var express = require('express')
// 创建服务
var app = express()
// 可访问静态资源
app.use('/public', express.static('./public'))
// 处理请求
app.get('/', (req, res) => {
res.send('hello express')
})
// 开启监听
app.listen(3000, () => {
console.log('server is running on port 3000...')
})