js cookies实现简单统计访问次数

c<script type="text/javascript">  
if(getCookie("num")){  
var nn=parseInt(getCookie("num"));  
setCookie("num",++nn);  
}else{  
setCookie("num",1);  
}  
function getCookie(name){  
var str=document.cookie.split(";");  
for(i=0;i<str.length;i++){  
var str2=str[i].split("=")  
if(str2[0].replace(/\s(.*)\s/,"$1")==name){  
return str2[1];  
}  
}  
}  
function setCookie(name,value){  
var Days=30;  
var exp = new Date();  
exp.setTime(exp.getTime() + Days*24*60*60*1000);  
document.cookie = name + "="+ escape(value) +";expires"+ exp.toGMTString();  
}  
alert("您是第"+getCookie("num")+"次访问");  
 
/*String.prototype.Trim=function(){  
return this.replace(/\s(.*)\s/,"$1");  
}  
String.prototype.alert2=function(str){  
alert("我是alert2！！！哈哈哈哈 实际内容是:"+str);  
}  
var aa="";  
aa.alert("liugang");*/  
</script>