var viewheight = $(window).height();
viewheight = Math.ceil(viewheight*0.8);
Math.ceil();将小数转换为整数,
如:12.1--13,12.3----13,12.9---13
var viewheight = $(window).height();
viewheight = Math.ceil(viewheight*0.8);
Math.ceil();将小数转换为整数,
如:12.1--13,12.3----13,12.9---13