CSS子元素设置margin-top作用于父容器? 原因: In this specification, the expression collapsing margins means that adjoining margins (no non-empty content, padding or border areas or clearance separate them) of two or more boxes (which may be next to one another or n
一.获取css的大小 1.第一种通过内联样式 var box = document.getElementById('box'); var w = box.style.width; var h = box.style.height; 2.通过计算元素的大小(但是在ie情况下有一个问题,那就没写widht和height的css就返回auto); var style = window.getComputedStyle ? window.getComputedStyle(box,null) : null