crowller superagent cheerio

crowller.ts

import  superagent from 'superagent';
import cheerio from 'cheerio';

interface Course{
  title: string;
  count: number;
}


class Crowller{
  private secret='demo';
  private url = `http://www.dell-lee.com/typescript/demo.html?secret=${this.secret}`;
  private rawHtml='';
  
  async getRawHtml(){
    const result = await superagent.get(this.url)
    //console.log("re", result.text);
    this.getCourseInfo(result.text);
  }
   
  getCourseInfo(html:string){
    const coureInfos: Course[]=[];
    const  $ =cheerio.load(html);
    const courseItems = $('.course-item')
    console.log(courseItems.length);
    courseItems.map((index, element)=> {
       const descs = $(element).find('.course-desc');
       const title = descs.eq(0).text();
       
       const count = parseInt(
         descs
          .eq(1)
          .text()
          .split('：')[1]
       )
       coureInfos.push({title, count})
    })
    console.log('coureInfo', coureInfos);
  }

  constructor(){
    console.log('constuctor');
    this.getRawHtml();
  }
}

const crowller = new Crowller();