js控制捲軸緩慢滾動到頂部

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<html><head><script type="text/javascript">var currentPosition,timer;function GoTop(){timer=setInterval("runToTop()",1);}function runToTop(){currentPosition=document.documentElement.scrollTop || document.body.scrollTop; currentPosition-=10;if(currentPosition>0){window.scrollTo(0,currentPosition);}else{window.scrollTo(0,0);clearInterval(timer);}}</script><style type="text/css"></style></head><body><div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">飯</div><div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">吃</div><div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">家</div><div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">回</div><div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">你</div><div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">帶</div><div id="back-up" onclick="GoTop()" style="border:1px solid red;height:100px;width:15px;position:fixed;cursor:pointer;right:10px;bottom:30px;">返回頂部</div><script>window.scrollTo(0,document.body.scrollHeight);</script></body></html>

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