JavaScript全局声明

Question

I've just started out with javascript and came across this line in a file called global.js There is only one line in the file. I'm not sure what does App do. Any ideas?

Filename: globals.js

//The Application 
App = {};

Answer 1

它创建了一个名称为App ...的对象。

Answer 2

I would assume that the idea behind the global.js file in your case is to include the file in your base html/template so that the variables in there can be accessed from anywhere in the app.

In some of our projects, we've had global files like this containing references to collections and "setting" variables, which is quite handy :)

Answer 3

It is creating an object named App in the global namespace. App has no functions or attributes (yet).

Answer 4

It (implicitly) declares a variable called App in a "global" context and assigns an empty object as its value. Assuming this is used on a web page somewhere, it's the same as declaring window.App = {} .

How this affects the rest of your application, we won't know until you post more relevant code.

Answer 5

This script just instantiate this empty Object. Probably, others scripts that ran along with this uses that object and depends that it is created there.