javascript - POST 请求仅在服务器启动后第二次有效

Question

每次我重新启动服务器时，第一个 post 请求中的数据都会保存在 var prodctNum 中，但整个 var request = http.get 函数会变成 NAN，直到我再次发布为止。

我需要做什么？

//Global Vars
app.use(function(req, res, next) {
    res.locals.priceES = null
    res.locals.lowPrice = null
    res.locals.priceArray = null
    next()
  })
  //Set Static Path
app.use(express.static(path.join(__dirname, '/public')))
app.get('/', function(req, res) {
  res.render('newpage') //change to index
})
var currencyGBP = ""

function getCurrency() {}
getCurrency()
var priceES = ""
var priceArray
app.post('/', function(req, res) {
  var proudctNum = req.body.product
  console.log("Product num is:.. " + proudctNum);
  priceArray = [{
    "ID": 0,
    "price": Math.round(priceES / currencyEUR),
    "country": "ES"
  }, {
    "ID": 6,
    "price": 10,
    "country": "TEST"
  }]
  var url = "API" + proudctNum + "&store=";
  //server rquest
  var request = http.get(url + "RU", function(res) {
    var body = ""
    res.on("data", function(chunk) {
      body += chunk;
    })
    res.on("end", function() {
      var profile = JSON.parse(body);
      priceRU = profile[0].productPrice.current.value;
      //console.log("Russia Price is:.." + priceRU);
    })

  });
  var lowPrice = priceArray.reduce(function(prev, curr) {
    return prev.price < curr.price ? prev : curr;
  });
  //console.log(priceArray[0].price);
  console.log(lowPrice)

  function FINALRENDER() {
    console.log(priceArray)
    res.render('newpage', priceArray)
  }
  setTimeout(FINALRENDER, 5000)
})

html/ejs代码

<form method="POST" action="/">
    <input type="text" name="product" onfocus="this.value=''" value="TEXT" class="formInput">
    <p class="text-faded mb-5"><BR>TEXTEXT </p>
    <input type="submit" class="btn btn-primary btn-xl js-scroll-trigger" href="/" value="TEXT"></a>

Answer 1

你检查一下你的 NodeJS 和 JavaScript 方法是否都是 POST 吗？当我曾经写过 GET 并在另一边写 POST 时，我多次遇到过这个问题;)