如题所示
相关源码:
service.interceptors.request.use( config => { // do something before request is sent // if (store.getters.token) { // config.headers['X-Token'] = getToken() // } return config }, error => { // do something with request error console.log(error) // for debug return Promise.reject(error) } ) // response interceptor service.interceptors.response.use( /** * If you want to get http information such as headers or status * Please return response => response */ /** * Determine the request status by custom code * Here is just an example * You can also judge the status by HTTP Status Code */ response => { const res = response.data // store.commit('SET_LOADING',false); // if the custom code is not 20000, it is judged as an error. if (res.code !== 20000) { return Promise.reject(new Error(res.message || 'Error')) } else { return res } }, error => { console.log('err' + error) // for debug return Promise.reject(error) } )
Promise初步详解(resolve,reject,catch)
综上所述,这个Promise对象的reject方法会将Promise对象的状态转换为rejected,也就是意味着操作失败,然后把错误传进来。