CSS布局实战

时间：2021-08-22 04:01:22

1、 ul li中上图下字，图片、文字居中。

<ul>

    <li>

        <img src="dash.png" style="display:block;height:20px;width:20px;margin: 0 auto">

        <span style="float:left;text-align:center;">Dashboard</span>

    </li>

</ul>

CSS布局实战

文字换行：display:block

图片居中：margin: 0 auto

文字居中：float:left;text-align:center

2、页面遮罩的实现

z-index属性决定了元素的显示层级，z-index越大，显示层级越靠上。

opacity表示透明度。

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gbk" />

<title>html 最简遮罩层</title>

<script type="text/javascript">

function showDiv(){

    document.getElementById('popDiv').style.display='block';

    document.getElementById('bg').style.display='block';

}

function closeDiv(){

    document.getElementById('popDiv').style.display='none';

    document.getElementById('bg').style.display='none';

}

</script>

</head>

<body>

    <div id="popDiv" style="z-index:99;display:none;position:absolute;margin-top: 20%;margin-left: 40%;background-color: #FFF;">

        分析中...<br/>

        <a href="javascript:closeDiv()">关闭遮罩层</a>

    </div>

    <div id="bg" style="display:block;background-color: #ccc;width: 100%;position:absolute;height: 100%;opacity: 0.5;z-index: 1;"></div>

    <div style="padding-top: 10%;padding-left:40%;z-index:1;">

        <input type="Submit" name="" value="打开遮罩层" onclick="javascript:showDiv()" />

    </div>

</body>

</html>

3、样式优先级!important

.menu_accordion .nav-first-level li div

{

  background-color:#FFFFFF!important;

}

4、阻止div换行

（1）使用tbale封装div为列

（2）使用样式float:left;

（3）使用样式display:inline;

<html>

<head>

    <style type="text/css">

        .myrow{

            border:#c3c3c3 1px solid;

            height:30px;

            margin:5px;

        }

        .myfloat{

            float:left;

            margin:2px;

        }

        .mydisplay{

            display:inline;

            margin:2px;

        }

        .myline{

            border-style:solid;

            border-color:#c3c3c3;

            border-width:0px 0px 0px 1px;

            height:20px;

        }

    </style>

</head>

<body>

    <div id="row1" class="myrow">

      <table>

      <tbody>

      <tr>

        <td>

            <div>

            根因1

            </div>

        </td>

        <td>

            <div>

            </div>

        </td>

        <td>

            <div>

            故障场景1

            </div>

        </td>

        <td>

            <div>

            </div>

        </td>

      </tr>

      </tbody>

      </table>

    </div>

    <div id="row2" class="myrow" style="height:30px">

        <div class="myfloat">

        根因2

        </div>

        <div class="myfloat myline" >

        </div>

        <div class="myfloat">

        故障场景2

        </div>

        <div class="myfloat">

        </div>

    </div>

    <div id="row3" class="myrow">

        <div class="mydisplay">

        根因3

        </div>

        <div class="mydisplay">

        </div>

        <div class="mydisplay">

        故障场景3

        </div>

        <div class="mydisplay">

        </div>

    </div>

</body>

</html>
<html>

<head>

    <style type="text/css">

        .myrow{

            border:#c3c3c3 1px solid;

            height:26px;

            margin:5px;

            width:90%;

        }

        div div{

            float:left;

            height:26px;

            margin:2px 5px 2px 5px;

        }

        .myline{

            border-style:solid;

            border-color:#c3c3c3;

            border-width:0px 0px 0px 1px;

            height:20px;

        }

        .myid{

            width:10%;

        }

        .mycause{

            width:70%;

        }

        .myimg{

            background-image: url(myimg.png);

            background-color: #FFFFFF;

            width:23px;

            height:23px;

            margin:3px 0px 3px 5px;

        }

        body{

            font-size:15px;

            color:#666;

            font-family:"Helvetica","微软雅黑";

        }

    </style>

</head>

<body>

    <div class="myrow">

        <div class="myimg">

        </div>

        <div class="myid" >

        根因1

        </div>

        <div class="myline" >

        </div>

        <div class="mycause" >

        故障场景1

        </div>

        <input type="checkbox" style="margin:7px">

        <div>

        </div>

    </div>

    <div class="myrow">

        <div class="myimg">

        </div>

        <div class="myid" >

        根因2

        </div>

        <div class="myline" >

        </div>

        <div class="mycause" >

        故障场景2

        </div>

        <input type="checkbox" style="margin:7px">

        <div>

        </div>

    </div>

</body>

</html>

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