Node.js- VM - Modul
Beispiel
Führen Sie JavaScript-Code in einer "virtuellen Maschine" aus:
var vm = require('vm');
var myObj = { name: 'John', age: 38 };
vm.createContext(myObj);
vm.runInContext('age += 1;', myObj);
console.log(myObj);
Definition und Verwendung
Das VM-Modul bietet eine Möglichkeit, JavaScript auf einer virtuellen Maschine auszuführen, fast wie eval() in JavaScript.
Syntax
Die Syntax zum Einbinden des VM-Moduls in Ihre Anwendung:
var vm = require('vm');
VM-Eigenschaften und -Methoden
| Method | Description |
|---|---|
| createContext() | Prepares a virtual machine, or sandbox, where you can execute scripts |
| isContext() | Returns true if the specified sandbox has been created by the createContext() method |
| runInContext() | Executes JavaScript code in the specified context, and returns the result |
| runInDebug() | Executes JavaScript inside the debug context |
| runInNewContext() | Executes JavaScript code in a new context, and returns the result |
| runInThisContext() | Executes JavaScript code in the global context, and returns the result |