Javascripts cookie

จาก WikiBall

อันนี้เป็น javascript object เกี่ยวกับ cookie ที่ไปรวบรวมมาจาก web อื่นแล้วนำมาเขียนรวมไว้

function jscookie(){
  this.get_offset_time = function(offset_str, factor)
  {
    if (factor == null) factor=1;

    var regs = null;
    var regex = new RegExp('^([0-9]+)\s*([smhdwnou])','i');
    regs = regex.exec(offset_str);

    if ( regs != null )
    {
      var amount = parseInt(regs[1]);
      var unit   = regs[2].toLowerCase();
    }
    else
    {
      var amount = parseInt(offset_str);
      var $unit  = 's';
    }

    var dt = new Date();
    var ts = dt.getTime();

    switch (unit)
    {
      case 'o':
      	ts = this.get_offset_time('30d', factor);
	break;
      case 'w':
        amount *= 7;
      case 'd':
        amount *= 24;
      case 'h':
        amount *= 60;
      case 'm':
        amount *= 60;
      case 's':
        amount *= 1000;
      case 'u':
        ts += amount * factor;
    }

    dt.setTime(ts);
    return dt.toGMTString();
  }

  this.create = function(name,value,time) {
    if (time) {
      var expires = "; expires="+this.get_offset_time(time);
    }
    else
      var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
  }

  this.read = function(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
      var c = ca[i];
      while (c.charAt(0)==' ') c = c.substring(1,c.length);
      if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
  }

  this.erase = function(name) {
    this.create(name,"",-1);
  }
}

ตัวอย่างการใช้งาน

var cook = new jscookie();
cook.create('memoball','1234','1h');
alert(cook.read('memoball'));