无法执行child_process.exec（“node child.js”）

我在名为“app.js”和“child.js”的文件夹下有两个文件。 节点在Windows操作系统上运行。 app.js文件：

;(function() { var http = require("http"), child_process = require("child_process"), exec = child_process.exec; http.createServer(function(request, response) { response.writeHead(200, {"content-type": "text/plain"}); exec('node child.js', {env: {number: 1234}}, function(error, stdout, stderror) { if(error) throw error; console.log(stdout); console.log(stderror); }); response.write("Hello world!!!"); response.end(); }).listen(8000); console.log("The server has started listening to the port: 8000"); })(); 

child.js文件：

 ;(function() { var envVar = process.env.envVar; console.log("Type of envVar: " + typeof envVar); console.log("The value of envVar is: " + parseInt(envVar, 10)); })(); 

我试图通过“exec”方法执行一个外部命令。
但是当我运行：

 node app.js 

我收到错误：

 Command failed: 'node' is not recognized as an internal or external command, operable program or batch file. 

我在这里做什么错了？

Answer 1

所以如果你想exec一个命令，试试这个：

 var http = require("http"), child_process = require("child_process"), exec = child_process.exec; http.createServer(function(request, response) { response.writeHead(200, {"content-type": "text/plain"}); exec( '"' + process.execPath + '" child.js', {env: {number: 1234}}, function(error, stdout, stderror) { if(error) throw error; console.log(stdout); console.log(stderror); }); response.write("Hello world!!!"); response.end(); }).listen(8000); console.log("The server has started listening to the port: 8000"); 

process.execPath包含node.exe的完整path， "应该在那里，因为目录名称可以包含像Program files这样的空格。

subprocess是一样的，我只是把process.env.envVar改为process.env.number ，因为你在exec选项中设置了这个。

 var envVar = process.env.number; console.log("Type of envVar: " + typeof envVar); console.log("The value of envVar is: " + parseInt(envVar, 10));