node api child_process

1 初探 child_process

 1.1 fork

• child_process.fork(modulePath, [args], [options])
• • modulePath {String} 子进程中运行的模块
  • args {Array} 字符串参数列表
  • options {Object}
    • cwd {String} 子进程的当前工作目录
    • env {Object} 环境变量键值对
    • encoding {String} 编码（缺省为 'utf8'）
    • execPath {String} 创建子进程的可执行文件
  • 返回：ChildProcess 对象

app.js

/**
 * Created by Administrator on 2015/5/2.
 */
var express = require('express');
var childProcess = require('child_process');
var app = express();

app.get('/', function (req, res) {
    var parentProcess = childProcess.fork('./childProcess.js');
    parentProcess.send({message: 'hello I am father'});
    parentProcess.on('message', function (message) {
        console.log('parent receive message:' + message);
    });
    //setTimeout(function(){
    //    parentProcess.send({message: 'hello I am father'});
    //},5000);
    res.send('hello world');
});

app.listen('3000', function () {
    console.log('server on port 3000');
});

childProcess.js

/**
 * Created by Administrator on 2015/5/2.
 */

//parent process 每一次发消息都会触发
process.on('message', function (message) {
    console.log('child receive message:' + message.message);
    for (var i = 0; i < 10; i++) {
        process.send('hi Iam child');
    }
    process.send('hi Iam child,end');
    setTimeout(function(){
        process.send('hi Iam child,again');
    },5000);
});