JavaScript Write class way of two _js object-oriented

2. Prototype mode

Copy Code code as follows:

/**
* Person class: Defines a human, has a property name, and a GetName method
*/
function person () {}
Person.prototype.name = "Jack";
Person.prototype.getName = function () {return this.name;}

The properties (fields) of the class are hung on the prototype.

Build several objects under test:

Copy Code code as follows:

var p1 = new Person ();
var p2 = new Person ();
Console.log (P1.getname ());//jack
Console.log (P2.getname ());//jack

It can be seen that the output is jack, so the disadvantage of the prototype method is not to construct the object instance through the parameters (generally each object's properties are not the same), the advantage is that all object instances share the GetName method (relative to the constructor method), does not cause memory waste.