jquery实现弹出层完美居中效果

p>jquery实现弹出层完美居中效果

. 代码如下:

showdiv($("#pop"));
function showdiv(obj){
 $(obj).show();
 center(obj);
 $(window).scroll(function(){
  center(obj);
 });
 $(window).resize(function(){
  center(obj);
 });
}

 

function center(obj){
 var windowwidth = document.documentelement.clientwidth;  
 var windowheight = document.documentelement.clientheight;  
 var popupheight = $(obj).height();  
 var popupwidth = $(obj).width();   
 $(obj).css({  
  "position": "absolute",  
  "top": (windowheight-popupheight)/2+$(document).scrolltop(),  
  "left": (windowwidth-popupwidth)/2  
 }); 
}