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一个非常实用的javascript读写Cookie函数

来源 :中华考试网 2020-11-27

  function GetCookieVal(offset)

  //获得Cookie解码后的值

  {

  var endstr = document.cookie.indexOf (";", offset);

  if (endstr == -1)

  endstr = document.cookie.length;

  return unescape(document.cookie.substring(offset, endstr));

  }

  function SetCookie(name, value)

  //设定Cookie值

  {

  var expdate = new Date();

  var argv = SetCookie.arguments;

  var argc = SetCookie.arguments.length;

  var expires = (argc > 2) ? argv[2] : null;

  var path = (argc > 3) ? argv[3] : null;

  var domain = (argc > 4) ? argv[4] : null;

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  var secure = (argc > 5) ? argv[5] : false;

  if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));

  document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))

  +((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))

  +((secure == true) ? "; secure" : "");

  }

  function DelCookie(name)

  //删除Cookie

  {

  var exp = new Date();

  exp.setTime (exp.getTime() - 1);

  var cval = GetCookie (name);

  document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();

  }

  function GetCookie(name)

  //获得Cookie的原始值

  {

  var arg = name + "=";

  var alen = arg.length;

  var clen = document.cookie.length;

  var i = 0;

  while (i < clen)

  {

  var j = i + alen;

  if (document.cookie.substring(i, j) == arg)

  return GetCookieVal (j);

  i = document.cookie.indexOf(" ", i) + 1;

  if (i == 0) break;

  }

  return null;

  }

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