react中使用javascript的api

wrrgggsh  于 2021-09-29  发布在  Java
关注(0)|答案(1)|浏览(305)

我试图在我的react中使用api,但似乎无法在我的react前端加载响应。当我在浏览器上查看网络时,我可以看到响应,但它不会显示在网页上。
我的代码在下面,我似乎不知道出了什么问题。

import { useState, useEffect } from "react";
 import axios from "axios";
import "./PrivateScreen.css";

const PrivateScreen = ({ history }) => {
  const [error, setError] = useState("");
  const [privateData, setPrivateData] = useState(null);

   const url = "https://jsonplaceholder.typicode.com/users";

  useEffect(() => {
    if(!localStorage.getItem("authToken")) {
      history.push("/login")
    }

    const fetchPrivateDate = async () => {
      const config = {
        headers: {
          "Content-Type": "application/json",
          Authorization: `Bearer ${localStorage.getItem("authToken")}`,
        },
      };

      try {
        await axios.get(url, config)
        .then(res => {
          setPrivateData(res.data);
        });

      } catch (error) {
        localStorage.removeItem("authToken");
        setError("You are not authorized. Please login");
      }
    };

    fetchPrivateDate();

  }, [history]);

    const logoutHandler = () => {
    localStorage.removeItem("authToken");
    history.push("/login");
  };

  return error ? (
    <span className="error-message">{error}</span>
  ) : (
    <>
      <div style={{ background: "green", color: "white" }}>
       {privateData.name}
      </div>
      <div><p>hello from this side</p></div>
      <button onClick={logoutHandler}>Log Out</button>
    </>
  );
};

export default PrivateScreen;
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
ghhaqwfi

ghhaqwfi1#

首先,你必须改变,而不是
const [privateData, setPrivateData] = useState(null); const [privateData, setPrivateData] = useState([]); 调用数组数据时,我们希望初始化一个空数组
然后,第二,当我们用希望像这样调用的帮助Map方法显示数组数据时,让我知道问题已经解决

{privateData.map((privateDatas) => (
    <div style={{ background: "green", color: "white" }}>
       {privateDatas.name}
    </div>
  ))}

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