使用js的cookie统计访客量

使用js设置网页访客量
利用 用户每次打开浏览器，打开网站的次数来记数，除非清空浏览器的cookie，否则记录的数据就会一直存在

var caution=false
function setCookie(name,value,expires,path,domain,secure) 
{
 var curCookie=name+"="+escape(value) +
 ((expires)?";expires="+expires.toGMTString() : "") +
 ((path)?"; path=" + path : "") +
 ((domain)? "; domain=" + domain : "") +
 ((secure)?";secure" : "")
 if(!caution||(name + "=" + escape(value)).length <= 4000)
 {
 document.cookie = curCookie
 }
 else if(confirm("Cookie exceeds 4KB and will be cut!"))
 {
 document.cookie = curCookie
 }
}
function getCookie(name) 
{
 var prefix = name + "="
 var cookieStartIndex = document.cookie.indexOf(prefix)
 if (cookieStartIndex == -1)
 {
 return null
 } 
 var cookieEndIndex=document.cookie.indexOf(";",cookieStartIndex+prefix.length)
 if(cookieEndIndex == -1)
 {
 cookieEndIndex = document.cookie.length
 }
 return unescape(document.cookie.substring(cookieStartIndex+prefix.length,cookieEndIndex))
}
function deleteCookie(name, path, domain) 
{
 if(getCookie(name)) 
 {
 document.cookie = name + "=" + 
 ((path) ? "; path=" + path : "") +
 ((domain) ? "; domain=" + domain : "") +
 "; expires=Thu, 01-Jan-70 00:00:01 GMT"
 }
}
function fixDate(date) 
{
 var base=new Date(0)
 var skew=base.getTime()
 if(skew>0)
 {
 date.setTime(date.getTime()-skew)
 } 
}
var now=new Date()
fixDate(now)
now.setTime(now.getTime()+365 * 24 * 60 * 60 * 1000)
var visits = getCookie("counter")
if(!visits)
{
 visits=1;
} 
else
{
 visits=parseInt(visits)+1;
} 
setCookie("counter", visits, now)
//document.writeln(visits)
document.write(" 同一浏览器:" + visits + " ")