h-100没显示的原因?因body(父层)没有给宽高
但是直接设body会影响其他人,所以在包一个div给他
<div class="w-25 h-100 bg-success">Apple</div>
解决
<div style="height: 150px; background-color: black">
<div class="w-25 h-100 bg-success">Apple</div>
</div>
1.d-flex 以下换行
<div class="d-flex bg-secondary text-white p-3">
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
</div>
2.d-inline-flex
以下会压在一行里面
<div class="d-inline-flex bg-secondary text-white p-3">
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
</div>
就像这样
数字越小越前面 不输入最大!如:Item2
<div class="d-flex bg-secondary text-white p-3">
<div class="order-3 p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="order-1 p-2 bg-success">Item3</div>
</div>
各种奇怪方法,虽然很奇怪 但是就是有用XD
(1)mr-auto
<div class="d-flex bg-secondary text-white p-3">
<!-- -->
<div class="mr-auto p-2 bg-danger">Item1</div>
<div class=" p-2 bg-warning">Item2</div>
<div class=" p-2 bg-success">Item3</div>
</div>
(2)ml-auto
<div class="d-flex bg-secondary text-white p-3">
<div class=" p-2 bg-danger">Item1</div>
<div class="ml-auto p-2 bg-warning">Item2</div>
<div class=" p-2 bg-success">Item3</div>
</div>
(3)hr
<div class="d-flex bg-secondary text-white p-3">
<div class="p-2 bg-danger">Item1</div>
<hr />
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
</div>
.justify-content-设定父
<div class="d-flex justify-content-center bg-secondary text-white">
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
</div>
.align-items-设定父
<div class="d-flex align-items-center bg-secondary text-white" style="height: 150px">
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
</div>
.align-content-设定父
<div class="d-flex align-content-center flex-wrap bg-secondary text-white p-3" style="height: 150px">
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
<div class="p-2 bg-danger">Item1</div>
<div class="p-2 bg-warning">Item2</div>
<div class="p-2 bg-success">Item3</div>
</div>
.align-self-设定子
<div class="d-flex bg-secondary text-white p-3" style="height: 150px">
<div class="align-self-start p-2 bg-danger">Item1</div>
<div class="align-self-center p-2 bg-warning">Item2</div>
<div class="align-self-end p-2 bg-success">Item3</div>
</div>
(档案css20_(抓标签位置笔记)combinator_selectors)
查css看是否有 1.空白 2.>
记忆法 後裔选择器
1. nav 里面所有的nav-item(爸爸 孙子 *包容)
2. > nav 底下一层的nav-item(爸爸 *针对)
3. ~ nav 之後所有的nav-item(同一层)(河流~)
4. + nav 同一层之後的第一个nav-item(*1+1=2,只有一个)
<ul class="nav nav-pills nav-fill">
<li class="nav-item">
<a class="nav-link active" href="#">Active</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Much longer nav link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
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