{Object} The global namespace object.

In browsers,the top-level scope
is the global scope. That means that in browsers if you’re in the
global scope var something will define a global variable. In Node this
is different. The top-level scope is not the global scope; var
something inside a Node module will be local to that module.

现在我偶然发现了根目录,似乎没有记录.

虽然看起来我可以使用与全局相同的方式：

test1.js

foo = 'bar'; // foo is defined in the global scope (no var in front of foo)

test2.js

require('./test1.js');
console.log(root.foo);

在shell中：

$node test2.js
bar

当我在shell中检查全局和root时,它们看起来一样.尝试：

$node
> global
...
> root
...

所以看起来根与全球是一样的.但为什么冗余？为什么root不记录？是否已弃用？