Node.js在操作簿中的回调示例
[英]Node.js In Action Book callbacks example
问题描述
I am working with the book Node.js in action second edition. 
我正在使用《 Node.js在行动》第二版。 On page 30 there is a callback example where you use display json in html the code I have below is not running and I am not sure why. 在第30页上，有一个回调示例，其中您在HTML中使用display json，我下面的代码未运行，我不确定为什么。 I am running the code below in the proper directory using the command node .\\blog_recent.js but it is not doing anything in the browser when I hit localhost:8000 我正在使用命令节点。\\ blog_recent.js在适当的目录中运行以下代码，但是当我按下localhost：8000时，它在浏览器中没有执行任何操作
NodeJS
const http = require('http');
const fs = require('fs');
http.createServer((req,res) => {
if (req.url == '/') {
fs.readFile('./titles.json', (err, data) => {
if (err) {
console.error(err);
res.end('Server Error');
} else {
const titles = JSON.parse(data.toString());
fs.readFile('./template.html', (err,data) => {
if (err) {
console.error(err);
res.end('Server Error');
} else {
const tmpl = data.toString();
const html = tmpl.replace('%', titles.join('</li><li>'));
res.writeHead(200, { 'Content-Type': 'text/html' });
}
});
}
});
}
}).listen(8000, 'localhost');
Json
[
"Kazakhstan is a huge country.... what goes on there?",
"This weather is making me craaazy",
"My neighbor sort of howls at night"
]
HTML
<!doctype html>
<html>
<head></head>
<body>
<h1>Latest Posts</h1>
<ul><li>%</li></ul>
</body>
</html>
1 个解决方案
解决方案1
1 已采纳 2018-02-08 17:44:17
you are missing res.end(html); 您缺少res.end(html); after res.writeHead(200, { 'Content-Type': 'text/html' }); 在res.writeHead(200, { 'Content-Type': 'text/html' });
not including the res.end means that the server will finish working on the request but won't tell the browser the result, therefor the browser is waiting for a response indefinitely. 不包含res.end意味着服务器将完成请求处理，但不会告诉浏览器结果，因此浏览器将无限期地等待响应。
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