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js路由跳转时放弃正在pending的请求

news 2025/8/4 18:10:44

在单页面应用中通常会对请求进行catch处理，如果用户打开a页面后页面发出了一个请求去获取aaa，但是由于某种原因请求一直在pending。此时用户又进入了b页面，在浏览时a页面的请求失败了，然后页面弹出提示：“数据aaa请求失败”。这就很尴尬了。虽然在对于a页面没什么问题，但是对于b页面来说这就是无用的提示。这时就需要在跳转页面时杀掉正在pending的请求了

axios的cancelToken

https://www.kancloud.cn/yunye/axios/234845

使用 cancel token 取消请求
可以使用 CancelToken.source 工厂方法创建 cancel token，像这样：

var CancelToken = axios.CancelToken;
var source = CancelToken.source();axios.get('/user/12345', {cancelToken: source.token
}).catch(function(thrown) {if (axios.isCancel(thrown)) {console.log('Request canceled', thrown.message);} else {// 处理错误}
});// 取消请求（message 参数是可选的）
source.cancel('Operation canceled by the user.');

还可以通过传递一个 executor 函数到 CancelToken 的构造函数来创建 cancel token：

var CancelToken = axios.CancelToken;
var cancel;axios.get('/user/12345', {cancelToken: new CancelToken(function executor(c) {// executor 函数接收一个 cancel 函数作为参数cancel = c;})
});// 取消请求
cancel();

vue路由跳转时cancel请求

定义请求services.js

import axios from 'axios';const url = 'http://localhost:3001';export function AApi() {return axios.get(`${url}/a`);
}export function BApi() {return axios.get(`${url}/b`);
}export function CApi() {return axios.get(`${url}/c`, {cancelToken: null, // 避免被加入cancel队列});
}

定义axios拦截器设置cancelToken

export * from './services';import axios from 'axios';const cancelTokenSources = new Map(); // 定义cancel队列axios.interceptors.request.use(config => { // 请求拦截器中将请求加入cancel队列if (!config.hasOwnProperty('cancelToken')) { // 排除不需要cancel的请求const source = axios.CancelToken.source();cancelTokenSources.set(source.token, source.cancel); // 加入cancel队列config.cancelToken = source.token;}return config;
}, error => Promise.reject(error));axios.interceptors.response.use(res => { // 响应拦截器中从cancel队列中移除if (res.config.cancelToken) {cancelTokenSources.delete(res.config.cancelToken);}return res;
}, error => {if (axios.isCancel(error)) {cancelTokenSources.delete(error.message)}return Promise.reject(error)
});export default cancelTokenSources;

将需要放弃的请求加入cancel队列

定义路由router.js

import Vue from 'vue'
import Router from 'vue-router'
import Home from './views/Home.vue'
import About from './views/About.vue'
import cancelTokenSources from './api';Vue.use(Router);const router = new Router({mode: 'history',base: process.env.BASE_URL,routes: [{path: '/',name: 'home',component: Home},{path: '/about',name: 'about',// route level code-splitting// this generates a separate chunk (about.[hash].js) for this route// which is lazy-loaded when the route is visited.component: About}]
});router.afterEach(() => { // 路由跳转杀请求for (const [cancelToken, cancel] of cancelTokenSources) {cancel(cancelToken); // cancel 正在pending的请求}
});export default router;

路由跳转时对cancel队列进行遍历kill

定义about页面，放出请求

<template><div class="about"><h1>This is an about page</h1></div>
</template><script>import { AApi, BApi, CApi } from '../api';import axios from 'axios';export default {name: 'about',mounted() {AApi().catch(err => {if (axios.isCancel(err)) {console.log('请求被关闭了');} else {console.log('请求出问题了');}});BApi().catch(err => {if (axios.isCancel(err)) {console.log('请求被关闭了');} else {console.log('请求出问题了');}});CApi().catch(err => {if (axios.isCancel(err)) {console.log('请求被关闭了');} else {console.log('请求出问题了');}});}}
</script>