小编Avi*_*man的帖子

我正在尝试使用 React Native fetch get 请求从本地托管的 Express API 获取 json。我们的反应本机代码是：

 useEffect(() => {
    fetch("http://localhost:5000/api/listings")
      .then((response) => response.json())
      .then((responseJSON) => {
        console.log(responseJSON);
        setIsLoading(false);
        setListings(responseJSON);
      })
      .catch((error) => console.log(error));
  }, []);

当我们尝试发送请求时，会记录以下错误：

Network request failed
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:30140:19 in <unknown>
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:31129:20 in <unknown>
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:31045:8 in _callTimer
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:31253:8 in Object.callTimers
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:3213:30 in MessageQueue.__callFunction
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:2945:16 in <unknown>
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:3167:12 in MessageQueue.__guard
at http://192.168.1.34:19000/node_modules%5Cexpo%5CAppEntry.bundle?platform=ios&dev=true&hot=false&minify=false:2944:13 in MessageQueue.callFunctionReturnFlushedQueue

当邮递员发送 get 请求时，会显示 json，所以我很困惑出了什么问题。