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定位类型有三种 : (1) ( )定位:应该在什么位置就在什么位置。 (2)( )定位:相对于静态定位的位置,进行偏移。此时需要给出相对偏移的数值,比如:left:150px;top:100px; (3)( )定位:将元素相对于已经定位的父元素进行定位,如果父元素没有定位则相对于body进行定位。
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