js 操作Cookies

/* 设置cookies */
function SetCookie(name,value){
	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();
}
/**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();
}