CSS的flex在布局中的用法

元素居中

【1】伸縮容器上使用主軸對齊justify-content和側軸對齊align-items

<style>.parent{
    display: flex;
    justify-content: center;
    align-items: center;}</style>
<div class="parent"  style="background-color: lightgrey; height: 100px; width: 200px;">
    <div class="in" style="background-color: lightblue;">DEMO</div>      </div>

【2】在伸縮項目上使用margin:auto

<style>.parent{
    display: flex;}.in{
    margin: auto;}</style>
<div class="parent"  style="background-color: lightgrey;height: 100px;width: 200px;">
    <div class="in" style="background-color: lightblue;">DEMO</div>      </div>

兩端對齊

<style>.parent{
   display: flex;    
   justify-content:space-between
   }
</style>
<div class="parent"  style="background-color: lightgrey;height: 100px;width: 200px;">
    <div class="in" style="background-color: lightblue;">DEMO</div>
    <div class="in" style="background-color: lightgreen;">DEMO</div>
    <div class="in" style="background-color: lightcyan;">DEMO</div>    
    <div class="in" style="background-color: lightseagreen;">DEMO</div>     
 </div>

底端對齊

<style>.parent{
    display: flex;
    align-items: flex-end;
    }
</style>
<div class="parent"  style="background-color: lightgrey;height: 100px;width: 200px;">
    <div class="in" style="background-color: lightblue; height:20px;">DEMO</div>
    <div class="in" style="background-color: lightgreen; height:30px;">DEMO</div>
    <div class="in" style="background-color: lightcyan; height:40px;">DEMO</div>
    <div class="in" style="background-color: lightseagreen; height:50px;">DEMO</div>      
</div>

輸入框按鈕

<style>.inputBox{
    display: flex;
    width: 250px;}.inputBox-ipt{
    flex: 1;}
</style>
<div class="inputBox">
  <input class="inputBox-ipt">
  <button class="inputBox-btn">按鈕</button>
</div>

等分布局

<style>body,p{margin: 0;}.parent{
    display: flex;}.child{
    flex:1;
    height: 100px;}.child + .child{
    margin-left: 20px;}
</style>
<div class="parent" style="background-color: lightgrey;">
    <div class="child" style="background-color: lightblue;">1</div>
    <div class="child" style="background-color: lightgreen;">2</div>
    <div class="child" style="background-color: lightsalmon;">3</div>
    <div class="child" style="background-color: pink;">4</div>                
</div>

多列自適應布局

<style>p{margin: 0;}.parent{display: flex;}.left,.center{margin-right: 20px;}.right{flex: 1;}</style>
<div class="parent" style="background-color: lightgrey;">
    <div class="left" style="background-color: lightblue;">
        <p>left</p>
        <p>left</p>
    </div>            
    <div class="center" style="background-color: pink;">
        <p>center</p>
        <p>center</p>
    </div>            
    <div class="right"  style="background-color: lightgreen;">
        <p>right</p>
        <p>right</p>
    </div>                    
</div>

懸掛布局

<style>        
     .box{
    display: flex;
    background-color: lightgrey;
    width: 300px;}.left{
    margin-right: 20px;
    background-color: lightblue;
    height: 30px;}.main{
    flex:1;}
 </style>
<div class="box">
    <div class="left">左側懸掛</div>
    <div class="main">主要內容主要內容主要內容主要內容主要內容主要內容主要內容主要內容主要內容主要內容主要內容主要內容主要內容</div>    
</div>

全屏布局

<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.parent{
    display: flex;
    flex-direction: column;}.top,.bottom{
    height: 50px;}.middle{
    display: flex;
    flex: 1;}.left{
    width: 100px;
    margin-right: 20px;}.right{
    flex: 1;
    overflow: auto;}.right-in{
    height: 1000px;}</style>
<div class="parent" id="parent" style="background-color: lightgrey;">
    <div class="top" style="background-color: lightblue;">
        <p>top</p>
    </div> 
    <div class="middle" style="background-color: pink;">
        <div class="left" style="background-color: orange;">
            <p>left</p>
        </div>     
        <div class="right" style="background-color: lightsalmon;">
            <div class="right-in">
                <p>right</p>
            </div>            
        </div>                    
    </div>              
    <div class="bottom" style="background-color: lightgreen;">
        <p>bottom</p>
    </div>        
</div>

以上就是CSS彈性盒模型flex在布局中的使用方法的詳細內容，更多請關注億速云其它相關文章！