让一个元素相对于屏幕居中

downup

1. jQuery.fn.center = function () {
   
2.     this.css(“position”,”absolute”);
   
3.     this.css(“top”, ( $(window).height() – this.height() ) / 2+$(window).scrollTop() + “px”);
   
4.     this.css(“left”, ( $(window).width() – this.width() ) / 2+$(window).scrollLeft() + “px”);
   
5.     return this;
   
6. }
   
7. 
   
8. $(element).center();

复制代码