<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id="demo" onclick="gagadan()"></button>
<p id="demo2"></p>
<script>
const gaga = ["1", "2", "3", "4", "5", "6", "7", "8", "9"];
function gagadan(arr) {
let len = arr.length;
let b = 7;
let text = "<ul>";
for (let i = 0; i < len; i++) {
if (b * gaga[i] == 49) {
text += "<li>" +"7*7은 예외사항입니다." + "</li>";
}
text += "<li>" + b + " * " + gaga[i] + "=" + b * gaga[i] + "</li>";
}
return text += "</ul>";
}
document.getElementById("demo").outerHTML = gagadan(gaga);
</script>
</body>
</html>