javascript - Node 子进程生成 "TypeError: Bad argument TypeError"？

Question

当我用 Node 运行以下代码时:

var command = "/home/myScript.sh";
fs.exists(command, function(exists){
    if(exists)
    {
        var childProcess =  spawn(command, []); //this is line 602
    }
});

我收到这个错误:

[critical error]: TypeError: Bad argument TypeError: Bad argument
    at TypeError (native)
    at ChildProcess.spawn (internal/child_process.js:274:26)
    at exports.spawn (child_process.js:362:9)
    at /home/simulations/GUIServer/Server/SocketServer.js:602:28
    at FSReqWrap.cb [as oncomplete] (fs.js:212:19)
TypeError: Bad argument
    at TypeError (native)
    at ChildProcess.spawn (internal/child_process.js:274:26)
    at exports.spawn (child_process.js:362:9)
    at /home/simulations/GUIServer/Server/SocketServer.js:602:28
    at FSReqWrap.cb [as oncomplete] (fs.js:212:19)

我的版本是:

• Node 版本:v4.2.6
• Express 版本:4.12.0

在 Linux x64 上运行。

文件权限为755:

-rwxr-xr-x 1 root root 2502 2016-12-06 17:12 myScript.sh

我正在以 root 身份运行。

关于什么可能导致此错误的任何想法？奇怪的是我认为它以前是有效的...

Answer 1

这是一个愚蠢的答案...“命令”未定义。原因如下:

我在循环的顶部有 var command，然后我稍后尝试重新定义 command。这不知何故导致 command 未定义。这是我正在做的:

错误

var command = "/home/myScript.sh";
fs.exists(command, function(exists){
    if(exists)
    {
        //"command" here is UNDEFINED!?
        var childProcess =  spawn(command, []);
    }else
    {
        var command = "something new"; //THIS IS WHAT CAUSED THE PROBLEM
    }
});

正确

var command = "/home/myScript.sh";
fs.exists(command, function(exists){
    if(exists)
    {
        var childProcess =  spawn(command, []);
    }else
    {
        command = "something new"; //FIXED
    }
});