Question

当我console.log（response.data）时，它是未定义的。为什么会这样？

我已经尝试过res.send和res.json，但是它们都返回undefined ...

我应该在客户端或服务器中进行更改

服务器端

//server js file
app.get("/updateCart", (req, res) => {
    //get items from cart
    dataServiceAuth.findUser("joe")
    .then((user) => {
      res.json(user[0]); //I know user[0] has a value I console.log it to the screen
    })
    .catch((err) => {
      console.log("ERROR. Can't find user")
    });
});

客户端

//client file
$("document").ready(function () {
fetch("/updateCart", {method: "GET"}).then(response => {
    console.log(response.data);
  });
});

Answer 1

app.get('/getItems' (req, res) => {
    let x = [5, 4, 3, 2, 1];
    res.send(x)
})

OR

app.get('/getItems' (req, res) => {
    let x = [5, 4, 3, 2, 1];
    res.json(x)
})

Client.js

var myItems;
fetch("/getItems", method: "GET").then(response => {
  myItems = response.data;
});

将变量从服务器发送到客户端

1 个答案: