global-variables

问题 I have several 2D and 3D arrays that I'd like to access from multiple places within my app, which will be loaded from SharedPreferences as strings when my app starts and saved back to SharedPreferences whenever onPause() is called on any activity. It's too tedious to pass them between activities with intents or bundles. Is there any way to store data globally in Android? 回答1: What we have done, is used a Globals class that uses mostly static fields and static methods, though not all are

问题 I want to create an array that is accessible to all the .js files. This array must also be updateable, and the updated changes must be reflected in all the other files using that array. I have read that using a GLOBAL variable is not a good method, but what is the alternative? //file 1 which contains my global variable var mySharedArray = ['helo']; module.exports = { mySharedArray: mySharedArray, get: function(){ console.log(mySharedArray); } } //file 2 where i am pushing new-data router.get(

问题 This code: https://github.com/bjornharrtell/jsts/blob/master/index.js refers to a variable named "GLOBAL". When I run this in a browser, I get an error message: "ReferenceError: GLOBAL is not defined" Where does this GLOBAL come from, and why is it not defined? 回答1: In Node.js, GLOBAL is an alias to the global object (more commonly referred to as global ). In browsers, it doesn't exist. Browserify recognizes the global alias, and will inject a reference to window , but does not recognize

问题 I have two view controllers that I am working on which both inherits from a Base view controller class A_ViewController: BaseViewController class B_ViewController: BaseViewController Both of those VC interacts heavily with my firebase database. So I want a variable to keep track of all the downloaded items so those two VC can access it without the need to re-download the file again. I tried to put a variable name in BaseViewController for the two A,B class to access var allPostsDownloaded:

问题 Let's say I want to create a global object called Hello and add the function world on that object, so that any other JavaScript library in the browser can simply call it with window.Hello.world(); How do I create such an object in Dart lang and how do I expose it / place it globally / on the window object? In plain JavaScript, I would be able to write: window.Hello = { world: function() { console.log("Hello World!"); } } window.Hello.world(); But how do you do this in Dart? 回答1: I work on

问题 I'm trying to migrate my code from ES5 to ES6 and use babel . I use the module pattern quite a bit in my code, such that if I have a module like apple I'll do something like this: var appleModule = (function() { var yummy = true; var eat = function() { } return { "eat": eat } })(); and then access appleModule in a different file. However, when moving everything from this: <script type="text/javascript" src="/scripts/apple.js"></script> <script type="text/javascript" src="/scripts/banana.js"><

问题 I want less methods. I want a common global TestClass from which I could use any of its value inside the class. import java.util.*; import java.io.*; public class TestClass { TestClass(String hello){ String hallo = hello; String halloSecond = "Saluto!"; } public static void main(String[] args) { TestClass test = new TestClass("Tjena!"); System.out.println("I want "Tjena!": " + test.hallo); TestClass testSecond = new TestClass("1"); System.out.println("I want Saluto!:" + test.halloSecond);

问题 Usually, defining a variable outside functions is enough to let it be "global". In my case, however, situation seems to be different. var username = null; function myFunction_1() { username="pippo"; myobject.myfunction(function (data){ username="mickey" }) console.log("1: ", username); } myFunction_1(); I expected this code to log "1: mickey". However, if i set the variable inside a callback function logs "1: pippo", that is setting inside the callback gets ignored. What i'm missing? Setting

问题 Ok, this is so weird!!! I am running PHP Version 5.1.6 when I try and run the code below it gives a fatal error of an object that has not been instantiated. As soon as I un-comment this line of code //$cb_db = new cb_db(USER, PASSWORD, NAME, HOST); everything works. Even though I have declared the $cb_db object as global within in the method. Any help would be greatly appreciated. require_once ( ROOT_CB_CLASSES . 'db.php'); $cb_db = new cb_db(USER, PASSWORD, NAME, HOST); class cb_user {

问题 Below is my code global PostgresDatabaseNameSchema global RedShiftSchemaName PostgresDatabaseNameSchema = None RedShiftSchemaName = None def check_assign_global_values(): if not PostgresDatabaseNameSchema: PostgresDatabaseNameSchema = "Superman" if not RedShiftSchemaName: RedShiftSchemaName = "Ironman" check_assign_global_values() But i am getting an error saying Traceback (most recent call last): File "example.py", line 13, in <module> check_assign_global_values() File "example.py", line 8,