<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>原型链</title> </head> <body> <script> function Star(name,age) { this.name =name; this.age =age; } Star.prototype.sing = function () { console.log('我会唱歌') } var ldh = new Star('马云',18); // 1.只有是对象就要__proto__原型,指向原型对象 console.log( Star.prototype) console.log( Star.prototype.__proto__ === Object.prototype) // 2. Star原型对象里面的__proto__原型指向的是Object.prototype console.log(Object.prototype.__proto__) //3.我们 Object.prototype原型对象里面的__proto__原型 指向为null </script> </body> </html>
运行结果
