if(screen.width <= 980){
	let navTop = $(".pull-item-all").offset().top-70;
	let abstractTop = $(".abstract-bg").offset().top-129;
	let speechTop = $(".speech-bg").offset().top-129;
	let teamTop = $(".team-bg").offset().top-129;
	let organizationTop = $(".organization-bg").offset().top-129;
	let memorabiliaTop = $(".memorabilia-bg").offset().top-129;
	$(window).bind("scroll",function(){
		let topScroll=$(this).scrollTop();//当前窗口的滚动距离
		if(topScroll > navTop){
			$(".pull-item-all").addClass("pull-item-fixed")
		}else{
			$(".pull-item-all").removeClass("pull-item-fixed")
		}
		
		if(topScroll > abstractTop){
			$(".pull-item li").removeClass("cur");
			$(".abstract-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop){
			$(".pull-item li").removeClass("cur");
			$(".speech-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop & topScroll > teamTop){
			$(".pull-item li").removeClass("cur");
			$(".team-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop & topScroll > teamTop & topScroll > organizationTop){
			$(".pull-item li").removeClass("cur");
			$(".organization-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop & topScroll > teamTop & topScroll > organizationTop & topScroll > memorabiliaTop){
			$(".pull-item li").removeClass("cur");
			$(".memorabilia-btn").addClass("cur");
		}
	});
}else{
	let navTop = $(".pull-item-all").offset().top-90;
	let abstractTop = $(".abstract-bg").offset().top-149;
	let speechTop = $(".speech-bg").offset().top-149;
	let teamTop = $(".team-bg").offset().top-149;
	let organizationTop = $(".organization-bg").offset().top-149;
	let memorabiliaTop = $(".memorabilia-bg").offset().top-149;
	$(window).bind("scroll",function(){
		let topScroll=$(this).scrollTop();//当前窗口的滚动距离
		if(topScroll > navTop){
			$(".pull-item-all").addClass("pull-item-fixed")
		}else{
			$(".pull-item-all").removeClass("pull-item-fixed")
		}
		if(topScroll > abstractTop){
			$(".pull-item li").removeClass("cur");
			$(".abstract-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop){
			$(".pull-item li").removeClass("cur");
			$(".speech-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop & topScroll > teamTop){
			$(".pull-item li").removeClass("cur");
			$(".team-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop & topScroll > teamTop & topScroll > organizationTop){
			$(".pull-item li").removeClass("cur");
			$(".organization-btn").addClass("cur");
		}
		if(topScroll > abstractTop & topScroll > speechTop & topScroll > teamTop & topScroll > organizationTop & topScroll > memorabiliaTop){
			$(".pull-item li").removeClass("cur");
			$(".memorabilia-btn").addClass("cur");
		}
	});
};