node报错:UnhandledPromiseRejectionWarning: RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: [object Object]

node报错:UnhandledPromiseRejectionWarning: RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: [object Object]

不要慌，只是你忘记写状态码了

http.createServer((req, res) => {
    //添加响应头处没有写状态码
    res.writeHead(200,{
        'Content-Type': 'text/html;charset=utf8'
    })
    
}).listen(3000, () => {
    console.log('服务器已启动');
})