node.js - 我如何在nodejs中监听和生成多个子进程

Question

我正在尝试在 for 循环中执行与 nodejs 中的子进程相同的 java jar 文件，但我该如何收听多个子输出？？？

test.jar 文件在无限循环中运行，它所做的只是递增并打印数字。

下面是我的代码，它确实在 nodejs 中生成了多个子进程，但它只打印了最后一个子进程的 pid，其他子进程的内容都添加到最后一个子进程。

var exec = require('child_process').exec, child;
var state = "java -jar " + "c://test.jar "
var exec = require('child_process').exec;

for (var i = 0; i < 10; i++) {

    var child = exec(state);

    // Add the child process to the list for tracking
    p_list.push({process:child, content:""});

    // Listen for any response:
    child.stdout.on('data', function (data) {
        console.log(child.pid, data);
        p_list[i].content += data;
    });

    // Listen for any errors:
    child.stderr.on('data', function (data) {
        console.log(child.pid, data);
        p_list[i].content += data;
    }); 

    // Listen if the process closed
    child.on('close', function(exit_code) {
        console.log('Closed before stop: Closing code: ', exit_code);
    });
}

Answer 1

处理异步进程时需要关闭i。

for (var i = 0; i < 10; i++) {
    (function(i){
        var child = exec(state);

        // Add the child process to the list for tracking
        p_list.push({process:child, content:""});

        // Listen for any response:
        child.stdout.on('data', function (data) {

            console.log(child.pid, data);
            p_list[i].content += data;
        });

        // Listen for any errors:
        child.stderr.on('data', function (data) {
            console.log(child.pid, data);
            p_list[i].content += data;
        }); 

        // Listen if the process closed
        child.on('close', function(exit_code) {
            console.log('Closed before stop: Closing code: ', exit_code);
        });
    })(i)
}