📌 parseInt
- 문자를 숫자로 바꿔줌
<script type="text/javascript">
var a ="123";
var b = "456";
document.write("덧셈 : " + (parseInt(a)+parseInt(b))+"<p>");
document.write("덧셈 : " + (a+b));
</script>
마포구 주민
<script type="text/javascript">
var a ="123";
var b = "456";
document.write("덧셈 : " + (parseInt(a)+parseInt(b))+"<p>");
document.write("덧셈 : " + (a+b));
</script>