Question

我写了一些服务器端代码，应该从雅虎获取实时数据，然后在我运行服务器时将其打印到控制台和浏览器，问题是我无法找到功能即从请求块打印到文档。这是我的代码：

var http = require('http');
var request = require('request');
var cheerio = require('cheerio');
var util = require('util');

tempvar = null;
var server = http.createServer(function(req, res) {
    //writing the headers of our response
    res.writeHead(200, {
        'Content-Type': 'text/plain'
    });

    // Variable Deceleration 
    // TODO: move from the global scope
    var ticker = "IBM";
    var yUrl = "http://finance.yahoo.com/q/ks?s=" + ticker;
    var keyStr = new Array();
    testTemp = null;

    //
    // The main call to fetch the data, parse it and work on it.    
    //
    request(yUrl, function(error, response, body) {
        if (!error && response.statusCode == 200) {
            var $ = cheerio.load(body);


            // the keys - We get them from a certain class attribute
            var span = $('.time_rtq_ticker>span');
            stockValue = $(span).text();
            console.log("Stock  - " + ticker + " --> text " + stockValue);
            //res.write("Stock  - " + ticker + " --> text " + stockValue);
            testTemp = stockValue;
// 

-- end of request --
        res.write("Stock value for: " + ticker + " is --> " + testTemp + "\n");
        res.write("12333\n");
        res.write('something\n');

        //printing out back to the client the last line
        res.end('end of demo');

## Heading ##
        }

    }); 

});

server.listen(1400, '127.0.0.1');

这是我在控制台中遇到的错误 Files \ node.js \ node_modules \ YfTemp.js：49＆gt;＆gt ;; SyntaxError：Module._compile中意外的输入结束位于Function.Modul._load的Module.load的Object.Module._extensions..js位于函数.Module.runMain位于node.js的strartup：906：3

Answer 1

Request 异步。您需要将脚本的打印部分放在请求回调块中。否则，到达打印行时尚未定义ticker。

request(yUrl, function(error, response, body) {
     if (!error && response.statusCode == 200) {
        var $ = cheerio.load(body);


        // the keys - We get them from a certain class attribute
        var span = $('.time_rtq_ticker>span');
        stockValue = $(span).text();
        console.log("Stock  - " + ticker + " --> text " + stockValue);
        //res.write("Stock  - " + ticker + " --> text " + stockValue);
        testTemp = stockValue;

        // -- end of request --
        res.write("Stock value for: " + ticker + " is --> " + testTemp + "\n");
        res.write("12333\n");
        res.write('something\n');

        //printing out back to the client the last line
        res.end('end of demo');

     }


});

如何从node.js中的请求块写入（打印）文档

1 个答案: