通过JS读、写cookie

//写入cookie

function writeCookie(name, value, hours)

{

  var expire = "";

  if(hours != null)

  {

    expire = new Date((new Date()).getTime() + hours * 3600000);

    expire = "; expires=" + expire.toGMTString();

  }

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

}

 

//读取cookie

//方法 1

function readCookie(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;

}

 

//方法2

function getCookie(name)
{
    var myCookie = document.cookie;
    name += "=";
    var i = 0;
    while (i < myCookie.length)
    {
      var offset = i + name.length;
      if (myCookie.substring(i, offset) == name)
      {
        var endstr = myCookie.indexOf(";", offset);
        if (endstr == -1) endstr = myCookie.length;
          return unescape(myCookie.substring(offset, endstr));
      }
        i = myCookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    return null;
}