JAVASCRIPT- 자바스크립트 제어구조
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조건문 : if, while, do-while
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반복문 : while, for, for-in
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선택문 : else, else if, switch
<!DOCTYPE html>
<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>
</head>
<body>
<script>
var ar = ["hello", "hi", "greeting"];
var ob = {id:1, title:"hello",writeID:"newlec"};
for (var i in ar)
document.write(ar[i]+"<br />");
for (var i in ob)
document.write(ob[i]+"<br />");
</script>
</body>
</html>
값을 순회하는것이아니라 key값을 순회하는것.
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