我们在日常的开发中,经常会遇到这样一个问题,就是如何实现居中水平垂直居中对齐。并且在面试中也会出现这样的问题,但是我们往往回答的不是很全部,而导致没有得到面试加分。接下来我们通过不同的方式来实现,让我们成功破解这道面试。
定宽高
一、绝对定位和负magin值
<template>
<div id="app">
<div class="box">
<div class="children-box"></div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
position: relative;
}
.children-box{
position: absolute;
width: 100px; height: 100px;
background: yellow;
left: 50%;
top: 50%;
margin-left: -50px;
margin-top: -50px;
}
</style>
二、绝对定位 + transform
<template>
<div id="app">
<div class="box">
<div class="children-box"></div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
position: relative;
}
.children-box {
position: absolute;
width: 100px;
height: 100px;
background: yellow;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
</style>
三、绝对定位 + left/right/bottom/top + margin
<template>
<div id="app">
<div class="box">
<div class="children-box"></div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
position: relative;
}
.children-box {
position: absolute;
display: inline;
top: 0;
left: 0;
right: 0;
bottom: 0px;
background: yellow;
margin: auto;
height: 100px;
width: 100px;
}
</style>
四、flex布局
<template>
<div id="app">
<div class="box">
<div class="children-box"></div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: flex;
justify-content: center;
align-items: center;
}
.children-box {
background: yellow;
height: 100px;
width: 100px;
}
</style>
五、grid布局
<template>
<div id="app">
<div class="box">
<div class="children-box"></div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: grid;
}
.children-box {
width: 100px;
height: 100px;
background: yellow;
margin: auto;
}
</style>
六、table-cell + vertical-align + inline-block/margin: auto
<template>
<div id="app">
<div class="box">
<div class="children-box"></div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: table-cell;
text-align: center;
vertical-align: middle;
}
.children-box {
width: 100px;
height: 100px;
background: yellow;
display: inline-block;// 可以换成margin: auto;
}
</style>
2、不定宽高
一、绝对定位 + transform
<template>
<div id="app">
<div class="box">
<div class="children-box">111111</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
position: relative;
}
.children-box {
position: absolute;
background: yellow;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
</style>
二、table-cell
<template>
<div id="app">
<div class="box">
<div class="children-box">111111</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: table-cell;
text-align: center;
vertical-align: middle;
}
.children-box {
background: yellow;
display: inline-block;
}
</style>
三、flex布局
<template>
<div id="app">
<div class="box">
<div class="children-box">11111111</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: flex;
justify-content: center;
align-items: center;
}
.children-box {
background: yellow;
}
</style>
四、flex变异布局
<template>
<div id="app">
<div class="box">
<div class="children-box">11111111</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: flex;
}
.children-box {
background: yellow;
margin: auto;
}
</style>
五、grid + flex布局
<template>
<div id="app">
<div class="box">
<div class="children-box">11111111</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: grid;
}
.children-box {
background: yellow;
align-self: center;
justify-self: center;
}
</style>
六、gird + margin布局
<template>
<div id="app">
<div class="box">
<div class="children-box">11111111</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
display: grid;
}
.children-box {
background: yellow;
margin: auto;
}
</style>
七、writing-mode属性布局
<template>
<div id="app">
<div class="box">
<div class="children-box">
<p>11111</p>
</div>
</div>
</div>
</template>
<style type="text/css">
.box {
width: 200px;
height: 200px;
border: 1px solid red;
writing-mode: vertical-lr;
text-align: center;
}
.box>.children-box {
writing-mode: horizontal-tb;
display: inline-block;
text-align: center;
width: 100%;
}
.box>.children-box>p {
display: inline-block;
margin: auto;
text-align: left;
background: yellow;
}
</style>