初次尝试使用nodejs koajs

 

 

 

 

const fs = require('fs');
const path = require('path');
const Koa = require('koa');
const route = require('koa-route');
const static = require('koa-static');
const app = new Koa();

const main = ctx => {
    /**
     * 判断页面请求类型 Accept 返回相应格式内容
     */
    if (ctx.request.accepts('xml')) {
        ctx.response.type = 'xml';
        ctx.response.body = '<data>Hello World</data>';
    } else if (ctx.request.accepts('json')) {
        ctx.response.type = 'json';
        ctx.response.body = { data: 'Hello World' };
    } else if (ctx.request.accepts('html')) {
        ctx.response.type = 'html';
        ctx.response.body = '<p>Hello World</p>';
    } else {
        ctx.response.type = 'text';
        ctx.response.body = 'Hello World';
    }
}
/**
 * 原生路由
 * @param {*} ctx 
 */
const main_1 = ctx => {
    if (ctx.request.path !== '/') {
        ctx.response.type = 'html';
        ctx.response.body = fs.createReadStream('./view/index.html');
    } else {
        ctx.response.body = 'Hello World';
    }
};
// app.use(route);

/**
 * 日志打印-中间件
 * @param {*} ctx 
 * @param {*} next 
 */
const logger = (ctx, next) => {
    console.log(`${Date.now()} ${ctx.request.method} ${ctx.request.url}`);
    next();
};
app.use(logger);
/**
 * koa-route 路由使用
 */
const index = ctx => {
    ctx.response.type = 'html';
    ctx.response.body = fs.createReadStream('./view/index.html');
};
const about = ctx => {
    ctx.response.type = 'html';
    ctx.response.body = fs.createReadStream('./view/about.html');
};
app.use(route.get('/', index));
app.use(route.get('/about', about));
/**
 * 重定向
 */
app.use(route.get('/redirect', about));
/**
 * 静态文件访问
 */
app.use(static(path.join(__dirname)));


app.listen(3000);