<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>title</title> <script> function F1(age) { this.age = age; } function F2(age) { this.age = age; } F2.prototype = new F1(10); function F3(age) { this.age = age; } F3.prototype = new F2(20); var f3 = new F3(30); console.log(f3); console.log(f3.age); console.log(f3.__proto__.age); console.log(f3.__proto__.__proto__.age); </script> </head> <body> </body> </html>
