afrontend/onlyNumberWithoutHangul.html

## onlyNumberWithoutHangul.html
<!doctype html>
<html class="no-js" lang="">

<head>
  <meta charset="utf-8">
  <style type="text/css">
    #app {
      font-family: Avenir, Helvetica, Arial, sans-serif;
      text-align: center;
      margin-top: 60px;
    }
  </style>
</head>

<body>
  <div id="app">
    <input placeholder="Enter some text"/>
  </div>

  <script>
    const input = document.querySelector('input')
    const onlyNumber = (function(){
      let prevValue = ''
      return function (e) {
        const value = e.target.value
        if (/^[0-9]*$/.test(value)) {
          prevValue = value
          e.target.value = value
        } else {
          e.target.value = prevValue
        }
      }
    })()
    input.addEventListener('input', onlyNumber)
  </script>
</body>

</html>
	<!doctype html>
	<html class="no-js" lang="">

	<head>
	<meta charset="utf-8">
	<style type="text/css">
	#app {
	font-family: Avenir, Helvetica, Arial, sans-serif;
	text-align: center;
	margin-top: 60px;
	}
	</style>
	</head>

	<body>
	<div id="app">
	<input placeholder="Enter some text"/>
	</div>

	<script>
	const input = document.querySelector('input')
	const onlyNumber = (function(){
	let prevValue = ''
	return function (e) {
	const value = e.target.value
	if (/^[0-9]*$/.test(value)) {
	prevValue = value
	e.target.value = value
	} else {
	e.target.value = prevValue
	}
	}
	})()
	input.addEventListener('input', onlyNumber)
	</script>
	</body>

	</html>