在CSS中固定定位的问题

2025-01-10 11:17:10
推荐回答(2个)
回答1:

1、绝对定位 和 固定定位 的元素若没有设置 top/right/left/bottom 的值。其位置为原来在文档流中的位置。其他文档流元素会占据其原来位置。

要使绝对定位或固定定位的元素水平居中,需要设置其 width 为固定值,并且 left: 0; right: 0; 。

2、绝对定位 和 固定定位 的元素,若其宽度 width 或高度 height 的单位为 百分比 ,宽度和高度值是相对于其基于定位的元素计算的。(在使用一些stick插件时尤其要注意这点)。

扩展资料:

CSS技巧 

1、div的垂直居中问题 vertical-align:middle; 将行距增加到和整个DIV一样高 line-height:200px; 然后插入文字,就垂直居中了。缺点是要控制内容不要换行 

2、 margin加倍的问题 设置为float的div在ie下设置的margin会加倍。这是一个ie6都存在的bug。解决方案是在这个div里面加上 display:inline; 例如: <#div id=”imfloat”> 相应的css为 #IamFloat{ float:left; margin:5px;/*IE下理解为10px*/ display:inline;/*IE下再理解为5px*/} 

3、浮动ie产生的双倍距离 #box{ float:left; width:100px; margin:0 0 0 100px; //这种情况之下IE会产生200px的距离 display:inline; //使浮动忽略} 这里细说一下block与inline两个元素:block元素的特点是,总是在新行上开始,高度,宽度,行高,边距都可以控制(块元素)。

参考资料:百度百科 CSS(层叠样式表)_

回答2:

你最好先了解一下css 定位 CSS position 属性 通过使用 position 属性,我们可以选择 4 种不同类型的定位,这会影响元素框生成的方式。 position 属性值的含义: static 元素框正常生成。块级元素生成一个矩形框,作为文档流的一部分,行内元素则会创建一个或多个行框,置于其父元素中。 relative 元素框偏移某个距离。元素仍保持其未定位前的形状,它原本所占的空间仍保留。 absolute 元素框从文档流完全删除,并相对于其包含块定位。包含块可能是文档中的另一个元素或者是初始包含块。元素原先在正常文档流中所占的空间会关闭,就好像元素原来不存在一样。元素定位后生成一个块级框,而不论原来它在正常流中生成何种类型的框。 fixed 元素框的表现类似于将 position 设置为 absolute,不过其包含块是视窗本身。 提示:相对定位实际上被看作普通流定位模型的一部分,因为元素的位置相对于它在普通流中的位置。 更详细内容: http://www.w3school.com.cn/css/css_positioning.asp

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