One of javascript object-oriented definition classes

Classes in javascript are represented by function functions, as follows:
Copy codeThe Code is as follows:
Function Student ()
{
// Define the field in the Student class and grant the initial value. However, the access permission for this field is public.
This. studentNo = 's001 ';
This. studentName = 'xiaoming ';
This. sex = 'male ';
// Define the method updateStudentName in the Student class to modify the value of studentName
This. updateStudentName = function (studentName)
{
This. studentName = studentName;
}
}

// The code above defines a Student class and includes studentNo,
// StudentName, sex three fields, method updateStudentName. // then 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 );
// The result is displayed. 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
// Call the following code:
Copy codeThe 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 );

The specific values have been set in the above function. In fact, they are all assigned values in practical applications. For example

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