1.cookie的格式

Set－Cookie: NAME=VALUE；Expires=DATE；Path=PATH；Domain=DOMAIN_NAME；

2.添加cookie

//添加cookie
function addCookie(objName,objValue,objHours){
	
	var str = objName + "=" + escape(objValue);
	if(objHours>0){
		
		var ms = objHours*3600*1000;
		var date = new Date();	//获取当前事件
		date.setTime(date.getTime()+ms);
		str+=" ;Expires=" + date.toGMTString();
		
	}
	console.log(str);
	document.cookie = str;	//追加了一个cookie

}

3.根据指定的名称获取cookie值

//获取指定名称的cookie的值
function getCookie(objName){
	
	//得到分割的cookie键值对
	console.log(document.cookie);
	var arrStr = document.cookie.split(";");
	console.log(arrStr);
	for(var i=0; i<arrStr.length;i++){
		
		var temp = arrStr[i].split("=");
		console.log(temp);
		
		if(temp[0]==objName){
			
			return unescape(temp[1]);
		}
	}
	
	return "";
	
}

4.删除cookie(通过修改cookie的生存时间)

//删除cookie
function deleteCookie(objName){
	
	var exp = new Date();
	exp.setTime(exp.getTime()-1);
	var cval = getCookie(objName);
	
	if(cval!=null){
		
		document.cookie = objName + "=" +cval+" ;Expires="+exp.toGMTString();
		
	}

}