Node.js基础

冷不防 2021-09-19 23:00 350阅读 0赞

http  
数据请求  
前台->form, ajax, jsonp  
后台

get数据在url中  
post不在url中

![image.png][]

![image.png][image.png 1]

![image.png][image.png 2]

![image.png][image.png 3]

const http = require('http');
    const urlLib = require('url');
    http.createServer(function(req,res){
    var obj = urlLib.parse(req.url, true);
    var url = obj.pathname;
    var GET = obj.query;
    console.log(url, GET);
    // req获取前台请求数据
    res.write('aaa');
    res.end();
    }).listen(8081);

![image.png][image.png 4]

const http=require('http');
    const urlLib = require('url');
    http.createServer(function(req,res){
    var obj = urlLib.parse(req.url, true);
    var url = obj.pathname;
    var GET = obj.query;
    console.log(url,GET);
    // req获取前台请求数据
    res.write('aaa');
    res.end();
    }).listen(8081);

![image.png][image.png 5]

var http=require('http');
    http.createServer(function(req,res){
    }).listen(8080);

![image.png][image.png 6]

![image.png][image.png 7]

(function(){
    var a='hello';
    var b='dashu';
    console.log(a+' '+b);
    })();

var greet = require('./hello');

module.exports vs exports

function da() {
    }
    function shu(name){
    }
    module.exports = {
    da:da,
    shu:shu
    };

exports.hello = hello;
    exports.greet =greet;

![image.png][image.png 8]

![image.png][image.png 9]

var load=function(exports,module) {
     ...
    return module.exports;
    };
    var exported=load(module.exports, module);

![image.png][image.png 10]

![image.png][image.png 11]

输出的是一个函数或数组  
只能给module.exports赋值

输出一个键值对象\{\}

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[image.png]: /images/20210724/1beb048cc4ab4e058c4ac8761e252694.png
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