//创建cookie
function setCookie(name, value, expireday) {
	var exp = new Date();
	exp.setTime(exp.getTime() + expireday*24*60*60*1000); //设置cookie的期限
	document.cookie = name+"="+escape(value)+"; expires"+"="+exp.toGMTString();//创建cookie
}
//提取cookie中的值
function getCookie(name) {
	var cookieStr = document.cookie;
	if(cookieStr.length > 0) {
		var cookieArr = cookieStr.split(";"); //将cookie信息转换成数组
		for (var i=0; i<cookieArr.length; i++) {
			var cookieVal = cookieArr[i].split("="); //将每一组cookie(cookie名和值)也转换成数组
			if(cookieVal[0] == name) {
				return unescape(cookieVal[1]); //返回需要提取的cookie值
			}
		}
	}
}
//测试cookie
function checkCookie() {
	var cookieUser = document.getElementById("cookieUser");
	var userName = getCookie("userName");
	if(userName) {
		cookieUser.innerHTML = "您好"+userName+"，欢迎再次回来！"; 
	} else {
		var value = prompt("请输入用户名", "");
		if(value) {
			setCookie('userName', value, 1);
		} else {
			alert("请输入用户名！");
		}
	}
}



//javascript/5015