将您的firebase代码更改为此

change your firebase code to this

var cors = require("cors");
completeProfileFn = (req, res) => {
  // Debug
  console.log(req);
  console.log(req.body);
  console.log(req.method);
  console.log("Test: " + userId + ", " + profilePicture + ", " + username);

  // We recover the data
  const userId = req.body.userId; // return "undefined"
  const profilePicture = req.body.profilePicture; // return "undefined"
  const username = req.body.username; // return "undefined"

  // we're checking to see if they've been transferred
  if (!userId || !profilePicture || !username) {
    // At least one of the 3 required data is not completed
    console.error("Error level 1: missing data");
    return res.status(400).send("Error: missing data");
  }

  // (We have all the data, we continue the function)
};

// CORS and Cloud Functions export logic
exports.completeProfile = functions.https.onRequest((req, res) => {
  var corsFn = cors();
  corsFn(req, res, function() {
    completeProfileFn(req, res);
  });
});

这是一个CORS问题.

It is a CORS issue.