node. JS scope

1. Scope

because node.js Functions are automatically encapsulated at execution time , Therefore, user-defined variables or functions are local . To share data with other modules , have access to ：

// expose
module.exports
// Global variables
global
Can be omitted when using global

Such as ：

var username = "liubai";
// module.exports.name = username;
// name = username;
global.name = username;