虚拟机(执行 JavaScript)

\VM (executing JavaScript)

源代码: lib/vm.js

node:vm 模块允许在 V8 虚拟机上下文中编译和运行代码。

\The node:vm module enables compiling and running code within V8 Virtual Machine contexts.

node:vm 模块不是安全机制。不要用它来运行不受信任的代码。

\The node:vm module is not a security mechanism. Do not use it to run untrusted code.

JavaScript 代码可以立即编译并运行,也可以编译、保存并稍后运行。

\JavaScript code can be compiled and run immediately or compiled, saved, and run later.

常见的用例是在不同的 V8 上下文中运行代码。这意味着被调用的代码与调用代码具有不同的全局对象。

\A common use case is to run the code in a different V8 Context. This means invoked code has a different global object than the invoking code.

可以通过 contextifying 对象提供上下文。调用的代码将上下文中的任何属性视为全局变量。由调用的代码引起的对全局变量的任何更改都反映在上下文对象中。

\One can provide the context by contextifying an object. The invoked code treats any property in the context like a global variable. Any changes to global variables caused by the invoked code are reflected in the context object.

const vm = require('node:vm');
const x = 1;
const context = { x: 2 };
vm.createContext(context); // Contextify the object.
const code = 'x += 40; var y = 17;';
// `x` and `y` are global variables in the context.
// Initially, x has the value 2 because that is the value of context.x.
vm.runInContext(code, context);
console.log(context.x); // 42
console.log(context.y); // 17
console.log(x); // 1; y is not defined. 拷贝