清除浮动css详解

<img src="img/qq2.jpg" style="float: left;" />

CSS定位position：

static relative abslute fixed

1.relative相对定位

 

.s1{
    width: 100px;
    height: 60px;
    background: silver;
    float: left;
    margin-left:10px ;
    
}
#special{
    position: relative;/*相对定位*/
    left: 40px;/*在原来的位置向左移的大小*/
    top: 100px;/*向下移动*//
}
View Code
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <link rel="stylesheet" href="css/relative.css" />
    </head>
    <body>
        <div class="s1">内容一</div>
        <div id="special"class="s1">内容一</div>
        <div class="s1">内容一</div>
        <div class="s1">内容一</div>
                <div class="s1">内容一</div>
        <div class="s1">内容一</div>
    </body>
</html>
View Code

 left 与top来进行定位，参照点是它原来的位置作为参照点

2.abslute绝对定位（对离自己最近的元素为参照点）

此时的参照为body

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <link rel="stylesheet" href="css/relative.css" />
    </head>

    <body>
        <div class="s1">内容一</div>
        <div class="s1" id="special">内容二 </div>
        <div class="s1">内容三</div>
        <div class="s1">内容四</div>
        <div class="s1">内容五</div>
        <div class="s2">HELLO</div>
    </body>

</html>
View Code
.s1{
    width: 100px;
    height: 60px;
    background: silver;
    float: left;
    margin-left:10px ;
    
}
#special{
    position: relative;/*相对定位*/
    left: 40px;/*在原来的位置向左移的大小*/
    top: 100px;/*向下移动*//
}
.s2{
    position: relative;
    left: 200px;
    top: 100px;
    width: 300px;
    height: 100px;
    background: green;
    float: left;
}
View Code

以离自己最近的非标准流作为参考点

 

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <link rel="stylesheet" href="css/relative.css" />
    </head>

    <body>
        <div class="s1">内容一</div>

        <div class="s1">内容三</div>
        <div class="s1">内容四</div>
        <div class="s1">内容五</div>
        <div class="s2">
            <div class="s1" id="special">内容二 </div>
        </div>
    </body>

</html>
View Code
.s1{
    width: 100px;
    height: 60px;
    background: silver;
    float: left;
    margin-left:10px ;
    
}
#special{
    position: relative;/*相对定位*/
    left: 40px;/*在原来的位置向左移的大小*/
    top: 100px;/*向下移动*//
}
.s2{
    position: relative;
    left: 200px;
    top: 100px;
    width: 300px;
    height: 100px;
    background: green;
    float: left;
}
View Code

3.static

left与right没有

4.fixed

类似于absoute但是包含块是视窗本身body

只认body

 

posted @ 2019-05-23 11:45  Hello_World2020  阅读(156)  评论(0)  编辑  收藏  举报