script.runInNewContext([contextObject[, options]])
首先对给定的 contextObject
进行上下文隔离化,在创建的上下文中运行 vm.Script
对象包含的编译代码,并返回结果。
运行代码无权访问本地作用域。
contextObject
<Object> An object that will be contextified. Ifundefined
, a new object will be created.options
<Object>displayErrors
<boolean> Whentrue
, if anError
occurs while compiling thecode
, the line of code causing the error is attached to the stack trace. Default:true
.timeout
<integer> Specifies the number of milliseconds to executecode
before terminating execution. If execution is terminated, anError
will be thrown. This value must be a strictly positive integer.breakOnSigint
<boolean> Iftrue
, receivingSIGINT
(Ctrl+C) will terminate execution and throw anError
. Existing handlers for the event that have been attached viaprocess.on('SIGINT')
are disabled during script execution, but continue to work after that. Default:false
.contextName
<string> Human-readable name of the newly created context. Default:'VM Context i'
, wherei
is an ascending numerical index of the created context.contextOrigin
<string> Origin corresponding to the newly created context for display purposes. The origin should be formatted like a URL, but with only the scheme, host, and port (if necessary), like the value of theurl.origin
property of aURL
object. Most notably, this string should omit the trailing slash, as that denotes a path. Default:''
.contextCodeGeneration
<Object>microtaskMode
<string> If set toafterEvaluate
, microtasks (tasks scheduled throughPromise
s andasync function
s) will be run immediately after the script has run. They are included in thetimeout
andbreakOnSigint
scopes in that case.
- Returns: <any> the result of the very last statement executed in the script.
First contextifies the given contextObject
, runs the compiled code contained
by the vm.Script
object within the created context, and returns the result.
Running code does not have access to local scope.
The following example compiles code that sets a global variable, then executes
the code multiple times in different contexts. The globals are set on and
contained within each individual context
.
const vm = require('node:vm');
const script = new vm.Script('globalVar = "set"');
const contexts = [{}, {}, {}];
contexts.forEach((context) => {
script.runInNewContext(context);
});
console.log(contexts);
// Prints: [{ globalVar: 'set' }, { globalVar: 'set' }, { globalVar: 'set' }]