# chatRoom

**Repository Path**: geekcjj/chatRoom

## Basic Information

- **Project Name**: chatRoom
- **Description**: 使用socket.io实现的一个实时多人聊天
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 1
- **Created**: 2019-04-26
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

problem1:You are trying to attach socket.io to an express request handler function. Please pass a http.Server instance.
solution: https://stackoverflow.com/questions/25000275/socket-io-error-hooking-into-express-js
var http = require('http');
var express = require('express'),
    app = module.exports.app = express();

var server = http.createServer(app);
var io = require('socket.io').listen(server);  //pass a http.Server instance
server.listen(80);  //listen on port 80

problem2: io.on('connection',function(socket){});--------io.on is not a function
solution: var socket = io.listen(server);
socket.on('connection', function (socket) {
    socket.on('message', function (data) {
        socket.send(data);
    })
});

problem3: express 获取请求体req.body出现空对象
    let data = {
        "name": document.getElementById("name").value,
        "password": document.getElementById("password").value
    }
    console.log(data);
    let xhr = new XMLHttpRequest();
    xhr.open("POST","http://localhost:3000/userRegister",true);
    xhr.onreadystatechange = function () {
        if(xhr.readyState === 4 && xhr.status === 200) {
            alert("注册成功");
        }
        else {
            alert("注册失败");
        }
    }
    xhr.send(JSON.stringify(data));

solution：关键：xhr.setRequestHeader("Content-type","application/json");//缺少则req.body为空
xhr.send(JSON.stringify(data)); 没有json.stringify()则bad request