MEAN/example.html at master · meltedfork/MEAN · GitHub

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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>
</head>
<body>
    <script>
        const MyObjConstructor = function(name) {
        const myPrivateVar = "Hello"; // just to show that it is hard to see this private var easily
        this.name = name; // but you can see the name!
        this.method = function() {
            console.log( "I am a method");
        };
        }
        const obj1 = new MyObjConstructor('object1');
        const obj2 = new MyObjConstructor('object2');
        console.log(obj1);
        obj1.newProperty = "newProperty!";
        obj1.__proto__.anotherProperty = "anotherProperty!";
        console.log(obj1.anotherProperty); // anotherProperty!
        console.log(obj1.newProperty); // newProperty!
        // What about obj2?
        console.log(obj2.newProperty); // undefined
        console.log(obj2.anotherProperty); // anotherProperty! <= THIS IS THE COOL PART!

    </script>
</body>
</html>