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button의 onclick 메서드를 활용하자.

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
	<style>	
	</style>
</head>
<body>
<div>
    <textarea id="text_area"></textarea>
    <button onclick="alarm()">입력</button>
</div>
<div>
    <span id="print_span" style="width: 200px; height: 200px"></span>
</div>
<div>

</div>
<script>
    function alarm() {
        document.getElementById('print_span').innerHTML = document.getElementById('text_area').value;
        
    }
</script>
</body>
</html>
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