Hello I'm starting to work with JQuery I have to get the average of three grades, until now I have nothing but the sum of 3 values ... I would like your help to make the average I have looked for examples and I can not do it I leave you the code that I'm using.
<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Funciones jQuery con parámetros</title>
<!-- Bootstrap -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-6">
<h2>Función con 2 parámetros - Suma</h2>
<form>
<div class="form-group">
<label for="valorA">Introduce primer valor</label>
<input type="text" name="valorA" id="valorA" class="form-control"/>
<label for="valorb">Introduce segundo valor</label>
<input type="text" name="valorB" id="valorB" class="form-control"/>
<label for="valorb">Introduce tercer valor</label>
<input type="text" name="valorC" id="valorC" class="form-control"/>
</div>
</form>
<button id="calcula" class="btn btn-default">Calcular</button>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
jQuery(document).ready(function() {
//FUNCIÓN DE SUMA
function operacion(a,b,c){
var resultado=a+b+c;
alert('La suma de '+a+' más '+b+' más '+c+'es igual a ' +resultado);
}
jQuery('#calcula').click(function(){
var num1 = parseInt(jQuery('#valorA').val(),10);
var num2 = parseInt(jQuery('#valorB').val(),10);
var num3 = parseInt(jQuery('#valorC').val(),10);
var promedio;
operacion(num1,num2,num3);
});
});
</script>
</body>
</html>