window.history.go(-1); //返回上一页

window.history.back(); //返回上一页

//如果要强行刷新的话就是：window.history.back();location.reload();

window.location.go(-1);//刷新上一页

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Javascript 返回上一页:

1. history.go(-1), 返回两个页面: history.go(-2);

2. history.back(). 

3. window.history.forward()返回下一页

4. window.history.go(返回第几页,也可以使用访问过的URL)  

 例:

<a href="javascript:history.go(-1);">向上一页</a> 

response.Write("<script language=javascript>")

response.Write("if(!confirm('完成任务?')){history.back();}")

response.Write("</script>")

response.Write("<script language=javascript>history.go(-1);</script>")

<a href="javascript:history.go(-1);">向上一页</a>

页面跳转:onclick="window.location.href='index.aspx'"

P.S.

小技巧(JS引用JS):

<script type=text/javascript>

<!--

if (typeof SWFObject == "undefined") {

document.write('<scr' + 'ipt type="text/javascript" src="/scripts/swfobject-1.5.js"></scr' + 'ipt>');}

//-->

</script>