菲利普·罗伯茨做了精彩的工作,解释的浏览器事件循环这里提供的调用堆栈,事件循环,任务队列,然后在"外"之类webapis线程之间的明确的解释.我的问题是这些与Node事件循环中的等效组件并行,并且它们被称为基本相同的东西.也就是说,当我使用Node的文件和Web i/o库进行调用时,这些是在堆栈外发生的事情,其回调在任务队列中排队？
使用Node.js hello world示例:
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');
我试图找到http.js中的createServer"查找"一个函数然后传递给它的两个对象(上面的名称为'req'和'res'.我通过http.js搜索了我唯一的东西我发现是:
exports.createServer = function(requestListener) {
return new Server(requestListener);
};
这是否意味着匿名功能:
function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}
...作为'requestListener'传递并且......
return new Server(requestListener);
...是req和res对象传回的地方？
我正在从像这样返回xml的api中获取数据:
<?xml version="1.0" encoding="utf-8" ?> <seriess realtime_start="2013-01-28" realtime_end="2013-01-28"> <series id="GDPC1" realtime_start="2013-01-28" realtime_end="2013-01-28" title="Real Gross Domestic Product, 1 Decimal" observation_start="1947-01-01" observation_end="2012-07-01" frequency="Quarterly" frequency_short="Q" units="Billions of Chained 2005 Dollars" units_short="Bil. of Chn. 2005 $" seasonal_adjustment="Seasonally Adjusted Annual Rate" seasonal_adjustment_short="SAAR" last_updated="2012-12-20 08:16:28-06" popularity="93" notes="Real gross domestic product is the inflation adjusted value of the goods and services produced by labor and property located in the United States. For more information see the Guide to the National Income and Product Accounts of the United …我想在视图中显示一些json"美化"的视图用于调试目的.例如,而不是显示:
{"observations"=>{"realtime_start"=>"1776-07-04", "realtime_end"=>"9999-12-31", "observation_start"=>"1776-07-04", "observation_end"=>"9999-12-31", "units"=>"lin", "output_type"=>"1", "file_type"=>"xml", "order_by"=>"observation_date", "sort_order"=>"desc", "count"=>"2541", "offset"=>"0", "limit"=>"10", "observation"=>[{"realtime_start"=>"2013-01-10", "realtime_end"=>"9999-12-31", "date"=>"2012-12-01", "value"=>"1458.750"}, {"realtime_start"=>"2012-12-13", "realtime_end"=>"2012-12-19", "date"=>"2012-11-01", "value"=>"1435.307"}, {"realtime_start"=>"2012-12-20", "realtime_end"=>"2013-01-09", "date"=>"2012-11-01", "value"=>"1435.304"}, {"realtime_start"=>"2013-01-10", "realtime_end"=>"9999-12-31", "date"=>"2012-11-01", "value"=>"1435.303"}, {"realtime_start"=>"2012-11-01", "realtime_end"=>"2012-11-07", "date"=>"2012-10-01", "value"=>"1418.277"}, {"realtime_start"=>"2012-11-08", "realtime_end"=>"2012-11-14", "date"=>"2012-10-01", "value"=>"1418.286"}, {"realtime_start"=>"2012-11-15", "realtime_end"=>"2012-11-22", "date"=>"2012-10-01", "value"=>"1418.285"}, {"realtime_start"=>"2012-11-23", "realtime_end"=>"2012-11-28", "date"=>"2012-10-01", "value"=>"1418.284"}, {"realtime_start"=>"2012-11-29", "realtime_end"=>"9999-12-31", "date"=>"2012-10-01", "value"=>"1418.274"}, {"realtime_start"=>"2012-10-04", "realtime_end"=>"2012-10-10", "date"=>"2012-09-01", "value"=>"1409.636"}]}}
...我想要显示:
{
"observations": {
"realtime_start": "1776-07-04",
"realtime_end": "9999-12-31",
"observation_start": "1776-07-04",
"observation_end": "9999-12-31",
"units": "lin",
"output_type": "1",
"file_type": "xml",
"order_by": "observation_date",
"sort_order": "desc",
"count": "2541",
"offset": "0",
"limit": …