node 新项目模块学习20190211

node 新增模块学习

1. compression--用于请求文件的压缩

var compression = require('compression');  
app.use(compression());  

2.helmet--防护包含点击劫持、xss、嗅探攻击...

https://blog.csdn.net/momDIY/article/details/76944293

var express = require('express')
var helmet = require('helmet')

var app = express();
//使用helmet全部功能
app.use(helmet());
//单独使用某一功能
app.use(helmet.noCache());

3.cors---跨域的问题

//设置跨域访问  
app.all('*', function(req, res, next) {  
    res.header("Access-Control-Allow-Origin", "*");  
    res.header("Access-Control-Allow-Headers", "X-Requested-With");  
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");  
    res.header("X-Powered-By",' 3.2.1')  
    res.header("Content-Type", "application/json;charset=utf-8");  
    next();  
}); 

var cors = require('cors');
app.use(cors({
    origin:['http://localhost:8083'],
    methods:['GET','POST'],
    alloweHeaders:['Conten-Type', 'Authorization']
}));

4.Agenda ---定时任务

https://www.jianshu.com/p/093f92b98ed9