JS获取Cookie的值

function getCookie(name)

{

    var bikky = document.cookie;

    name += "=";

    var i = 0;

    while (i < bikky.length)

    {

      var offset = i + name.length;

      if (bikky.substring(i, offset) == name)

      {

        var endstr = bikky.indexOf(";", offset);

        if (endstr == -1) endstr = bikky.length;

          return unescape(bikky.substring(offset, endstr));

      }

        i = bikky.indexOf(" ", i) + 1;

        if (i == 0) break;

    }

    return null;

}