Node100行实现抓取新浪微博并且发送邮件提醒

<p>Node使用100行代码实现抓取某用户最新内容且发送提醒，主要使用了superagent ，
cheerio，nodemailer，node-schedule四个模块代码如下，修改相关配置信息即可运行。
</p>

let request = require('superagent');
let cheerio = require('cheerio');
let nodemailer = require('nodemailer');
let schedule = require('node-schedule');
//UID获取可在想抓取的新浪微博用户首页查看源代码获得
//修改uid
let reqUrl = 'http://service.weibo.com/widget/widget_blog.php?uid=你要抓取的用户UID数字';
let oldVal;
let newVal;
//邮件服务器配置信息
let transport = nodemailer.createTransport({
//相关邮件服务器配置可在https://nodemailer.com/about/ 查看
    service: 'qq',//qq邮箱
    auth: {
        user: '发件邮箱账户',
        pass: '密码'
    }
});
//邮件发送配置选项
var options = {
    from: '发件邮箱账户',
    to: '目标账户',
    subject: '邮件主题！',
    text: '邮件内容'
};



function requestUrl(url) {

    //获得微博信息
    return request.get(url).then((res) => {
        var $ = cheerio.load(res.text);
        //内容
        var msgcontent = [];
        $('.wgtCell .wgtCell_con').each(function(index, dom) {
            var msg = {};
            msg.inner = $(this).find('.wgtCell_txt').text();
            msg.timer = $(this).find('.wgtCell_tm').text();
            msgcontent.push(msg);

        });


        console.log('最新微博：' + msgcontent[0].inner + ':' + msgcontent[0].timer);
        return msgcontent
    })

};

function tasks(url, ms, to) {
//url 完整请求地址
//ms 每分钟第几秒开始任务
//to 目标邮箱，接受邮件提醒的邮箱地址
    //获取任务启动时初始微博
    requestUrl(url).then(res => { oldVal = res[0].inner });

    //定时任务获取新微博
    schedule.scheduleJob({ second: ms }, () => {

        console.log('任务运行于：' + new Date());

        requestUrl(url).then(res => {
            //获得最新微博并且于初始值比对
            newVal = res[0].inner;
            if (oldVal != newVal) {
                //修改发送邮件配置项
                options.to = to;
                options.text = '你关注人发了微博：' + newVal + '于：' + res[0].timer;
                transport.sendMail(options, function(error, info) {
                    if (error) {
                        console.log('发送失败！' + error)
                    } else {
                        console.log('发送成功！' + to);
                        //发送邮件成功则重置初始微博
                        requestUrl(url).then(res => { oldVal = res[0].inner });
                    }
                })

            } else {
                console.log('微博未更新！')
            }


        });

    })


}

tasks('完整请求地址', '第几秒启动', '目标邮箱')