How to define private methods in javascript

The way JavaScript defines a private method is the function defined in the constructor of the class, which is a private method, and the code is [this.getSalary = function(){return salary;}].

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

How to define private methods in javascript:

Explanation: The function defined in the constructor of the class is a private method; and the function declared with var in the constructor Variables are also equivalent to private variables. (However, there are differences between the concept of private members in strongly typed languages ​​such as C#. For example, they cannot be called in methods other than non-constructors)

Similarly, we can also implement things like set and get Attribute encapsulation

var Person = function(){    
    var salary = 0.0;
 
    this.setSalary = function(value){
        salary = value;
    }
 
    this.getSalary = function(){
        return salary;
    }
}
 
var p = new Person();
 
p.setSalary(1000);
alert(p.getSalary());//返回1000
alert(p.salary);//返回undefined

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