...围的块级元素,再进行定位;绝对定位(absolute)是相对于父级元素进行定位,他相当于父级元素的位置是不变的;固定定位(fixed)是相对于电脑屏幕来进行定位的,类似瀑布流网站跟着页面滚动的导航栏。
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解剖CSS布局原理-雅薇-我是程序员网 ... position: absolute; /* 绝对定位 */ position: fixed; /* 固定定位 */ position不为static的属于定位元素。定位元素分为三种:相对定位、绝对定位、固定定位。三种都有top、bottom、left、right、z-index属性,都是基于某个参照物进行定位,不同的是定位参照物不同和文档流不同,以下是各自的特点和用法。 ...
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固定定位是绝对定位的一种特殊情况,即他的包含框永远都是视口。
Fixed positioning is a subcategory of absolute positioning. The only difference is that for a fixed positioned box, the containing block is established by the viewport.
底部配有静音万向轮4个,其中两个带有刹车,能起到固定定位,推拉灵活;
The bottom has 4 silent universal wheels, two of which havebrakes, can play a fixedlocation, push and pull flexibly;
One of the reasons why you would want to segregate things into certain regions is that molecules have to move in order to accomplish these things; molecules have to move from one place to another.
将细胞功能定位于某个固定区域的,另一个原因是,生物大分子需要移动,以完成某些功能,分子从一个地方移动到另一个地方
To get any location in memory, to get to any value of the list, I simply have to say which element do I want to get, I know that these things are stored in a particular size multiply that index by 4, add it to start, and then it's in a constant amount of time I can go to that location and get out the cell.
取得列表中的任何一个值,简单说来,想要取得列表中的任何元素,我知道这些元素存在特定的大小中,把下标乘以4,加到start上,然后定位到内存单元,并取出值就是固定的时间了,好的,如果元素以固定大小存储。
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