How to use prototype in javascript to complete single inheritance _ javascript

This article mainly introduces how to use prototype to complete single inheritance and sample code in javascript. For more information about how to use prototype to complete single inheritance, See section 1. use prototype to complete single inheritance.

The code is as follows:

// Define A Class
Function (){
}
// For Class A Dynamic Call attribute color, and method sayColor
A. prototype. color = "blue ";
A. prototype. sayColor = function (){
Alert (this. color );
};
// Creates a class B
Function B (){
}
// Let B inherit from
B. prototype = new A (); // new refers to the prototype assigned by A to B. B contains all the attributes and methods defined in.
// Can I rewrite the inherited sayColor.
B. prototype. sayColor = function (){
Alert ("override ");
}
Var B = new B ();
B. color = 'red ';
B. sayColor ();