JavaScript 对象问题

发布于 2024-11-05 20:47:31 字数 309 浏览 4 评论 0原文

我是 Javascript 的初学者。我正在查看其他人编写的以下代码：

function MeetingPage()
{
   MeetingPage.colors = new Object();
}

...

var meeting = new MeetingPage();

根据我所看到的，我相信 MeetingPage 函数创建了一个对象，稍后有人在会议中保留该对象。什么是 MeetingPage.colors？ MeetingPage 前缀是某种全局前缀吗？它是某种“this”指针吗？

任何建议将不胜感激。

原文

I'm a beginner w/ Javascript. I'm looking at the following code that someone else wrote:

function MeetingPage()
{
   MeetingPage.colors = new Object();
}

...

var meeting = new MeetingPage();

From what I've seen, I believe that the MeetingPage function creates an object that later someone holds onto in meeting. What is the MeetingPage.colors? Is the MeetingPage prefix some kind of global? Is it a "this" pointer of some kind?

Any suggestions would be appreciated.

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蓝海似她心 2024-11-12 20:47:31

这实际上只是糟糕的代码。 MeetingPage.colors = new Object(); 在 MeetingPage function 上设置一个名为 colors 的属性，即：

function MeetingPage(){ }
MeetingPage.colors = {};

这是完全有效的，因为 JavaScript 中的所有函数都是对象。问题是，如果您有多个会议页面实例：

var meeting1 = new MeetingPage();
var meeting2 = new MeetingPage();

您发布的代码将重置颜色。它应该写为 this.colors = {}，或者应该设置在函数的外部，如我的第一个代码段中所示。

It's actually just bad code. MeetingPage.colors = new Object(); is setting a property called colors on the MeetingPage function, i.e:

function MeetingPage(){ }
MeetingPage.colors = {};

Which is perfectly valid since all functions in JavaScript are objects. The problem is that if you have multiple instances of meeting page:

var meeting1 = new MeetingPage();
var meeting2 = new MeetingPage();

The code you posted will reset colors. It should either should be written as this.colors = {}, or it should be set outside of the function as in my first snippet.

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