when you write "does not work in Share", do you mean a javaScript web script controller you wrote in Share or the JavaScript console available as an addon for Share? Please note that "space" is a special root object that is only available to scripts executed in the Repository tier and within a content structure context, e.g. a script triggered by a rule, or an action. This object is not available in any web script controller and - although I am only close to a 100 % certain - on-demand scripts executed via the console.
To create folders and move files using JavaScript, you need a script triggered by a rule or action within a specific content context… Please have a look at the wiki section about root objects in JavaScript.
