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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).on("click", ".add", function() {
$(this).parent().clone(true).insertAfter($(this).parent());
});
$(document).on("click", ".del", function() {
var target = $(this).parent();
if (target.parent().children().length > 1) {
target.remove();
}
});
</script>
</head>
<body>
<form action="http://localhost:3000/grade" method="POST">
<div id="input_pluralBox">
<div id="input_plural">
<input type="text" class="form-control" placeholder="input" name="number">
<input type="button" value="＋" class="add pluralBtn">
<input type="button" value="－" class="del pluralBtn">
</div>
</div>
<input type="submit" value="submit">
</form>
</body>
</html>