JavaScript 화면크기 확인

by JM note

HTML

<body onload="update_screen_size()" onresize="update_screen_size()">
  화면크기
  <span id="width"></span> ×
  <span id="height"></span>
</body>
<script>
  function update_screen_size() {
    document.getElementById('width').innerHTML = window.innerWidth;
    document.getElementById('height').innerHTML = window.innerHeight;
  }
</script>