function loadPage(url) {

    var http = require('http');

    var pm = new Promise(function (resolve, reject) {

        http.get(url, function (res) {

            var html = '';

            res.on('data', function (d) {

                html += d.toString()

            });

            res.on('end', function () {

                resolve(html);

            });

        }).on('error', function (e) {

            reject(e)

        });

    });

    return pm;

}

loadPage('http://www.baidu.com').then(function (d) {

    console.log(d);

});