无法使用 JavaScript 获取响应状态代码

can#39;t get response status code with JavaScript fetch(无法使用 JavaScript 获取响应状态代码)

问题描述

我正在尝试创建一个登录表单.当我用 Postman 测试服务时，我会得到一个带有状态码等的 body 对象.

I'm trying to create a login form. when I'm testing the service with Postman, I will get a body object with status code and etc.

但是，使用 JavaScript 获取，我无法获取 body 对象，我刚刚收到一个错误:

But, with JavaScript fetch, I can't get body object and I just received an error:

export const login = (username,password) => {
    return dispatch=>{
        const basicAuth = 'Basic ' + btoa(username + ':' + password);
        let myHeaders = new Headers();
            myHeaders.append('Authorization', basicAuth);
            myHeaders.append('Content-Type', 'application/json');      
            fetch(`${baseUrl}api/user/login`, {
                withCredentials: true,
                headers: myHeaders
            })
            .then(function (response) {
                return response.json();
            })
            .then(function (json) {
                dispatch(setLoginInfo(json))
            })
            .catch(err =>{
                console.log(err)
                 dispatch(loginFailed())
            });
    }

}

我需要获取状态码.

推荐答案

状态码是 status 属性在响应对象上.此外，除非您在 error 响应中使用 JSON(当然有些人会这样做)，否则您需要检查状态代码(或 ok flag) 在调用 json 之前:

The status code is the status property on the response object. Also, unless you're using JSON with your error responses (which some people do, of course), you need to check the status code (or the ok flag) before calling json:

fetch(`${baseUrl}api/user/login`, {
    withCredentials: true,
    headers: myHeaders
})
.then(function(response) {
    console.log(response.status); // Will show you the status
    if (!response.ok) {
        throw new Error("HTTP status " + response.status);
    }
    return response.json();
})
.then(// ...

不检查请求是否成功是一个常见的错误，我 写了它上我贫血的小博客.

Not checking that the request succeeded is such a common mistake I wrote it up on my anemic little blog.

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