Javascript 如何将函数/回调传递给Node.js中的子进程?

Javascript 如何将函数/回调传递给Node.js中的子进程?,javascript,node.js,child-process,Javascript,Node.js,Child Process,假设我有一个parent.js包含一个名为parent var childProcess = require('child_process'); var options = { someData: {a:1, b:2, c:3}, asyncFn: function (data, callback) { /*do other async stuff here*/ } }; function Parent(options, callback) { var child =

假设我有一个
parent.js
包含一个名为
parent

var childProcess = require('child_process');

var options = {
    someData: {a:1, b:2, c:3},
    asyncFn: function (data, callback) { /*do other async stuff here*/ }
};

function Parent(options, callback) {
    var child = childProcess.fork('./child');
    child.send({
        method: method,
        options: options
    });
    child.on('message', function(data){
        callback(data,err, data,result);
        child.kill();
    });
}
同时在
child.js中

process.on('message', function(data){
    var method = data.method;
    var options = data.options;
    var someData = options.someData;
    var asyncFn = options.asyncFn; // asyncFn is undefined at here
    asyncFn(someData, function(err, result){
        process.send({
            err: err,
            result: result
        });
    });
});
我想知道Node.js中是否不允许将函数传递给子进程

为什么
asyncFn
在发送到
子项后会变成
未定义的


它是否与JSON有关。stringify

JSON不支持序列化函数(至少是现成的)。您可以先将函数转换为其字符串表示形式(通过
asyncFn.toString()
),然后在子进程中重新创建函数。但问题是这个过程失去了作用域和上下文,所以你的函数必须是独立的

完整示例:

parent.js

var childProcess = require('child_process');

var options = {
  someData: {a:1, b:2, c:3},
  asyncFn: function (data, callback) { /*do other async stuff here*/ }
};
options.asyncFn = options.asyncFn.toString();

function Parent(options, callback) {
  var child = childProcess.fork('./child');
  child.send({
    method: method,
    options: options
  });
  child.on('message', function(data){
    callback(data,err, data,result);
    child.kill();
  });
}
process.on('message', function(data){
  var method = data.method;
  var options = data.options;
  var someData = options.someData;
  var asyncFn = new Function('return ' + options.asyncFn)();
  asyncFn(someData, function(err, result){
    process.send({
      err: err,
      result: result
    });
  });
});
child.js

var childProcess = require('child_process');

var options = {
  someData: {a:1, b:2, c:3},
  asyncFn: function (data, callback) { /*do other async stuff here*/ }
};
options.asyncFn = options.asyncFn.toString();

function Parent(options, callback) {
  var child = childProcess.fork('./child');
  child.send({
    method: method,
    options: options
  });
  child.on('message', function(data){
    callback(data,err, data,result);
    child.kill();
  });
}
process.on('message', function(data){
  var method = data.method;
  var options = data.options;
  var someData = options.someData;
  var asyncFn = new Function('return ' + options.asyncFn)();
  asyncFn(someData, function(err, result){
    process.send({
      err: err,
      result: result
    });
  });
});

啊,比我快:Pis
newfunction('return'+funcString)()
safe for untrusted code?@M4GNV5否,您需要在子进程中使用
vm
模块,并提供适当的操作系统级别保护,以确保“untrusted code”的安全