javascript - 如果没有 "function"关键字，这个对象方法定义如何工作？

Question

我通过不小心遗漏了function关键字发现了这一点。通常，下面模块中的 foobar 方法将被声明为 foobar: function(arg1) ，但有趣的是，至少在某些浏览器中，以下是有效的，例如Chrome版本44.0.2403.157 m，但在IE 11.0.9600.17959中失败

这怎么可能在任何浏览器中运行？这是 ES6 的某种新功能吗？

var module = {
    foobar(arg1) {
        alert(arg1);
    }
};

module.foobar("Hello World");

Answer 1

How is it possible that this runs at all in any browser? Is is some sort of new ES6 functionality?

Yes .

...

Method definitions

A property of an object can also refer to a function or a getter or setter method.

var o = {
  property: function ([parameters]) {},
  get property() {},
  set property(value) {},
};

In ECMAScript 6, a shorthand notation is available, so that the keyword "function" is no longer necessary.

// Shorthand method names (ES6)
var o = {
  property([parameters]) {},
  get property() {},
  set property(value) {},
  * generator() {}
};

...