js cookies implement simple statistics of visits_javascript skills

Copy code The code is as follows:

<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("You are the " getCookie("num") "th visit");

/*String.prototype.Trim=function(){
return this.replace(/s(.*)s/,"$1");
}
String.prototype.alert2=function(str){
alert("I am alert2!!! Haha Haha, the actual content is: " str);
}
var aa="";
aa.alert("liugang");*/
</script>