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使用this 和prototype，可以實現JavaScript的對象化編程，構建類和執行個體的概念。首先類是對象的抽象，執行個體則是實際的對象，用關鍵字new可以執行個體化對象。
this用於從執行個體本身的程式碼內訪問執行個體，prototype對象用於設定隸屬於類層（class level）的特性和方法，而非隸屬於執行個體的。讓方法可以儲存於類內部，以免執行個體不必要地一直複製程式碼。
以下是一個簡單的實現：
<html>
<head>
<script>
function Person(id, name){
this.id = id;
this.name = name;
}
Person.prototype.showme = function(){
return "id=" + this.id + "; name=" + this.name;
}
function test() {
var p = new Person(1, "jim");
var p2 = new Person(2, "kate");
alert(p.showme() + "\n" +p2.showme());
}
</script>
</head>
<body>
<input type="button" value="test" onclick="test()"/>
</body>
</html>
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