应式网站布局，因此根据代码，当它进入平板电脑模式时，列数应变为4，即，当视口为768px宽，而我的显示尺寸为770px时则显示4列，但当它变为769px时，它将切换到智能手机模式，并采用整个宽度并将其堆叠在一起.

So I made a very simple responsive website layout using Bootstrap 4 so according to the code the no of columns should become 4 when it enters tablet mode ie when the viewport is 768px wide while mine is fine up to 770px showing 4 columns but when it becomes 769px it switches into smartphone mode and take the entire width and stacks on top of each other.

<div class="row">
  <div class="col-lg-2 col-md-3 col-sm-12" style="background-color:red;">
    col
  </div>
  <div class="col-lg-2 col-md-3 col-sm-12" style="background-color:red;">
    col
  </div>
  <div class="col-lg-2 col-md-3 col-sm-12" style="background-color:red;">
    col
  </div>
  <div class="col-lg-2 col-md-3 col-sm-12" style="background-color:red;">
    col
  </div>
  <div class="col-lg-2 col-md-3 col-sm-12" style="background-color:red;">
    col
  </div>
  <div class="col-lg-2 col-md-3 col-sm-12" style="background-color:red;">
    col
  </div>
</div>

推荐答案

与Bootstrap 3不同，Bootstrap 4具有一些不同的

Unlike Bootstrap 3, Bootstrap 4 has a bit different grid system. Here sm starts to act since <768px. and the xs breakpoint now is just col. Here, rewritten a bit.

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.min.js"></script>

<div class="container">
  <div class="row">
    <div class="col-lg-2 col-sm-3 col-12" style="background-color:red;">
      col
    </div>
    <div class="col-lg-2 col-sm-3 col-12" style="background-color:red;">
      col
    </div>
    <div class="col-lg-2 col-sm-3 col-12" style="background-color:red;">
      col
    </div>
    <div class="col-lg-2 col-sm-3 col-12" style="background-color:red;">
      col
    </div>
    <div class="col-lg-2 col-sm-3 col-12" style="background-color:red;">
      col
    </div>
    <div class="col-lg-2 col-sm-3 col-12" style="background-color:red;">
      col
    </div>
  </div>
</div>

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