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                <!DOCTYPE html>
        <title>Cours JavaScript</title>
        <meta charset="utf-8">
        <meta name="viewport"
          content="width=device-width, initial-scale=1, user-scalable=no">
        <link rel="stylesheet" href="cours.css">
        <script src='cours.js' async></script>
        <h1>Titre principal</h1>
        <p>Un paragraphe</p>
        <p id='p1'></p>
        <p id='p2'></p>
        <p id='p3'></p>
        <p id='p4'></p>
        <p id='p5'></p>




                //On déclare deux variables globales
let x = 5;
var y = 10;

//On définit une première fonction qui utilise les variables globales
function portee1(){
    document.getElementById('p1').innerHTML =
    'Depuis portee1() : <br>x = ' + x + '<br>y = ' + y;
//On définit une deuxième fonction qui définit des variables locales
function portee2(){
    let a = 1;
    var b = 2;
    document.getElementById('p2').innerHTML =
    'Depuis portee2() : <br> a = ' + a + '<br>b = ' + b;
//On définit une troisième fonction qui défnit également des variables locales
function portee3(){
    let x = 20;
    var y = 40;
    document.getElementById('p3').innerHTML =
    'Depuis portee3() : <br>x = ' + x + '<br>y = ' + y;

//On pense bien à exécuter nos fonctions !

//On tente d'afficher des variables globales puis locales depuis l'espace global
document.getElementById('p4').innerHTML =
'Depuis l\'espace global : <br>x = ' + x + '<br>y = ' + y;

document.getElementById('p5').innerHTML =
'Depuis l\'espace global : <br>a = ' + a + '<br>b = ' + b;