Javascript 如何点击链接并保持授权

这就是我在网站上获得授权的方式：

var webpage = require('webpage');
var page = webpage.create();

page.settings = {
    loadImages: false,
    javascriptEnabled: true,
    encoding: "utf8",
    userAgent: 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
};

phantom.cookiesEnabled = true;

page.open("http://www.example.com/profile/Login.aspx", function(status) {
    if (status === "success") {
        page.evaluate(function() {
            document.getElementById("ctl00_ContentPlaceHolder1_tbUsername").value = "admin";
            document.getElementById("ctl00_ContentPlaceHolder1_tbPassword").value = "1234";
            document.getElementById("ctl00_ContentPlaceHolder1_btnLogin").click();
        });
        window.setTimeout(function() {
            console.log(page.url);
            phantom.exit();
        }, 2000);
    }
});

我现在如何跟随链接并保持授权？ 问题是，当我登录并尝试转到另一个页面时，授权被重置，我无法获取数据