javascript中的写cookies和读取cookies的代码

<script>
/*写cookie*/
function SetCookie(name ,value)
    {       
      document.cookie= name+ \"=\" +value ;
    }

/*读cookie*/
function getFromCookie(name) {
  var strCookies = document.cookie;
  var cookieName = name + \"=\";
  valueBegin = strCookies.indexOf(cookieName);
  if (valueBegin == -1) return null;
  valueEnd = strCookies.indexOf(\";\", valueBegin);
  if (valueEnd == -1)
      valueEnd = strCookies.length;
  value = strCookies.substring(valueBegin+cookieName.length,valueEnd);
  return value;
}

</script>

/*按键响应*/
function keyEvent()
{
        var val;
        var val = event.keyCode;
        if(!val||val=="undefined")
        {  val = event.which;}
        return keyPress(val);
}
function keyPress(keyval)
{
        if(keyval==133||keyval==269||keyval==119) /*up*/
        {
           if(typeof(Key_Up)!="undefined")
           { return Key_Up();}else{ return 1; }
        }
       
    if(keyval==134||keyval==270||keyval==115) /*down*/
        {
           if(typeof(Key_Down)!="undefined")
           { return Key_Down(); }else{return 1;}
        }
}