javascript object-oriented function class

as follows:

Copy the codeThe code is as follows:

 
function Student() 
{ 
//Define the field in the class Student and assign the initial value, but the access permission of this field is public
 = 's001'; 
= 'Xiao Ming';
= 'Male';
//Define the method updateStudentName in class Student to modify the studentName value
 = function(studentName) 
{ 
 = studentName; 
} 
} 

As mentioned above, a Student class has been defined and contains studentNo, studentName,
sex 3 fields, method updateStudentName.
The following will be called, the code is as follows:

Copy the codeThe code is as follows:

 
var s = new Student(); //Create an object of the student class
alert('Student number:'+);
alert('Name:'+);
alert('Gender:'+);

The student number, name, and gender values are displayed before the updateStudentName method are:
Student ID: s001
Name: Xiao Ming
Gender: Male

Then call updateStudentName to modify the value of studentName, the code is as follows:

Copy the codeThe code is as follows:

 
('Xiaoqiang');
alert('Student number:'+);
alert('Name:'+);
alert('Gender:'+);

When the results are displayed, the student number and gender will naturally not change, and the results are as follows:
Student ID: s001
Name: Xiaoqiang
Gender: Male