首页 > 代码库 > js scrollTop到达指定位置!

js scrollTop到达指定位置!

很早之前就想分享这篇心得, 幸之今天能在这里完成, 好了, 话不多说, 进入正题 :

方法主要利用scrolltop值做运动, 用于到达用户指定的位置(如返回顶部把参数target设置为0即可),处理了多种情况如 scrolltop > 目标值 向上运动 ,等4种情况  , 代码及用法贴上, 

goTo = function(target){				var scrollT = document.body.scrollTop|| document.documentElement.scrollTop				if (scrollT >target) {					var timer = setInterval(function(){						var scrollT = document.body.scrollTop|| document.documentElement.scrollTop						var step = Math.floor(-scrollT/6);						document.documentElement.scrollTop = document.body.scrollTop = step + scrollT;						if(scrollT <= target){							document.body.scrollTop = document.documentElement.scrollTop = target;							clearTimeout(timer);						}					},20)				}else if(scrollT == 0){					var timer = setInterval(function(){						var scrollT = document.body.scrollTop|| document.documentElement.scrollTop						var step = Math.floor(300/3*0.7);						document.documentElement.scrollTop = document.body.scrollTop = step + scrollT;						console.log(scrollT)						if(scrollT >= target){							document.body.scrollTop = document.documentElement.scrollTop = target;							clearTimeout(timer);						}					},20)				}else if(scrollT < target){					var timer = setInterval(function(){						var scrollT = document.body.scrollTop|| document.documentElement.scrollTop						var step = Math.floor(scrollT/6);						document.documentElement.scrollTop = document.body.scrollTop = step + scrollT;						if(scrollT >= target){							document.body.scrollTop = document.documentElement.scrollTop = target;							clearTimeout(timer);						}					},20)				}else if(target == scrollT){					return false;				}			}

  用法 function(target) / / 目前唯一target(目标距离number)  ,

on(goPs,‘click‘,function(){ goTo(2450) }); //运动到scrolltop值为2450地位置,下面也一样, 运动到指定的位置 on(goJob,‘click‘,function(){ goTo(3373) })on(goTel,‘click‘,function(){ buffer.goTo(3373) })on(goMe,‘click‘,function(){ buffer.goTo(1539) })on(goHome,‘click‘,function(){ buffer.goTo(0) });on(scrollgoOne,‘click‘,function(){ buffer.goTo(2450) });on(scrollgoPc,‘click‘,function(){ buffer.goTo(2450) });on(scrollJob,‘click‘,function(){ buffer.goTo(3373) });on(scrollMe,‘click‘,function(){ buffer.goTo(1539) });on(goTop,‘click‘,function(){ buffer.goTo(0) })

 

js scrollTop到达指定位置!