関数でdomをクエリしています$(window).scroll
。私はそれが良い習慣だとは思わない。
変数をキャッシュします。javascriptを介したdomへのアクセスは非常に遅くなります。
私はあなたのコードにたくさんのことを持っています、それがあなたを助けるかどうかチェックしてください。
フィドル
$(function(){
var $window = $(window);
var windowHeight = $window.height();
var windowWidth = $window.width();
var content = $("#content");
var section = content.children("section");
var sectionsNumbers = section.length-1;
var illusion = $(".illusion1");
var mask = $('#mask');
// Scroll sets
var windowScrollX = ((sectionsNumbers+1)*windowWidth)-windowWidth;
var windowScrollY = ((sectionsNumbers+1)*windowHeight)-windowHeight;
content.css({"width":windowScrollX+windowWidth,"height":windowScrollY+windowHeight});
illusion .css({"width":windowScrollX+windowWidth,"height":windowScrollY+windowHeight});
// Set mask w and h
mask.css({"width":windowWidth,"height":windowHeight});
$(".scrollRule").css("height", (sectionsNumbers+1)*windowHeight);
section.each(function(sectionCount,val) {
// Defines its width and height
var $this = $(this);
$this.css({"width":windowWidth,"height":windowHeight,"left":sectionCount*windowWidth,"top":sectionCount*windowHeight});
});
// When window scrolls
var angleVar = windowScrollX/windowScrollY;
var curScrollTop;
$(window).scroll(function(){
var $this = $(this);
curScrollTop = $this.scrollTop();
content.stop().animate({left: "-"+curScrollTop*angleVar, top: "-"+curScrollTop}, {duration: 1250, easing: 'easeOutQuart'});
illusion.stop().animate({left: "-"+curScrollTop*angleVar*0.5, top: "-"+curScrollTop*0.5}, {duration: 1250, easing: 'easeOutQuart'});
});
});