js写入cookie、读取cookie的一种方法，共享一下

写入：

function writeCookie(name,value,day)

{

expire="";

expire=new Date();

expire.setTime(expire.getTime()+day*24*3600*1000);

expire=expire.toGMTString();

document.cookie=name+"="+escape(value)+";expires="+expire;

}

读取：

function readCookie(name)

{

cookieValue="";

search1=name+"=";

if(document.cookie.length>0)

{

offset=document.cookie.indexOf(search1) ;

if(offset!=-1)

{

offset+=search1.length;

end=document.cookie.indexOf(";",offset);

if(end==-1)

end= document.cookie.length;

cookieValue=unescape(document.cookie.substring(offset,end));

}

}

return cookieValue;

}