js cookie

cookie 就是js里面的文件操作 地位是很重要的
ie 和 firefox存储cookie的位置不同 所以会有两个浏览器一个登录了 另一个不能登录的现象
cookie文件时不能手动修改的
两个域名不能共享cookie
cookie还有个过期时间

对于一个文件来讲 只要能够存取就够了


function getCookie(name)
{
  var cookieValue = "";
  var search = name + "=";
  if(document.cookie.length > 0)
  {
    offset = document.cookie.indexOf(search);
    if (offset != -1)
    {    
      offset += search.length;
      end = document.cookie.indexOf(";", offset);
      if (end == -1) end = document.cookie.length;
      cookieValue = unescape(document.cookie.substring(offset, end))
    }
  }
  return cookieValue;
}

function setCookie(cookieName,cookieValue,DayValue)
{
    var expire = "";
    var day_value=1;
    if(DayValue!=null)
    {
        day_value=DayValue;
    }
    expire = new Date((new Date()).getTime() + day_value * 86400000);
    expire = "; expires=" + expire.toGMTString();
    document.cookie = cookieName + "=" + escape(cookieValue) +";path=/"+ expire;
}

function delCookie(cookieName)
{
    var expire = "";
    expire = new Date((new Date()).getTime() - 1 );
    expire = "; expires=" + expire.toGMTString();
    document.cookie = cookieName + "=" + escape("") +";path=/"+ expire;
    /*path=/*/
}