Js _ object-oriented Basics

JavaScript does not have a class, but it is simulated using a function closure (closure). Similar to the class in C #, it is called an object in js.
[Javascript]
1. function Person (name, age) {// declare an object, similar to a class defined in C #
2. this. Name = name; // Name is dynamically defined.
3. this. Age = age;
4. this. SayHello = function (){
5. alert ("Hello, I am" + this. name + ", I" + this. age + "years old ");
6 .}
7 .}
8. var p1 = new Person ("Tomy", 22); // use new. Otherwise, the function is called. The Person does not return a value. If new is not used, p1 is undefined.
9. p1.SayHello ();
10. p1.Sex = "male"; // dynamically add a gender to p1.
11. alert (p1.Sex );

 

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