Methods and data value doesn't access to keydown listenner Vue js

i have this code in my mounted function :

 mounted () {
    document.addEventListener('keydown', function (e) {
      switch (e.keyCode) {
        case 37 :
          alert(this.indexPictures)
          break
      }
    })
  }

My data value:

  data: function () {
    return {
      indexPictures: this.index,
    }
  },

My result : undifined

I don't know why but i can't get value in data function and this is the same problem, from methods access. My result : is not a function

Do you have any ideas ? thanks for you help :)

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