auto auto 总是试图充满父元素 margin有四个值: All the margin properties can have the following values: auto - the browser calculates the marginlength - specifies a margin in px, pt, cm, etc.% - specifies a margin in % of inherit - specifies that the margin should
使用jquery获取css的top和left属性 因为left和top也都是普通的css属性所以可以使用如下代码来获取 var left = $('#test').css('left'); var top = $('#test').css('top'); 当然这样获取的是一个字符串,如果们想直接取得对象的left和top的像素值,可以通过position方法来获取 var left = $('#test').position().left; var top = $('#test').positi
当没有用 EXISTS 引入子查询时,在选择列表中只能指定一个表达式.比如 select * from T_Employee where FNumber not in ( select top 5* from T_Employee order by FSalary desc)order by FSalary 在sql中执行出现错误 更正:select * from T_Employee where FNumber not in (select top 5 FNumber from T_Em