IMO替代3是***的。但它假设窗口表示全局范围 - 对于浏览器而言是这样，但对于其他JS环境（命令行，Node.js等）则不然。

IMO alternative 3 is best. But it assumes that window represents the global scope - which is true for the browser but not for other JS environments (command line, Node.js, etc.).

以下内容将全面运作：

(function(globals){
  "use strict";
  globals.GLOB = {};
}(this));