Facebook Group Crawling | How to make it ?

Facebook-Group-Scraping.js

/**
## 1 ::Posts on Group :

 open group from this link :https://m.facebook.com/groups/892792400815703

**/

// 1- Get All page Posts :

function Posts() {
  // @example:
  // let posts = new Posts()
  // posts.rowData(posts.getbyId(3))

  this.array = document.getElementsByClassName('story_body_container')

  this.getbyId = function getbyId(i) {
    return this.array[i]
  }

  this.getAll = function() {
    return this.array
  }


  this.rowData = function(object) {
    let text = object.innerText
    let stripted = text.split('\n')

    let username = stripped[0].split('CSE')[0]
    let date = stripped[1] // not formated one
    let post_content = stripped[2]


    return {
      name: username,
      date: date,
      content: post_content]
  }
}


}





// 2 - Auto Scroll and Crawling Posts:

function startCrawling() {
  var scroll = setInterval(function() {
    window.scrollBy(0, 1000); // 1000 or document.body.scrollHeight
  }, 2000);
}

// 3 - Stop Interval
function stopCrawling(scroll) {
  clearInterval(scroll);
}



/**

## 2 :: Crawling Comments on Posts :

How Much Comment on Post :

 1- open post in anthor Tap : https://m.facebook.com/groups/892792400815703?view=permalink&id=2292379994190263&anchor_composer=false&refid=18&_ft_=qid.6729279865617353288%3Amf_story_key.2292379994190263%3Agroup_id.892792400815703%3Atop_level_post_id.2292379994190263%3Atl_objid.2292379994190263%3Acontent_owner_id_new.577340633%3Asrc.22%3Astory_location.6%3Afilter.GroupStoriesByActivityEntQuery&__tn__=%2AW-R

**/

function Comments() {
  // @example:
  // let comments = new Comments()
  // comments.rowData(comments.getbyId(3))

  this.array = document.getElementsByClassName('_2a_i')

  this.getbyId = function getbyId(i) {
    if (typeof this.array[i] == 'undefined') throw ('Where is That index , i cant see it ?')
    return this.array[i]
  }

  this.getAll = function() {
    return this.array
  }

  this.rowData = function(object) {
    let text = object.innerText
    let stripted = text.split('\n')
    let name = stripted[0]
    let content = stripted[1]
    return {
      name: name,
      content: content
    }
  }


}