var $ban=$('#banner'); var sT=document.documentElement.scrollTop; $ban.css('top',0.4*sT+'px'); $ban.css('opacity',0.7-0.7*sT/200); $(document).on('scroll',function () {
var sT=document.documentElement.scrollTop; if(sT<200){ $ban.css('top',0.4*sT+'px'); $ban.css('opacity',0.7-0.7*sT/200); } else { $ban.css('opacity',0); }
}); var $logo=$('#logo'); if(sT<200){
$logo.css('top',0.6*sT-400+'px');
} else {
$logo.css('top','-280px');
} $(document).on('scroll',function () {
var sT=document.documentElement.scrollTop; if(sT<200){ $logo.css('top',0.6*sT-400+'px'); } else { $logo.css('top','-280px'); }
});