import superagent = require(‘superagent’);
import cheerio = require(‘cheerio’);

class Crowller {
private secret = ‘secretKey’
private url = http://www.dell-lee.com/typescript/demo.html?secret=${this.secret}
getCourseInfo(html: string) {
const $ = cheerio.load(html);
const courseItems = $(’.course-item’);
console.log(courseItems.length)
}

async getRawHtml() {
const result = await superagent.get(this.url)
this.getCourseInfo(result.text)
}
constructor() {
this.getRawHtml();
}
}

const crowller = new Crowller();