vue 和 react 中的功能相同，但在 react 中不起作用 [英] Same function in vue and react but doesnt work in react

问题描述

我在 React/Vue 中执行相同的登录功能.它在 VueJS 上运行良好，但当我在 ReactJS 中使用时它不起作用.

Im doing the same login function in React/Vue. It works fine on VueJS but when i use in ReactJS it doesnt work.

Vue 工作正常:

async EnvioLogin() {
  try {
    const response = await axios.post("api/auth/login", {
      email: this.email,
      password: this.password,
    });
    localStorage.setItem("token", response.data.token);
    if (response.status == "200") {
      this.getUsers();
      console.log(response);
      this.$router.push("intermediorotas");
      this.showLogin = false;
    }
  } catch (error) {
    this.showError = true;
    setTimeout(() => {
      this.showError = false;
    }, 2000);
  }
},

},

React 不起作用:

React doesnt working:

    EnvioLogin = async () => {
        try {
          const response = await axios.post("api/auth/login", { email: this.state.email, password: this.state.password });
          localStorage.setItem("token", response.data.token);
          if (response.status === "200") {
            this.getUsers();
            console.log(response);
            this.props.history.push("/app");
          }
        } catch (error) {
          this.setState({ error: "User or Password wrong!" });
          setTimeout(() => {
            this.setState({ error: "" });
          }, 2000);
        }
      };

我在 try{} 和两个变量(电子邮件/密码)中都使用了 console.log 在这两种情况下都到达那里并且在浏览器中没有出现错误..我认为问题出在

I used console.log in both try{} and both variables(email/password) are getting there in both cases and in the browser no errors appears.. I think the problem is in the

    const response = await axios.post("api/auth/login", { email: this.state.email, password: this.state.password });
      localStorage.setItem("token", response.data.token);

getUsers 视图:

getUsers vue:

  methods: {
    async getUsers() {
      const response = await axios.get("api/alunos", {
        headers: {
          Authorization: "Bearer " + localStorage.getItem("token"),
        },
      });

  console.log(response);
},

getUsers 反应:

getUsers React:

  componentDidMount() {
    this.getUsers()
  }

  getUsers = async () => {
    const response = await axios.get("api/alunos", {
      headers: {
        Authorization: "Bearer " + localStorage.getItem("token"),
      },
    });

    console.log(response);
  };

推荐答案

在 js 中，this 在普通函数和箭头函数中表现不同.严格模式和非严格模式也有区别.

In js, this behaves differently in ordinary function and arrow function. And there is also difference between strict mode and non-strict mode.

特别是，箭头函数不绑定到调用者的上下文.如果你的函数/你使用的库实际上依赖于这种行为，它会产生一些非常模糊的错误.

Specially, arrow function don't bind to the caller's context. If your function/the lib you use actually depends on this behaviour, it would create some very obscure bug.

您的 2 个函数的定义不同.第一个是普通函数，第二个是箭头函数.他们也参考了这个.

Your 2 functions are defined differently. The first one is ordinary function and the second one is arrow function. and they also reference this.

您可以先查看this的用法.但是如果没有更多上下文/可重现的代码，就很难理解问题.

You could check on the usage of this first. But it will be hard to understand the problem without more context/reproducible code.

见:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this

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