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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <section class="wrap">
    <div class="button">0</div>
    <div class="button">1</div>
    <div class="button">2</div>
    <div class="button">3</div>
    <div class="button">4</div>
    <div class="button">5</div>
    <div class="button">6</div>
    <div class="button">7</div>
    <div class="button">8</div>
    <div class="button">9</div>
    <div class="button">.</div>
    <div class="button">÷</div>
    <div class="button">×</div>
    <div class="button">+</div>
    <div class="button">-</div>
    <div class="equal">=</div>
    <div class="ac">AC</div>
    <div class="del">⌫</div>
  </section>
</body>
</html>
 
// numbers & operators
let formula = ''
​
document.querySelectorAll('.button').forEach((item) => {
  item.addEventListener('click', function(event){
    formula += event.target.innerText;
    console.log(formula);
  }, false)
})
​
​
// = 
let result;
​
document.querySelector('.equal').addEventListener('click', function(event){
  result = eval(formula);
  console.log(result);
}, false)
​
​
// AC
document.querySelector('.ac').addEventListener('click', function(){
  formula = '';
  result = 0;
  console.log(formula);
}, false)
​
​
// ⌫
document.querySelector('.del').addEventListener('click', function(){
  let toArr = formula.split('');
  toArr.pop();
  formula = toArr.join('');
  console.log(formula);
}, false)
Output

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