cookie封装

<script>
			function setCookie(name,value,iDay)
			{
				var oDate = new Date();
				oDate.setDate(oDate.getDate()+iDay)
				document.cookie = name +'='+ value  +';expires='+oDate;
			}
			
			function getCookie(name)
			{
				var arr = document.cookie.split(';');
				for(var i = 0 ; i < arr.length;i++)
				{
					var arr2 =arr[i].split('=');
					if(arr2[0] == name)
					{
						return arr2[1];
					}
				}
				return "";
			}
//			setCookie('username','dancingblue',365)
//			setCookie('password','123',14);
			
//			alert(getCookie('username'));
			
			function removeCookie(name)
			{
				setCookie(name,1,-1);
			}
			removeCookie('username');
			alert(document.cookie);
		</script>