只是额外的注释。使用类ES6，当我们创建静态方法时，javacscript引擎设置的描述符属性与老式的“静态”方法略有不同

function Car() {

}

Car.brand = function() {
  console.log('Honda');
}

console.log(
  Object.getOwnPropertyDescriptors(Car)
);

它将brand()的内部属性(描述符属性)设置为

..
brand: [object Object] {
    configurable: true,
    enumerable: true,
    value: ..
    writable: true

}
..

相比

class Car2 {
   static brand() {
     console.log('Honda');
   }
}

console.log(
  Object.getOwnPropertyDescriptors(Car2)
);

将brand()的内部属性设置为

..
brand: [object Object] {
    configurable: true,
    enumerable: false,
    value:..
    writable: true
  }

..

在ES6中static method的enumerable设置为false。

这意味着你不能使用for-in循环来检查对象

for (let prop in Car) {
  console.log(prop); // brand
}

for (let prop in Car2) {
  console.log(prop); // nothing here
}

静态方法在ES6中被视为其他类的私有属性(名称，长度，构造函数)，除了静态方法仍然是可写的，因此描述符writable被设置为true {writable: true}。这也意味着我们可以推翻它

Car2.brand = function() {
   console.log('Toyota');
};

console.log(
  Car2.brand() // is now changed to toyota
);

如果你必须在ES5中编写静态方法，我找到了一个很棒的教程:

//Constructor
var Person = function (name, age){
//private properties
var priv = {};

//Public properties
this.name = name;
this.age = age;

//Public methods
this.sayHi = function(){
    alert('hello');
}
}


// A static method; this method only 
// exists on the class and doesn't exist  
// on child objects
Person.sayName = function() {
   alert("I am a Person object ;)");  
};

看到@https: / / abdulapopoola.com/2013/03/30/static-and-instance-methods-in-javascript/

静态方法调用是直接在类上进行的，不能在类的实例上调用。静态方法经常用于 创建效用函数

非常清晰的描述

直接取自mozilla.org

Foo需要绑定到你的类 然后当你创建一个新实例时，你可以调用myNewInstance.foo() 如果你导入你的类，你可以调用一个静态方法

另外，现在可以用类和静态来做

'use strict'

class Foo {
 static talk() {
     console.log('talk')
 };

 speak() {
     console.log('speak')
 };

};

将会给

var a = new Foo();
Foo.talk();  // 'talk'
a.talk();    // err 'is not a function'
a.speak();   // 'speak'
Foo.speak(); // err 'is not a function'

Javascript没有实际的类，而是使用一个原型继承系统，其中对象通过原型链从其他对象“继承”。这最好通过代码本身来解释:

function Foo() {}; // creates a new function object Foo.prototype.talk = function () { console.log('hello~\n'); }; // put a new function (object) on the prototype (object) of the Foo function object var a = new Foo; // When foo is created using the new keyword it automatically has a reference // to the prototype property of the Foo function // We can show this with the following code console.log(Object.getPrototypeOf(a) === Foo.prototype); a.talk(); // 'hello~\n' // When the talk method is invoked it will first look on the object a for the talk method, // when this is not present it will look on the prototype of a (i.e. Foo.prototype) // When you want to call // Foo.talk(); // this will not work because you haven't put the talk() property on the Foo // function object. Rather it is located on the prototype property of Foo. // We could make it work like this: Foo.sayhi = function () { console.log('hello there'); }; Foo.sayhi(); // This works now. However it will not be present on the prototype chain // of objects we create out of Foo

我使用命名空间:

var Foo = {
     element: document.getElementById("id-here"),

     Talk: function(message) {
            alert("talking..." + message);
     },

     ChangeElement: function() {
            this.element.style.color = "red";
     }
};

要使用它:

Foo.Talk("Testing");

Or

Foo.ChangeElement();