(1) JavaScript object-oriented: (1) Class

 

  Classes in JavaScript are represented by function functions, as follows:
  Function  Student ()
{

  //  Define the field in student class and assign the initial value. However, the access permission for this field is public.  
    This  . Studentno  =     '  S001 '  ;

  This  . Studentname  =     '  James  '  ;

  This  . Sex  =     '  Male  '  ;

 //  Defines the method updatestudentname in the student class, which is used to modify the value of studentname  
    This  . Updatestudentname  =     Function  (Studentname)
{
  This  . Studentname  =  Studentname;
}

}

  // AboveCodeYou have defined a student class and included studentno,    

 // Studentname,  Sex three fields, method updatestudentname.   
   //  Call updatestudentname to modify the value of studentname. The Code is as follows:  
  
S. updatestudentname (  '  Xiaoqiang  ' );

Alert (  '  Student ID:  '  +  S. studentno );

Alert (  '  Name:  '  +  S. studentname );

Alert (  '  Gender:  '  +  S. Sex );

  // Then, the student ID and gender will not change. The result is as follows:  
  
Student ID: s001

Name: Xiaoqiang

Gender: male  
//The student ID, name, and gender values are displayed before the updatestudentname method is called:

Student ID: s001

Name: James

Gender: male   
 //  The Code is as follows:  
  VaR  S =     New  Student ();  //  Create a Student Class Object  
Alert (  '  Student ID:  '  +  S. studentno );
Alert (  '  Name:  '  + S. studentname );
Alert (  '  Gender:  '  +  S. Sex );