Question

我试着寻找这个答案但却找不到任何东西。

在我的node.js索引路由中，我正在创建一个捕获数据并将其发送到视图的http请求。我注意到，当我在浏览器中访问该页面时，视图不会使用最新数据进行更新，只有在我重新保存index.js文件时它才会更新。

index.js

var express = require('express');
var router = express.Router();
var request = require('request');


var url_fx = "https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22EURUSD%2CUSDJPY%2CUSDCAD%2CUSDCHF%2CGBPUSD%2CAUDUSD%2CNZDUSD%2CUSDMXN%2CEURGBP%2C%20EURJPY%22)&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";

var fx_feed;

//console.log(url_fx)
request(url_fx, function(err, resp, body) {
    body = JSON.parse(body);
    fx_feed="";
    if (!body.query.results) {
      fx_feed = "No results found. Try again.";
    } else {
      fx_feed = body.query.results.rate;
      console.log(fx_feed)
      console.log("updated")
    }
})  

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Title', fx:fx_feed });
});

module.exports = router;

为什么我在浏览器中点击页面时没有更新？即使我清除缓存，它也不会更新。

控制台（浏览器请求后）

GET / 304 1256.650 ms - -
GET /stylesheets/style.css 304 7.983 ms - -
GET / 304 87.536 ms - -
GET /stylesheets/style.css 304 3.365 ms - -

控制台（在文本编辑器中保存文件后）

  { id: 'EURJPY',
    Name: 'EUR/JPY',
    Rate: '138.5375',
    Date: '8/21/2015',
    Time: '3:57pm',
    Ask: '138.5450',
    Bid: '138.5300' } ]
updated

Answer 1

您需要将请求放入路线：

var express = require('express');
var router = express.Router();
var request = require('request');


var url_fx = "https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22EURUSD%2CUSDJPY%2CUSDCAD%2CUSDCHF%2CGBPUSD%2CAUDUSD%2CNZDUSD%2CUSDMXN%2CEURGBP%2C%20EURJPY%22)&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";

var fx_feed;

/* GET home page. */
router.get('/', function (req, res, next) {
    request(url_fx, function (err, resp, body) {
        body = JSON.parse(body);
        fx_feed = "";
        if (!body.query.results) {
            fx_feed = "No results found. Try again.";
        } else {
            fx_feed = body.query.results.rate;
            console.log(fx_feed)
            console.log("updated")
        }
        res.render('index', {
            title: 'Title',
            fx: fx_feed
        });
    })

});

module.exports = router;

除非重新保存路由，否则Node.js视图不接收更新的数据

1 个答案: