JS - How to define a Javascript Class

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<script>

 function minivileClass(){ 

   // # Variables
    this.message = "Welcome on the amazing JS world !";
    this.cards = [
     {number:"1",colorRule:"blue",actionRule:"+1piece",label:"Champs de ble",price:"1"},
     {number:"2-3",colorRule:"green",actionRule:"+1piece",label:"Boulangerie",price:"1"},
     {number:"3",colorRule:"red",actionRule:"-1pieceToCurrentPlayer",label:"Cafe",price:"2"},
     {number:"5",colorRule:"blue",actionRule:"+1piece",label:"Foret",price:"3"},
     {number:"6",colorRule:"violet",actionRule:"+2piecesFromOtherPlayers",label:"Stade",price:"6"}
    ];
   // # Variables

   // # Constructor
   if(typeof minivileClass.initialized == "undefined"){ 
        
        // # Functions
        minivileClass.prototype.newGame = function(){ 
          alert(this.message);
        };
        minivileClass.prototype.updateHtml = function(){ 
           for (var i in this.cards)
               document.getElementById("allCards").innerHTML = 
               document.getElementById("allCards").innerHTML + ''+this.cards[i]['number']+" "+this.cards[i]['label']+"";
        };
        // # Functions

   minivileClass.initialized = true; 
   }
   // # Constructor	

} 

window.onload = function(){
    var game = new minivileClass(); 
    game.newGame();
    game.updateHtml();
}

</script>

<body>
    <fieldset><legend>Available cards</legend>
         <spa n id="allCards"></spa n>
    </fieldset>
</body>
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