// 得到cookie
function getCookie(str) {
	var strCookie = document.cookie;
	var arrCookie = strCookie.split("; ");
	var thevalue = "";
	//遍历cookie数组，处理每个cookie对
	for (var i = 0; i < arrCookie.length; i += 1) {
		var arr = arrCookie[i].split("=");
		//的cookie，并返回它的值
		if (str==arr[0]) {
			thevalue = arr[1];
			break;
		}
	}
	return thevalue;
}
// 设置cookie
function setCookie(cookiename, cookievalue, cookieage) {
	if (!cookieage) {
		cookieage = 60 * 60 * 24 * 365;
	}


	 var the_date = new Date("December 31, 9999"); 
var expiresDate = the_date.toGMTString();
		 

	var tempstr = cookiename + "=" + cookievalue + "; max-age=" + cookieage+";expires="  
 +   expiresDate;
	document.cookie = tempstr;
}