The use of the JavaScript method call () and apply ()

first on the code :

Example of the Apply () method

/*Define a human*/  functionPerson (name,age) { This. name=name;  This. age=Age ; }  /*define a student class*/  functionStudent (name,age,grade) {person.apply ( This, arguments);//arguments namely ["Zhangsan", 21, "first Grade"]     This. grade=grade; }  //create an instance of a student classvarStudent=NewStudent ("Zhangsan", 21, "first Grade")); //TestConsole.log ("Name:" +student.name+ "\ n" + "Age:" +student.age+ "\ n" + "Grade:" +Student.grade); /*result output: Name:zhangsan age:21 Grade: First grade*/

Call () Method Example-1:

/*Define a human*/  functionPerson (name,age) { This. name=name;  This. age=Age ; }  /*define a student class*/  functionStudent (name,age,grade) {Person.call ( This, Name,age);  This. grade=grade; }  //create an instance of a student classvarStudent=NewStudent ("Zhangsan", 21, "first Grade")); //TestConsole.log ("Name:" +student.name+ "\ n" + "Age:" +student.age+ "\ n" + "Grade:" +Student.grade); /*result output: Name:zhangsan age:21 Grade: First grade*/

Call () Method Example-2:

/*Define a human*/  functionPerson (name,age) { This. name=name;  This. age=Age ; }  /*define a student class*/  functionStudent (name,age,grade) {Person.call ( This, name);  This. grade=grade; }  //create an instance of a student classvarStudent=NewStudent ("Zhangsan", 21, "first Grade")); //TestConsole.log ("Name:" +student.name+ "\ n" + "Age:" +student.age+ "\ n" + "Grade:" +Student.grade); /*result output: Name:zhangsan age:undefined Grade: First grade*/

The use of the JavaScript method call () and apply ()