JS-Algorithm/test.html at master · SimonZhangITer/JS-Algorithm · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <title></title>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
    body {
      padding: 100px;
    }

    button {
      font-size: 30px;
      margin: 10px;
      background: none;
      border: 1px solid gray;
    }

    button:active {
      opacity: 0.7;
    }
  </style>
</head>

<body>
  <div class="num" style="font-size:100px">0</div>
</body>
<script>
  var num = document.querySelector('.num')
  for (let i = 1; i <= 10; i++) {
    var doc = document.createElement('button')
    doc.innerHTML = i
    doc.onclick = function () {
      num.innerHTML = i
    }
    document.body.appendChild(doc)
  }

</script>

</html>