node   child_process文档

child_process.exec(command[, options][, callback])

• command <string> The command to run, with space-separated arguments.
• options <Object>
  • cwd <string> Current working directory of the child process. Default: null.
  • env <Object> Environment key-value pairs. Default: null.
  • encoding <string> Default: 'utf8'
  • shell <string> Shell to execute the command with. See Shell Requirements and Default Windows Shell. Default: '/bin/sh' on UNIX, process.env.ComSpec on Windows.
  • timeout <number> Default: 0
  • maxBuffer <number> Largest amount of data in bytes allowed on stdout or stderr. If exceeded, the child process is terminated. See caveat at maxBuffer and Unicode. Default: 200 * 1024.
  • killSignal <string> | <integer> Default: 'SIGTERM'
  • uid <number> Sets the user identity of the process (see setuid(2)).
  • gid <number> Sets the group identity of the process (see setgid(2)).
  • windowsHide <boolean> Hide the subprocess console window that would normally be created on Windows systems. Default: false.
• callback <Function> called with the output when process terminates.
  • error <Error>
  • stdout <string> | <Buffer>
  • stderr <string> | <Buffer>

init(list){//得到硬盘分区的数组

            let ths = this;

            let lists = ths.arrayTrim(list);

            return lists;

}

arrayTrim(arr){//数组中各元素的空格去除

            arr.shift();

            arr.forEach(function(item, index){

                arr[index] = item.trim();

            });

            return arr;

}

logicaldisk(){//获取自盘分区的字符串

            var ths = this;

            spawn.exec('wmic logicaldisk get caption', {

                windowsHide: true

            }, function(err, stdout, stderr) {

                if(err || stderr) {

                    console.log("root path open failed" + err + stderr);

                    return;

                }

                let disks = stdout.trim().split('\n');

                ths.init(disks);

            })

}