《Web开发中让盒子居中的几种方法》_html/css

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《Web开发中让盒子居中的几种方法》_html/css_WEB-ITnose

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Jun 24, 2016 am 11:15 AM

一、记录下几种盒子居中的方法：

1.0、margin固定宽高居中；

2.0、负margin居中；

3.0、绝对定位居中；

4.0、table-cell居中；

5.0、flex居中；

6.0、transform居中；

7.0、不确定宽高居中(绝对定位百分数)；

8.0、button居中。

二、代码演示(html使用同一个Demo)：

html Demo：

<body>    <div id="container">        <div id="box"></div>    </div></body>

1.0、margin固定宽高居中(演示)

这种定位方法纯粹是靠宽高和margin拼出来的，不是很灵活。

CSS：

#container {    width: 600px;    height: 500px;    border: 1px solid #000;    margin: auto;}#box {    width: 200px;    height: 200px;    margin: 150px 200px;    background-color: #0ff;}

2.0、负margin居中(演示)

利用负的margin来进行居中，需要知道固定宽高，限制比较大。

CSS:

#container {    position: relative;    width: 600px;    height: 500px;    border: 1px solid #000;    margin: auto;}#box {    position: absolute;    width: 200px;    height: 200px;    left: 50%;    top: 50%;    margin: -100px -100px;    background-color: #0ff;}

3.0、绝对定位居中(演示)

利用绝对定位居中，非常常用的一种方法。

CSS:

#container {    position: relative;    width: 600px;    height: 500px;    border: 1px solid #000;    margin: auto;}#box {    position: absolute;    width: 200px;    height: 200px;    left: 0;    top: 0;    right: 0;    bottom: 0;    margin: auto;    background-color: #0ff;}

4.0、table-cell居中(演示)

利用table-cell来控制垂直居中。

CSS:

#container {    display: table-cell;    width: 600px;    height: 500px;    vertical-align: middle;    border: 1px solid #000;}#box {    width: 200px;    height: 200px;    margin: 0 auto;    background-color: #0ff;}

5.0、flex居中(演示)

CSS3中引入的新布局方式，比较好用。缺点：IE9以及IE9一下不兼容。

CSS:

#container {    display: -webkit-flex;    display: flex;    -webkit-align-items: center;            align-items: center;    -webkit-justify-content: center;            justify-content: center;    width: 600px;    height: 500px;    border: 1px solid #000;    margin: auto;}#box {    width: 200px;    height: 200px;    background-color: #0ff;}

6.0、transform居中(演示)

这种方法灵活运用CSS中transform属性，较为新奇。缺点是IE9下不兼容。

CSS:

#container {    position: relative;    width: 600px;    height: 600px;    border: 1px solid #000;    margin: auto;}#box {    position: relative;    top: 50%;    left: 50%;    width: 200px;    height: 200px;    transform: translate(-50%, -50%);    -webkit-transform: translate(-50%, -50%);    -ms-transform: translate(-50%, -50%);    -moz-transform: translate(-50%, -50%);    background-color: #0ff;}

7.0、不确定宽高居中(绝对定位百分数)(演示)

这种不确定宽高的居中，较为灵活。只需要保证left和right的百分数一样就可以实现水平居中，保证top和bottom的百分数一样就可以实现垂直居中。

CSS:

#container {    position: relative;    width: 600px;    height: 500px;    border: 1px solid #000;    margin: auto;}#box {    position: absolute;    left: 30%;    right: 30%;    top: 25%;    bottom: 25%;    background-color: #0ff;}

8.0、button居中(演示)

利用button做外容器，里边的块元素会自动垂直居中，只需要控制一下水平居中就可以达到效果。

HTML：

<button>    <div></div></button>

CSS：

button {    width: 600px;    height: 500px;    border: 1px solid #000;}div {    width: 200px;    height: 200px;    margin: 0 auto;    background-color: #0ff;}

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