fetch() 中的 Async/Await 如何处理错误

Question

我的 React 应用程序中有条带异步代码，并试图在我的代码中添加错误处理，但不知道如何处理它。我知道如何使用 .then() 但 async/await 对我来说是新的

已编辑

添加了 .catch() 我在响应选项卡中的网络选项卡中出现错误。 但我可以将其记录到控制台？

    submit = async () => {
    const { email, price, name, phone, city, street, country } = this.state;
    let { token } = await this.props.stripe
      .createToken({
        name,
        address_city: city,
        address_line1: street,
        address_country: country
      })
      .catch(err => {
        console.log(err.response.data);
      });

    const data = {
      token: token.id,
      email,
      price,
      name,
      phone,
      city,
      street,
      country
    };

    let response = await fetch("/charge/pay", {
      method: "POST",
      headers: {
        "Content-Type": "application/json"
      },
      body: JSON.stringify(data)
    }).catch(err => {
      console.log(err.response.data);
    });
    console.log(response);
    if (response.ok)
      this.setState({
        complete: true
      });
  };

谢谢

Answer 1

Fetch 仅检测网络错误。其他错误（401、400、500）应手动捕获并拒绝。

await fetch("/charge/pay", headers).then((response) => {
    if (response.status >= 400 && response.status < 600) {
      throw new Error("Bad response from server");
    }
    return response;
}).then((returnedResponse) => {
   // Your response to manipulate
   this.setState({
     complete: true
   });
}).catch((error) => {
  // Your error is here!
  console.log(error)
});

如果您不习惯这种 fetch 限制，请尝试使用 axios。

Answer 2

var handleError = function (err) {
    console.warn(err);
    return new Response(JSON.stringify({
        code: 400,
        message: 'Stupid network Error'
    }));
};

var getPost = async function () {

    // Get the post data
    var post = await (fetch('https://jsonplaceholder.typicode.com/posts/5').catch(handleError));

    // Get the author
    var response = await (fetch('https://jsonplaceholder.typicode.com/users/' + post.userId).catch(handleError));

       if (response.ok) {
            return response.json();
        } else {
            return Promise.reject(response);
        }

};

Answer 3

您可以像普通的命令式编程一样使用try/catch：

try {
    let response = await fetch("/charge/pay", {
      method: "POST",
      headers: {
          "Content-Type": "application/json"
      },
      body: JSON.stringify(data)
    });
} catch(error) {
    // Error handling here!
}

或者你可以混合搭配.catch()，就像你对承诺做的那样：

let response = await fetch("/charge/pay", {
    method: "POST",
    headers: {
       "Content-Type": "application/json"
    },
    body: JSON.stringify(data)
}).catch(function(error) {
    // Error handling here!
});

Answer 4

用 try catch 包装你的 await。

try {
    let response = await fetch("/charge/pay", {
      method: "POST",
      headers: {
        "Content-Type": "application/json"
      },
      body: JSON.stringify(data)
    });

    console.log(response);
} catch (error) {
    console.log(error);
}

Answer 5

 async function loginWithRedirect(payload: {
        username: string;
        password: string;
    }) {
      const resp = await (await fetch(`${env.API_URL}/api/auth/login`, {
        method: "POST",
        headers: {"Content-Type": "application/json"},
        body: JSON.stringify(payload),
        credentials: "include",
      })).json();
      if (resp.error) {
        dispatch({type: "ERROR", payload: resp.error.message});
      } else {
        dispatch({type: "LOGIN", payload: resp});
      }
    }

Answer 6

如果 response.ok 为 false，你可以抛出一个错误，然后在调用你的函数后链式 catch 方法如下

async function fetchData(){
    const response = await fetch("/charge/pay", {
      method: "POST",
      headers: {
          "Content-Type": "application/json"
      },
      body: JSON.stringify(data)
    });

    if(!response.ok){
        const message = `An error occured: ${response.status}`;
        throw new Error(message);
    }
    
    const data = await response.json();
    return data;
}

fetchData()
    .catch(err => console.log(err.message));

Answer 7

如果服务器返回 { message: "some error" }，则此方法有效，但我正试图让它也支持 res.statusText：

        try {
            const res = await this.fetch(path, {
                method: opts.method || 'GET',
                body: method === 'GET' ? null : body,
                headers
            });

            if (res.ok) {
                return await (opts.raw ? res.text() : res.json());
            }

            const err = await res.json();

            throw new Error(err.message || err.statusText);
        } catch (err) {
            throw new Error(err);
        }

Answer 8

 const data = {
        token: token.id,
        email,
        price,
        name,
        phone,
        city,
        street,
        country
      };
      axios
        .post("/charge/pay", data)
        .then(res => {
          console.log(res);
        })
        .catch(err => {
          console.log(err.response.data);
        });