声明javascript对象与var与函数之间有什么区别？ [英] What is the difference between declaring javascript objects with var vs. with function?

问题描述

我是个混乱的新手。我在一个教程中读到了你创建一个JavaScript对象，如下所示：

I'm a confused newbie. I read in a tutorial that you create a javascript object like so:

function myObject() {
    this.myProperty = "a string";
    this.myMethod = function () {
        //Method code
    }
}

然后我在其他地方读过你创建一个对象，如下所示：

Then I read somewhere else that you create an object like so:

var myObject = {
    myProperty: "a string",
    myMethod : function () {
        //Method code
    }
}

两者之间的（非主观）区别是什么？是否有正确的方法和错误的方法？

What is the (non-subjective) difference between the two? Is there an official right way and a wrong way?

推荐答案

两个声明都是正确的，但它们有不同的语义。

Both declarations are correct but they have different semantics.

第一种类型的声明允许您创建对象的实例：

The first type of declaration allows you to create instances of your objects:

var t = new myObject();
// then use t
t.myProperty = "some value";

var otherT = new myObject();
otherT.myProperty = "some other value";

第二个几乎就像一个静态对象：

The second is almost like a static object:

myObject.myProperty = "some value";

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