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有时候会有一个需求,就是跳转到一个页面的时候,必须要有loading,然后等该页面所有的接口都调完,才能关闭loading。中怎么处理呢?我们一般是在请求和响应拦截器中添加loading效果,我这边整理了以下两种方法。
$ npm i element-ui -S
$ npm i lodash -S
$ npm i axios -S
使用element-ui的Loading组件,这个组件有两种调用方式:
1、通过指v-loading
2、通过服务Loading.service();
loading.js
import { Loading } from "element-ui"; import _ from 'lodash'; let loading = null; let needRequestCount = 0; //开启loading状态 const startLoading = (headers={}) => { loading = Loading.service({ lock: true, //是否锁定屏幕的滚动 text: headers.text||"加载中……", //loading下面的文字 background: "rgba(0, 0, 0, 0.7)", //loading的背景色 target:headers.target||"body" //loading显示在容器 }); }; //关闭loading状态 //在关闭loading为了防止loading的闪动,采用防抖的方法,防抖计时一般采用300-600ms //在关闭loading之后,我们需注意全局变量导致的V8垃圾回收机制,把没用的变量清空为null const endLoading = _.debounce(() => { loading.close(); loading = null; },300); export const showScreenLoading=(headers)=>{ if(needRequestCount == 0&&!loading){ startLoading(headers); } needRequestCount++; } export const hideScreenLoading=()=>{ if(needRequestCount<=0) return needRequestCount--; needRequestCount = Math.max(needRequestCount, 0); if(needRequestCount===0){ endLoading() } } export default {};
import axios from "axios"; import Lockr from "lockr"; import { showScreenLoading, hideScreenLoading } from "./loading"; import { Message } from "element-ui"; class Service { construct() { this.baseURL = process.env.VUE_APP_URL; this.timeout = 3000; //请求时间 } request(config) { let instance = axios.create({ baseURL: this.baseURL, timeout: this.timeout }); //请求拦截器 instance.interceptors.request.use( config => { config.headers.Authorization = Lockr.get("token"); if (config.headers.showLoading !== false) { showScreenLoading(config.headers); } return config; }, error => { if (config.headers.showLoading !== false) { hideScreenLoading(config.headers); } Message.error("请求超时!"); return Promise.reject(error); } ); //响应拦截器 instance.interceptors.response.use( response => { if (response.status == 200) { setTimeout(() => { if (response.config.headers.showLoading !== false) { hideScreenLoading(); } }, 500); return response.data; } }, error => { if (response.config.headers.showLoading !== false) { hideScreenLoading(); } return Promise.reject(error); } ); return instance(config); } } export default new Service();
loading.js
Vue.prototype.openLoading = function() { const loading = this.$loading({ // 声明一个loading对象 lock: true, // 是否锁屏 text: '加载中', // 加载动画的文字 spinner: 'el-icon-loading', // 引入的loading图标 background: 'rgba(0, 0, 0, 0.8)', // 背景颜色 target: '.el-table, .table-flex, .region', // **需要遮罩的区域,这里写要添加loading的选择器** fullscreen: false, customClass: 'loadingclass' // **遮罩层新增类名,如果需要修改loading的样式** }) setTimeout(function () { // 设定定时器,超时5S后自动关闭遮罩层,避免请求失败时,遮罩层一直存在的问题 loading.close(); // 关闭遮罩层 },5000) return loading; }
或者跟第一种方法一样,在拦截器里面引入和调用就是全局调用,后面调接口的时候就不需要加这一行代码了
//组件内
getlist() {
//创建loading对象开始遮罩
const rLoading = this.openLoading();
//发送请求
query().then(res => {
//请求结束关闭loading
rLoading.close();
})
}
关于设置loading的样式:customClass: ‘loadingclass’,再app.vue中添加一下这个class去改loading的样式就好了
<style lang="scss">
.loadingclass {
.el-loading-spinner {
i {
color: #139cb6;
}
.el-loading-text {
color: #139cb6;
}
}
}
</style>
<template> <div class="twoPage"> <el-table :data="tableData" style="width: 100%"> <el-table-column prop="date" label="日期" width="180"></el-table-column> <el-table-column prop="name" label="姓名" width="180"></el-table-column> <el-table-column prop="address" label="地址"></el-table-column> </el-table> <el-button @click="showLoading">我是个神奇的按钮</el-button> </div> </template> <script> import { showScreenLoading, hideScreenLoading } from "@/assets/js/loading"; export default { data() { return { tableData: [{date: '2016-05-03',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'}, {date: '2016-05-02',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'}, {date: '2016-05-04',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'} ] }; }, mounted() { }, methods: { showLoading(){ this.loading1() this.loading2() this.loading3() this.loading4() }, loading1(){ console.log('打开1') showScreenLoading() setTimeout(()=>{ hideScreenLoading() console.log('关闭1') },1000) }, loading2(){ console.log('打开2') showScreenLoading() setTimeout(()=>{ hideScreenLoading() console.log('关闭2') },2000) }, loading3(){ console.log('打开3') showScreenLoading() setTimeout(()=>{ hideScreenLoading() console.log('关闭3') },3000) }, loading4(){ console.log('打开4') showScreenLoading() setTimeout(()=>{ hideScreenLoading() console.log('关闭4') },4000) } } }; </script> <style lang="less"> </style>
完美!!!
<template> <div class="twoPage"> <el-table :data="tableData" style="width: 100%"> <el-table-column prop="date" label="日期" width="180"></el-table-column> <el-table-column prop="name" label="姓名" width="180"></el-table-column> <el-table-column prop="address" label="地址"></el-table-column> </el-table> <el-button @click="showLoading">我是个神奇的按钮</el-button> </div> </template> <script> export default { data() { return { tableData: [{date: '2016-05-03',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'}, {date: '2016-05-02',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'}, {date: '2016-05-04',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'} ] }; }, methods: { showLoading(){ this.loading1() this.loading2() this.loading3() this.loading4() }, loading1(){ console.log('开始1') const rLoading = this.openLoading(); setTimeout(()=>{ rLoading.close(); console.log('结束1') },1000) }, loading2(){ console.log('开始2') const rLoading = this.openLoading(); setTimeout(()=>{ rLoading.close(); console.log('结束2') },2000) }, loading3(){ console.log('开始3') const rLoading = this.openLoading(); setTimeout(()=>{ rLoading.close(); console.log('结束3') },3000) }, loading4(){ console.log('开始4') const rLoading = this.openLoading(); setTimeout(()=>{ rLoading.close(); console.log('结束4') },4000) }, } }; </script> <style lang="less"> </style>
效果看着还行,就是有个细节问题就是:多个请求的时候打开的loading层会越来越厚,后面会越来越薄。不过效果是实现了,如果loading背景是白色可能这个弊端就不太会暴露。
结论:第一种方法看着美观,但逻辑可能稍微有点复杂,而且引入了lodash第三方插件。第二种方案也还行,但如果请求过多,相对可能透明样式有点生硬。自行选择啦~~~~
参考博客:https://blog.csdn.net/qq_41643208/article/details/125089166,https://blog.csdn.net/weixin_45685252/article/details/114917309
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