这里牛郎总结一个关于js的cookie操作，已经封装好，增删改查！代码如下：

function getAllCookie(){

	var allstr = document.cookie;

	return allstr;

}



// 获取指定cookie

function getCookie(c_name){

	if (document.cookie.length>0){

		c_start=document.cookie.indexOf(c_name + "=")

		if (c_start!=-1){ 

			c_start=c_start + c_name.length+1 

			c_end=document.cookie.indexOf(";",c_start)

			if (c_end==-1) c_end=document.cookie.length

			return unescape(document.cookie.substring(c_start,c_end))

		} 

	}

	return ""

}



// 添加cookie

function setCookie(objName,objValue,expiredays){

	var exdate=new Date()

	exdate.setDate(exdate.getDate()+expiredays)

	document.cookie=objName+ "=" +escape(objValue)+ ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());

}



// 删除cookie

function delCookie(objName){

	var date = new Date(); 

	date.setTime(date.getTime() - 10000); 

	document.cookie = objName + "=a; expires=" + date.toGMTString(); 

}