对齐项目（Align Items）

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2023-12-01

align-items属性与justify content相同。但在这里，物品在交叉通道（垂直）上对齐。

Usage -

align-items: flex-start | flex-end | center | baseline | stretch;

此属性接受以下值 -

flex-start - 弹性项目在容器顶部垂直对齐。
flex-end - 弹性项目在容器底部垂直对齐。
flex-center - 弹性项目在容器的中心垂直对齐。
stretch - 柔性物品垂直对齐，使它们填满容器的整个垂直空间。
baseline - 对齐flex项目，使其文本的基线沿水平线对齐。

flex-start

将此值传递给属性align-items时，Flex项目在容器顶部垂直对齐。

以下示例演示将值flex-start传递给align-items属性的结果。

<!doctype html>
<html lang = "en">
   <style>
      .box1{background:green;}
      .box2{background:blue;}
      .box3{background:red;}
      .box4{background:magenta;}
      .box5{background:yellow;}
      .box6{background:pink;}
      .box{
         font-size:35px;
         padding:15px;
      }
      .container{
         display:flex;
         height:100vh;
         align-items:flex-start;
      }
   </style>
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
         <div class = "box box4">four</div>
         <div class = "box box5">five</div>
         <div class = "box box6">six</div>
      </div>
   </body>
</html>

flex-end

将此值传递给属性align-items ，flex-items在容器的底部垂直对齐。

以下示例演示将值flex-end传递给align-items属性的结果。

<!doctype html>
<html lang = "en">
   <style>
      .box1{background:green;}
      .box2{background:blue;}
      .box3{background:red;}
      .box4{background:magenta;}
      .box5{background:yellow;}
      .box6{background:pink;}
      .box{
         font-size:35px;
         padding:15px;
      }
      .container{
         display:flex;
         height:100vh;
         align-items:flex-end;
      }
   </style>
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
         <div class = "box box4">four</div>
         <div class = "box box5">five</div>
         <div class = "box box6">six</div>
      </div>
   </body>
</html>

center

将此值传递给属性align-items ，flex-items在容器的中心垂直对齐。

以下示例演示将值flex-center传递给align-items属性的结果。

<!doctype html>
<html lang = "en">
   <style>
      .box1{background:green;}
      .box2{background:blue;}
      .box3{background:red;}
      .box4{background:magenta;}
      .box5{background:yellow;}
      .box6{background:pink;}
      .box{
         font-size:35px;
         padding:15px;
      }
      .container{
         display:flex;
         height:100vh;
         align-items:center;
      }
   </style>
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
         <div class = "box box4">four</div>
         <div class = "box box5">five</div>
         <div class = "box box6">six</div>
      </div>
   </body>
</html>

stretch

将此值传递给属性align-items ，flex-items将垂直对齐，以便它们填满容器的整个垂直空间。

以下示例演示将值stretch传递给align-items属性的结果。

<!doctype html>
<html lang = "en">
   <style>
      .box1{background:green;}
      .box2{background:blue;}
      .box3{background:red;}
      .box4{background:magenta;}
      .box5{background:yellow;}
      .box6{background:pink;}
      .box{
         font-size:35px;
         padding:15px;
      }
      .container{
         display:flex;
         height:100vh;
         align-items:stretch;
      }
   </style>
   <body>
      <div class = "container">
         <div class = "box box1">One</div>
         <div class = "box box2">two</div>
         <div class = "box box3">three</div>
         <div class = "box box4">four</div>
         <div class = "box box5">five</div>
         <div class = "box box6">six</div>
      </div>
   </body>
</html>

baseline

将此值传递给属性align-items ，将对齐flex-items，使其文本的基线沿水平线对齐。

以下示例演示了将值baseline传递给align-items属性的结果。

<!doctype html>
<html lang = "en">
   <style>
      .box1{background:green;}
      .box2{background:blue;}
      .box3{background:red;}
      .box4{background:magenta;}
      .box5{background:yellow;}
      .box6{background:pink;}
      .box{
         font-size:35px;
         padding:15px;
      }
      .container{
         display:flex;
         height:100vh;
         align-items:baseline;
      }
   </style>
   <body>
      <div class = "container">
      <div class = "box box1">One</div>
      <div class = "box box2">two</div>
      <div class = "box box3">three</div>
      <div class = "box box4">four</div>
      <div class = "box box5">five</div>
      <div class = "box box6">six</div>
      </div>
   </body>
</html>