问有没有ASP.NET的案例呢？或者类似七牛的qrsync命令行工具。...？

不需要特别使用jQuery来操作cookie。

从QuirksMode（包括转义字符）

function createCookie(name, value, days) {

    var expires;

    if (days) {

        var date = new Date();

        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));

        expires = "; expires=" + date.toGMTString();

    } else {

        expires = "";

    }

    document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + expires + "; path=/";

}

function readCookie(name) {

    var nameEQ = encodeURIComponent(name) + "=";

    var ca = document.cookie.split(';');

    for (var i = 0; i < ca.length; i++) {

        var c = ca[i];

        while (c.charAt(0) === ' ') c = c.substring(1, c.length);

        if (c.indexOf(nameEQ) === 0) return decodeURIComponent(c.substring(nameEQ.length, c.length));

    }

    return null;

}

function eraseCookie(name) {

    createCookie(name, "", -1);

}

看插件：

https://github.com/carhartl/jquery-cookie

你可以这样做：

$.cookie("test", 1);

删除：

$.removeCookie("test");

另外，要在Cookie上设置一定天数的超时时间（这里是10）

$.cookie("test", 1, { expires : 10 });

如果省略了expires选项，则cookie成为会话cookie，并在浏览器退出时被删除。

涵盖所有选项：

$.cookie("test", 1, {

expires : 10, //expires in 10 days

path : '/', //The value of the path attribute of the cookie

//(default: path of page that created the cookie).

domain : 'jquery.com', //The value of the domain attribute of the cookie

//(default: domain of page that created the cookie).

secure : true //If set to true the secure attribute of the cookie

//will be set and the cookie transmission will

//require a secure protocol (defaults to false).

});

要读回cookie的值：

var cookieValue = $.cookie("test");

如果cookie是在与当前路径不同的路径上创建的，则可能希望指定路径参数：

var cookieValue = $.cookie("test", { path: '/foo' });