document.getElementById("num").value;
var str = "t20070521_280870"+"_"+(_num-1)+"."+"htm";
var url = location.href.substring(0,location.href.lastIndexOf("/")+1);
if(_num<=1||_num==null)
location.href = url+"t20070521_280870"+"."+"htm";
else if(_num>countPage)
alert("本文最多"+countPage+"页");
else
location.href = url+str;
}
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