一般项目中,有时候会要求,你在数据请求的时候显示一张gif图片,然后数据加载完后,消失。这个,一般只需要在封装的axios中写入js事件即可。当然,我们首先需要在app.vue中,加入此图片。如下:
<template> <div id="app"> <loading v-show="fetchLoading"></loading> <router-view></router-view> </div> </template> <script> import { mapGetters } from 'vuex'; import Loading from './components/common/loading'; export default { name: 'app', data() { return { } }, computed: { ...mapGetters([ 'fetchLoading', ]), }, components: { Loading, } } </script> <style> #app{ width: 100%; height: 100%; } </style>
这里的fetchLoading是存在vuex里面的一个变量。在store/modules/common.js里需要如下定义:
/* 此js文件用于存储公用的vuex状态 */ import api from './../../fetch/api' import * as types from './../types.js' const state = { // 请求数据时加载状态loading fetchLoading: false } const getters = { // 请求数据时加载状态 fetchLoading: state => state.fetchLoading } const actions = { // 请求数据时状态loading FETCH_LOADING({ commit }, res) { commit(types.FETCH_LOADING, res) }, } const mutations = { // 请求数据时loading [types.FETCH_LOADING] (state, res) { state.fetchLoading = res } }
loading组件如下:
<template> <div class="loading"> <img src="./../../assets/main/running.gif" alt=""> </div> </template> <script> export default { name: 'loading', data () { return {} }, } </script> <!-- Add "scoped" attribute to limit CSS to this component only --> <style scoped> .loading{ position: fixed; top:0; left:0; z-index:121; width: 100%; height: 100%; background: rgba(0,0,0,0.3); display: table-cell; vertical-align: middle; text-align: center; } .loading img{ margin:5rem auto; } </style>
最后在fetch/api.js里封装的axios里写入判断loading事件即可:如下
// axios的请求时间 let axiosDate = new Date() export function fetch (url, params) { return new Promise((resolve, reject) => { axios.post(url, params) .then(response => { // 关闭 loading图片消失 let oDate = new Date() let time = oDate.getTime() - axiosDate.getTime() if (time < 500) time = 500 setTimeout(() => { store.dispatch('FETCH_LOADING', false) }, time) resolve(response.data) }) .catch((error) => { // 关闭 loading图片消失 store.dispatch('FETCH_LOADING', false) axiosDate = new Date() reject(error) }) }) } export default { // 组件中公共页面请求函数 commonApi (url, params) { if(stringQuery(window.location.href)) { store.dispatch('FETCH_LOADING', true); } axiosDate = new Date(); return fetch(url, params); } }
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