js 操作Cookie

//写cookies函数

function setCookie(name,value)//两个参数，一个是cookie的名子，一个是值
		{
		    var Days = 30; //此 cookie 将被保存 30 天
		    var exp  = new Date();    //new Date("December 31, 9998");
		    exp.setTime(exp.getTime() + Days*24*60*60*1000);
		    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString()+";path=/webName/";;
		}

//取cookies函数

function getCookie(name)
		{
		    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
		     if(arr != null) return unescape(arr[2]); return null;

		}

//删除cookie

function delCookie(name)
		{
		    var exp = new Date();
		    exp.setTime(exp.getTime() - 1);
		    var cval=getCookie(name);
		    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString()+";path=/webName";;
		}