javascript - ECMA6 是否取消了使用原型(prototype)语法作为 JavaScript 中的最佳实践？

Question

例子，

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes

JavaScript classes are introduced in ECMAScript 6 and are syntactical sugar over JavaScript's existing prototype-based inheritance. The class syntax is not introducing a new object-oriented inheritance model to JavaScript. JS classes provide a much simpler and clearer syntax to create objects and dealing with inheritance.

这是否意味着我应该停止在我的开发中使用语言术语 prototype ，当 ECMA6 是最终的并且使用新的语法糖像这样制作时。我相信除此之外它们是相同的(来自同一页面):

// unnamed
var Polygon = class {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
};

// named
var Polygon = class Polygon {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
};

另一方面，我看到了这一点，

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Method_definitions

var obj = {
  foo() {},
  bar() {}
};

这一切如何组合在一起？我将如何处理 var myObj？它能像其他语言一样拥有构造函数和方法 foo() 和 bar() 吗？这是允许的吗？

var myObj = class myObj {
 contructor(height, width){
     this.height=height;
     this.width=width;
 },
  foo(this.height) {alert('the height is ' + this.height)},
  bar(this.height, this.width) {
      alert('the width is ' + this.width);
      var something = this.height + 5;
      alert('the height is : ' + something);

  }
};

var determine_something = new myObj(50,60);
determine_something.bar;
determine_something.foo;

(这在我试过的 ECMA6 沙箱中不起作用)

这没有错误，但是 this.height 是未定义的:

var myObj = class {
 contructor(height, width){
     this.height=height;
     this.width=width;
 }
  foo() {
    alert('the height is ' + this.height);
  }

};

var determine_something = new myObj(50,60);
determine_something.foo();

编辑:如果我不使用 prototype，并且我想添加一个新方法，我该如何使用新语法来实现？

Answer 1

这是固定/优化的版本:

class MyObj {
    contructor(height, width){
        this.height = height;
        this.width = width;
    }

    foo() {
        alert(`the height is ${this.height}`)
    }

    bar() {
        alert(`the width is ${this.width}`);
        const something = this.height + 5;
        alert(`the height is : ${something}`);
    }
};

const determine_something = new MyObj(50,60);
determine_something.bar();
determine_something.foo();