存cookie
//保存中文信息到Cookie, 要使用UrlEncode编码
var cookie = new HttpCookie("info");
cookie.Value = Server.UrlEncode("中文信息-" + DateTime.Now.ToString());
cookie.Expires = DateTime.Now.AddMinutes(1); //只保留1分钟
Response.SetCookie(cookie);//必须写不然cookie没保存
//过期时间改到5天之前，立即过期，因此也清除此cookie的方法
cookie.Expires = DateTime.Now.AddDays(-5);
取cookie
HttpCookie cookie = Request.Cookies["info"]; //根据名称直接查找cookie、
localStorage
if (!window.localStorage) {
alert("浏览器不支持localstorage");
return false;
}
3中写入方法
（可以不new var storage = window.localStorage;）
//写入a字段
localStorage["a"] = 6;
//写入b字段
localStorage.b = 7;
//写入c字段
localStorage.setItem("c", 8);
简单的例子：
localStorage.setItem(“name”,“panda”);//设置name为panda
localStorage.setItem(“name”,“Jane”);//覆盖之前的值，现在name所对应的值是Jane
localStorage.getItem(“name”);//获取name的值，即Jane
localStorage.removeItem(“name”);//删除name以及name的值
localStorage.clear();//清除localstorage里边所有数据
function forEachKey(callback) {//遍历显示localStorage中的key
for (var i = 0; i < localStorage.length; i++) {
callback(localStorage.key(i));
}
}
