Java复习打卡day46
flex弹性布局
flex弹性布局的体验
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#oBox{width: 100%;height: 300px;background-color: #222;
display: flex;
/* 水平居中 两端对齐 */
justify-content: space-between;
/* 垂直居中 */
align-items: center;
}
#os{width: 200px;height: 200px;background-color: #fff;}
</style>
</head>
<body>
<h1>flex弹性布局的体验</h1>
<div id="oBox">
<div id="os"></div>
<div id="os"></div>
<div id="os"></div>
<div id="os"></div>
</div>
</body>
</html>
flex-direction
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#oBox{width: 100%; height: 600px;background-color: aqua; border: 2px solid #222;
display: flex;
/* flex-direction设置内容沿着坐标轴的方向排列 */
/* 默认是row 水平自左向右延伸 */
/* flex-direction: row; */
/* 设置水平自右向左延伸 */
/* flex-direction: row-reverse; */
/* 垂直延伸 自上向下延伸*/
/* flex-direction: column; */
/* 自下向上延伸 */
flex-direction: column-reverse;
}
#os{
width: 100px;
height: 100px;
background-color: orange;
}
</style>
</head>
<body>
<h1>flex弹性布局--flex-direction</h1>
<div id="oBox">
<div id="os">1</div>
<div id="os">2</div>
<div id="os">3</div>
<div id="os">4</div>
</div>
</body>
</html>
justify-content
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#oBox{
width: 100%;
height: 600px;
background-color: aqua;
border: 2px solid #222;
/* 容器 */
display: flex;
/* justify-content设置元素在主轴上的排列方式 */
/* 首部对齐 */
justify-content: flex-start;
/* 尾部对齐 */
justify-content: flex-end;
/* 居中对齐 */
justify-content: center ;
/* 平分水平空间对齐 */
justify-content: space-around;
/* 先两端再平分剩余空间 */
justify-content: space-between;
}
#os{
width: 100px;
height: 100px;
background-color: rebeccapurple;
}
</style>
</head>
<body>
<div id="oBox">
<div id="os">1</div>
<div id="os">2</div>
<div id="os">3</div>
<div id="os">4</div>
</div>
</body>
</html>
flex-wrap
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#oBox{
width: 800px;
height: 600px;
background-color: aqua ;
border: 2px solid #222;
display: flex;
/* 默认不换行，当子项的宽度比父项宽时，子项会被缩小，这时子项的宽度只是不生效，还是必须要设置的 */
flex-wrap: Nowrap;
/* 当子项的宽度大于父项的宽度时 换行 */
/* flex-wrap: wrap; */
}
#os{
width: 400px;
height: 100px;
background-color: orange;
margin: 1px;
}
</style>
</head>
<body>
<h1>flex弹性布局--flex-wrap</h1>
<div id="oBox">
<div id="os">1</div>
<div id="os">2</div>
<div id="os">3</div>
<div id="os">4</div>
</div>
</body>
</html>
align-items
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.oBox{
width: 100%;
height: 600px;
border: 2px solid #222;
background-color: aqua;
display: flex;
/* 默认的是从上到下 */
align-items: flex-start;
/* 从下到上 */
align-items: flex-end;
/* 居中 */
align-items: center;
/* 拉伸:如果项目为设置高度或者高度设置为auto，则拉伸直父项的高度 */
align-items: stretch;
}
.os{
width: 100px ;
/* height: 100px; */
background-color: orange;
margin: 5px;
}
</style>
</head>
<body>
<h1>flex流式布局--align-items</h1>
<div class="oBox">
<div class="os">1</div>
<div class="os">2</div>
<div class="os">3</div>
<div class="os">4</div>
</div>
</body>
</html>
align-content
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<Meta http-equiv="X-UA-Compatible" content="IE=edge">
<Meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.oBox{
width: 600px;
height: 600px;
border: 2px solid #222;
background-color: aqua;
display: flex;
/* align-content只有当容器内的元素出现了换行或者多行的情况下才会渲染出效果 */
flex-wrap: wrap;
align-content: flex-start;
align-content: flex-end;
align-content: center;
align-content: space-around;
align-content: space-between;
align-content: stretch;
}
.os{
width: 200px;
/* height: 200px; */
background-color: orange;
margin: 5px;
}
</style>
</head>
<body>
<h1>flex布局--align-content</h1>
<div class="oBox">
<div class="os">1</div>
<div class="os">2</div>
<div class="os">3</div>
<div class="os">4</div>
</div>
</body>
</html>
