页面跳转保留滚动条位置

主要实现逻辑是页面跳转前记录下滚动条坐标到cookies,跳转后回复坐标

.onbeforeunload = () {

   ;
   (.pageYOffset != ) {
       = .pageYOffset;
   }
   (.compatMode != && .compatMode != ) {
       = .documentElement.scrollTop;
   }
   (.body != ) {
       = .body.scrollTop;
   }
   .cookie = + ; }

.onload = () {

   (.cookie.() != ) {
       = .cookie.(); .documentElement.scrollTop = ([]);
       .body.scrollTop = ([]);
   }

}