简单启动一个node服务

//安装npm i express  --save 
var express = require("express");
var app = express();
/* 读写文件会用*/
var fs = require("fs");
/* node启动服务,vue部署运行dist下面的项目,history 模式默认路由指向会用,否则刷新页面报404*/
var history = require('connect-history-api-fallback');
app.use(history({
    index: 'index.html'
}));
app.use(express.static("./dist"));
/* 接口层面 */
//json提交
app.use(express.json())
// 表单提交的 parse application/x-www-form-urlencoded
// app.use(express.urlencoded({ extended: false }))
//跨域请求头      设置返向代理就不需要他
app.all('*', function(req, res, next) {
    // res.header("Access-Control-Allow-Origin", "*");
    // res.header("Access-Control-Allow-Headers", "content-type");
    // res.header("Access-Control-Allow-Methods", "*");
    res.header("Content-Type", 'text/html; charset=utf-8')
    next();
});
//登录账户
app.post("/login", function(req, res) {
    var info = req.body
    fs.readFile("data/login.json", function(err, data) {
        if(err) {
            res.end(JSON.stringify({
                msg: "1--1",
                str: "服务器繁忙"
            }))
            console.log(err)
        } else {
            var obj = JSON.parse(data.toString())
            var flag = false
            var ses = ""
            var userId = ""
            var price = 0
            for(var i = 0; i < obj.length; i++) {
                if(info.name == obj[i].name) {
                    if(info.pass == obj[i].pass) {
                        flag = true;
                        ses = obj[i].admin
                        price = obj[i].price
                        userId = obj[i].id
                        break
                    } else {
                        res.end(JSON.stringify({
                            msg: 0,
                            str: "密码有误"
                        }))
                    }
                }
            }
            if(flag) {
                res.end(JSON.stringify({
                    msg: 1,
                    user: info.name,
                    ses: ses,
                    price: price,
                    userId,
                    str: "登录成功"
                }))
            } else {
                res.end(JSON.stringify({
                    msg: 0,
                    str: "账户有误"
                }))
            }
        }
    })
})

//获取日志列表
app.get("/logData", function(req, res) {
    fs.readFile("./data/logData.json", function(err, data) {
        if(err) {
            console.log(err)
        } else {
            res.end(JSON.stringify({
                msg: 1,
                data: JSON.parse(data.toString())
            }))
        }

    })
})

app.listen(8011, function() {
    console.log("我爱你")
})