position:static(静态定位) 当position属性定义为static时,可以将元素定义为静态位置,所谓静态位置就是各个元素在HTML文档流中应有的位置 podisition定位问题。所以当没有定义position属性时,并不说明该元素没有自己的位置,它会遵循默认显示为静态位置,在静态定位状态下无法通过坐标值(top,left,right,bottom)来改变它的位置。 position:absolute(绝对定位) 当position属性定义为absolute时,元素会脱离文档流,完全不受文档流的影响,根据某个参照物坐标来定位它的位置.当绝对定位元素没有显示的指明top,right,bottom,left定位属性时,它还是暂时未脱离文档流,并受文档流的影响,具有相对定位的特性,但是它在文档流中的位置已经不存在了。如果绝对定位只显示的定位x轴或者Y轴,那它只具备这个方向上的定位能力,另一个方向仍然显示为相对定位的特性。
坐标值: top:表示定位元素顶边外壁到参照物元素顶部内壁的距离 right:表示定位元素右边外壁到参照物元素右侧内壁的距离 left:表示定位元素左边外壁到参照物元素左侧内壁的距离 bottom:表示定位元素底边外壁到参照物元素底部内壁的距离
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