js 操作cookie

var existence = document.cookie.indexOf(‘ticket=‘); 

　　if(existence > -1){//存在
　　} else if(existence  == -1){　　//不存在
     }

kk_main.setCooKie = function(name,value,expiredays){
		var doMain = kk_main.WEB_URL.substring(kk_main.WEB_URL.indexOf(‘.‘));
		var exp = new Date();
		exp.setTime(exp.getTime() + expiredays*24*60*60*1000);
		document.cookie = name + "="+ value + ";expires=" + exp.toGMTString()+";path=/;Domain="+ doMain;
	}

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