返回顶部：

1. <div id="top"></div><a herf="#top">top</a>

   

2. <button class="gotop">top</button>$(".gotop").click(function(){$(document).scrollTop(0);})

3. <div id="top"></div><button class="gotop">top</button>

   var top=document.getElementById('top');

var btn=document.getElementsByClassName('btn')[0];

btn.onclick=function(){

top.scrollIntoView(0)

}

4.<button class="gotop">top</button>

var btn=document.getElementsByClassName('btn')[0];

btn.onclick = function(){

document.body.scrollTop = document.documentElement.scrollTop = 0;

}

返回上一页的html写法：

1. <a href="#" onClick="javascript :history.back(-1);">返回上一页</a>

2. <a href="#" onClick="javascript :history.go(-1);">返回上一页</a>