为什么setTimeout会屏蔽我的Node.js应用程序？
为什么setTimeout会屏蔽我的Node.js应用程序？
提问于 2016-03-06 18:51:13
以Http服务器的典型节点js为例，我在其中添加了5秒的延迟，以模拟在其他地方发生的一些异步工作：
const http = require('http');
const hostname = '127.0.0.1';
const port = 8080;
http.createServer((req, res) => {
setTimeout(()=>{
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.end('Hello World\n');
},5000);
}).listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});我期望的是，当我打开5个标签时，假设每个标签之间有半秒的延迟，服务器应该或多或少地“响应”每个标签的时间：
t=0s - I open first tab
t=0.5s - I open second tab
t=1s - I open third tab
...
t=5s - First tab stops loading, server has replied
t=5.5s - Second tab stops loading, server has replied
t=6s - Third tab stops loading, server has replied
t=6.5s - Fourth tab stops loading, server has replied
t=7s - Fifth tab stops loading, server has replied然而，我看到的行为如下：
t=0s - I open first tab
t=0.5s - I open second tab
t=1s - I open third tab
...
t=5s - First tab stops loading, server has replied
t=10s - Second tab stops loading, server has replied
t=15s - Third tab stops loading, server has replied
t=20s - Fourth tab stops loading, server has replied
t=25s - Fifth tab stops loading, server has replied好像后续的请求直到第一个请求完成后才开始运行。我是不是漏掉了什么？我认为Node JS的全部要点是能够从单个线程运行异步taks？
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/35825965
复制相关文章
相似问题