<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script type="text/javascript"> function Person()//父类 { this.name=null; this.age=0; this.say=function() { console.log(this.name, this.age); } } function Student() { this.score=0; this.study=function() { console.log("day day up"); } } Student.prototype=new Person();//既然总结没有,就去原型里面找,把Person的实例对象赋值给student的原型对象,实例对象有的东西 Student.prototype.constructor=Student;//为了不破坏关系,这样(构造函数) let stu = new Student(); stu.name = "zs"; stu.age = 18; stu.score = 99; stu.say(); stu.study(); </script> </body> </html>
JS继承核心（1）第一种方式
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