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<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="main.js"></script>
<script>
window.onload =function(){
var btnPrint = document.getElementById("btn-print");
var add= function(x,y){
return x+y;
};
btnPrint.onclick = function(){
var x= prompt("x값을 입력하세요.",0);
var y= prompt("y값을 입력하세요.",0);
x=parseInt(x);
y=parseInt(y);
btnPrint.value=x+y;
};
}
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<body>
<input type="button" value = "클릭" id="btn-print"/><br/>
<span id = "span1">스팬입니다.</span>
</body>
</html>
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