javascript - 在javascript中 promise 解决和拒绝

Question

我正在尝试在 NativeScript 上构建一个移动应用程序，我在其中创建了一个用于授权的类，该类具有一个 login() 函数，该函数具有以下代码:

export default class NitsEditorAuth {
    //Finding logged-in user.
    isLoggedIn() {
        return store.getters.access_token ? true : false;
    }
    //For Login user
    login(user) {
        const postData = {
            grant_type: 'password',
            username: user.email,
            password: user.password,
            client_id: clientId,
            client_secret: clientSecret,
            scope: '',
            provider: provider
        }
        const authUser = {}
        axios.post(authUrl, postData).then(response => {
            if(response.status === 200)
            {
                authUser.access_token = response.data.access_token;
                authUser.refresh_token = response.data.refresh_token;
                axios.get(apiUrl + 'user/log', {headers: getHeader()}).then(response => {
                    if(response.status === 200){
                        authUser.email = response.data.email;
                        authUser.first_name = response.data.first_name;
                        authUser.last_name = response.data.last_name;
                        authUser.userRole = response.data.role;
                        store.commit('save', authUser);
                        return new Promise(function (resolve, reject) {
                            resolve('Login successful')
                        });
                    }
                })
            }
        })
        .catch((err) => {
            if(err.response.status === 401){
//                this.error = err.response.data.message
                return new Promise(function (resolve, reject) {
                    reject('Validation error')
                });
            }
            else
                return new Promise(function (resolve, reject) {
                    reject('Something went wrong')
                });
        })
    }

}

我在我的 main.js 文件中包含了这个类:

const nitsEditorAuth = new NitsEditorAuth();
Vue.prototype.$nitsEditorAuth = nitsEditorAuth;

我在我的 Vue-methods 中调用这个函数，例如:

login() {
    this.$nitsEditorAuth
        .login(this.user)
        .then(() => {
           this.processing = false;
           this.$navigateTo(Home, { clearHistory: true });
        })
        .catch(() => {
           this.processing = false;
           this.alert(
              "Unfortunately we could not find your account."                   
           );
        });
},

但我收到错误说明:

TypeError: Cannot read property 'then' of undefined. Frame: function:'login'

帮我解决这个问题。谢谢。

Answer 1

简单的解决方法就是在函数外包装一个 promise。并删除其余部分。例如。

javascript node.js vue.js nativescript nativescript-vue
I'm trying to build a mobile application on NativeScript where I've created a class for authorization which has a login() function which has following codes:

export default class NitsEditorAuth {
    //Finding logged-in user.
    isLoggedIn() {
        return store.getters.access_token ? true : false;
    }
    //For Login user
    login(user) {
        const postData = {
            grant_type: 'password',
            username: user.email,
            password: user.password,
            client_id: clientId,
            client_secret: clientSecret,
            scope: '',
            provider: provider
        }
return new Promise(function (resolve, reject) {
        const authUser = {}
        axios.post(authUrl, postData).then(response => {
            if(response.status === 200)
            {
                authUser.access_token = response.data.access_token;
                authUser.refresh_token = response.data.refresh_token;
                axios.get(apiUrl + 'user/log', {headers: getHeader()}).then(response => {
                    if(response.status === 200){
                        authUser.email = response.data.email;
                        authUser.first_name = response.data.first_name;
                        authUser.last_name = response.data.last_name;
                        authUser.userRole = response.data.role;
                        store.commit('save', authUser);

                            resolve('Login successful')

                    }
                })
            }
        })
        .catch((err) => {
            if(err.response.status === 401){
//                this.error = err.response.data.message

                    reject('Validation error')

            }
            else

                    reject('Something went wrong')
        })
})
    }