复制代码代码如下: وظيفة dothis () { var a = document.getElementById ("addyear") ؛ a.style.left = (document.body.clientwidth/2-a.clientwidth/2)+"px" ؛ a.style.top = (document.body.scrolltop+document.body.clientheight/2-a.clientheight/2)+"px" ؛ }
