不定宽元素居中的方法

做分页时经常需要将不定宽元素居中

方法1：将外层元素设: text-align: center，将不定宽元素舍：display: inline

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        div {
            height: 100px;
            margin: 20px;
            border: 1px red solid;
        }
        .wrap {
            text-align: center;
        }
        .wrap ul{
            list-style:none;
            display:inline;
        }

        .wrap li{
            margin-right:8px;
            display:inline;
        }
    </style>
</head>
<body>

    <div class="wrap">
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
        </ul>
    </div>
</body>
</html>

原理是利用内块级元素的text-align:center时，它下面的的内联元素会水平居中。

方法二：

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            list-style:none;
        }

        div {
            height: 100px;
            border: 1px red solid;
        }
        .wrap {
            position: relative;
            float: left;
            left: 50%;
        }
        .wrap ul{
            position: relative;
            left: -50%; /*相对于父元素的宽度*/
        }

        .wrap li{
            float: left;
            margin-right:8px;
            display: inline;
        }
    </style>
</head>
<body>

    <div class="wrap">
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
        </ul>
    </div>
</body>
</html>

posted on 2017-02-05 17:12 码先生阅读(161) 评论(0) 编辑收藏举报