cookie 的创建 得到 删除

//设置cookie
function setCookie(attr,value,time){
	if(time){
		var newtime=new Date();
		newtime.setTime(newtime.getTime()+time*1000);
		document.cookie=attr+"="+value+";expires="+newtime.toGMTString();
		
	}else{
		document.cookie=attr+"="+value;
	}
}
//获取cookie
function getCookie(attr){
	var cookies=document.cookie;
	var arr=cookies.split("; ");
	for (var i=0;i<arr.length;i++) {
		var brr=arr[i].split("=");
		if(brr[0]==attr){
			return brr[1];
		}	
	}
	return false;
}
//删除cookie
function del(attr){
	var newtime=new Date();
	newtime.setTime(newtime.getTime()-1);
	document.cookie=attr+"=lue;expires="+newtime.toGMTString();
}
//设置cookie
function setCookie(attr,value,ti