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Css fixed和absolute定位区别_html/css_WEB-ITnose

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Release: 2016-06-24 11:38:18
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fixed:固定定位

absolute:绝对定位


区别很简单:

1、没有滚动条的情况下没有差异

2、在有滚动条的情况下,fixed定位不会随滚动条移动而移动,而absolute则会随滚动条移动


可以这么理解,fixed:固定在当前window不动, absolute:会随参照对象元素的高度和宽度变化而变化


一般fixed用在遮盖层和固定在页面某个位置,如固定在顶端的菜单栏,又如弹出提示框居中显示


下面例子可是简单测试两者之间的区别,注意拖动滚动条看差异






   
   


   
fixed定位

   
absolute定位



效果如下:当滚动条下拉时,absolute层会上移,fixed层不动




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