script.js

const emojis = ["😍","😍","❤️","❤️","😎","😎","😡","😡","😭","😭","👍","👍","😵","😵","🤩","🤩"];
var shuf_emojis = emojis.sort(() => (Math.random() > .5) ? 2 : -1);
for (let i=0; i<emojis.length; i++){
  let box = document.createElement('div')
  box.className = 'item';
  box.innerHTML = shuf_emojis[i]


  box.onclick = function(){
    this.classList.add('boxOpen')
    setTimeout(function(){
      if(document.querySelectorAll('.boxOpen').length > 1){
        if(document.querySelectorAll('.boxOpen')[0].innerHTML == document.querySelectorAll('.boxOpen'[1]).innerHTML){
          document.querySelectorAll('.boxOpen')[0].classList.add('bocMatch')
          document.querySelectorAll('.boxOpen')[1].classList.add('boxMatch')
          document.querySelectorAll('.boxOpen')[1].classList.remove('boxOpen')
          document.querySelectorAll('.boxOpen')[0].classList.remove('boxOpen')

          if(document.querySelectorAll('.boxMatch').length == emojis.length){
            alert('win')
          }
        } else{
          document.querySelectorAll('.boxOpen')[1].classList.remove('boxOpen')
          document.querySelectorAll('.boxOpen')[0].classList.remove('boxOpen')
        }
      }
    },500)
  }
  document.querySelector('.game').appendChild(box);
}