Html5之title吸顶功能Html5导航栏吸顶方案原理与对比实现css实现5种滚动吸顶实现方式的比较(性能升级版)纯CSS解决H5布局中的吸顶吸底的实现步骤

 if (fixedDom[0].offsetTop - elementScrollTop < 0){ fixedDom.addClass("road-tab-fixed") }else { fixedDom.removeClass("road-tab-fixed") }

 if(beforeElementScrollTop - elementScrollTop <=0){//up console.log('up'); if (beforeOffsetTop - elementScrollTop < 0){ fixedDom.addClass("road-tab-fixed") } }else{ console.log('down'); // console.log('beforeOffsetTop-----------',beforeOffsetTop); // console.log('elementScrollTop--------------',elementScrollTop); if (beforeOffsetTop - elementScrollTop >= 0){ fixedDom.removeClass("road-tab-fixed") } }

 const fixedDom = $("#road-tab"), isIos = utils.getMobileType(), tabclass = "road-tab-fixed"; let beforeElementScrollTop = 0; let beforeOffsetTop = fixedDom[0].offsetTop; //scroll节流 const throttle = (func,wait,mustRun) => { var timeout, startTime = new Date(); return function() { var context = this, args = arguments, curTime = new Date() clearTimeout(timeout) // 如果达到了规定的触发时间间隔，触发 handler if(curTime - startTime >= mustRun){ beforeElementScrollTop = document.body.scrollTop; console.log("beforelementScrollTop----------",document.body.scrollTop); func.apply(context,args); startTime = curTime // 没达到触发间隔，重新设定定时器 }else{ timeout = setTimeout(func, wait) } } } const winScroll = (e) => { const elementScrollTop=document.body.scrollTop; console.log('elementScrollTop--------------',elementScrollTop); if(beforeElementScrollTop - elementScrollTop <=0){//up console.log('up'); if (beforeOffsetTop - elementScrollTop < 0){ fixedDom.addClass("road-tab-fixed") } }else{ if (beforeOffsetTop - elementScrollTop >= 0){console.log("UUUUUU"); fixedDom.removeClass("road-tab-fixed") } } }; $(window).off("scroll").on("scroll", throttle(winScroll,10,100));