js对cookie的操作方法

commo.js

function setCookie(name, value) {
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
    document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}

function getCookie(name) {
    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
    if (arr = document.cookie.match(reg))
        return unescape(arr[2]);
    else
        return null;
}

function delCookie(name) {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = getCookie(name);
    if (cval != null)
        document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}

function checkCookie() {
    if (getCookie("userName") == null || getCookie("roleName") == null) {
        alert("未登录!");
        window.location.href = "login.jsp";
    }
}

function clearCookie() {
    delCookie("userName");
    delCookie("roleName");
    window.location.href = "login.jsp";
}

实例

setCookie("userName","xxx");

 注：cookie中不能存放一些标点符号，所以使用unescape解码，escape编码，使某些标点符号合法。