<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>js链式操作</title> </head> <body> <script> function A() { this.num = 2 } A.prototype.set = function (num) { this.num = num; return this; //将调用的对象返回就可以继续调用该对象里面的方法和对象了，即链式调用 } A.prototype.get = function () { console.log(this.num); return this; } var B = new A(); B.get().set(6).get(); class Jack { constructor(x) { this.x = x; } get() { console.log(this.x); return this; } set(x) { this.x = x; return this; } } let j = new Jack(1); j.get().set(6).get(); </script> </body> </html>