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uniapp下载&打开实现方案，支持安卓ios和h5

Android：
1、申请本地存储读写权限
2、创建文件夹（文件夹不存在即创建）
3、下载文件

ios：
1、下载文件
2、保存到本地，需要打开文件点击储存

使用方法：

downloadFile(fileUrl, fileName)

file.js

let downloadFilePath = '/storage/emulated/0/yulong-ys-files'
// 创建文件夹
export const createDir = () => {return new Promise((resolve, reject) => {// 申请本地存储读写权限plus.android.requestPermissions(['android.permission.WRITE_EXTERNAL_STORAGE','android.permission.READ_EXTERNAL_STORAGE','android.permission.INTERNET','android.permission.ACCESS_WIFI_STATE'], success => {const File = plus.android.importClass('java.io.File')let file = new File(downloadFilePath)// 文件夹不存在即创建if (!file.exists()) {file.mkdirs()resolve()}resolve()}, error => {Tips.toast('无法获取权限，文件下载将出错')reject(error)})})}// 下载文件操作
async function doDownloadFile(url, fileName, options, osName) {if (osName === 'Android') {await createDir()}Tips.loading('正在下载...')let dTask = plus.downloader.createDownload(url, options, async (d, status) => {Tips.hideLoading()if (status == 200) {plus.io.convertLocalFileSystemURL(d.filename)await Tips.confirm('文件已保存，是否打开？')uni.openDocument({filePath: d.filename,success: () => {console.log('成功打开')}})} else {console.log('下载失败')console.log(d)Tips.toast('下载失败')Tips.hideLoading()plus.downloader.clear()}})dTask.start()
}// 下载文件
export function downloadFile(url, fileName) {if (!url) {Tips.toast('下载地址不能为空')return Promise.reject('下载地址不能为空')}// #ifdef H5window.location.href = url// #endif// #ifdef APP-PLUSlet osName = plus.os.name;if (osName === 'Android') {doDownloadFile(url, fileName, {filename: 'file://' + downloadFilePath + '/' + fileName}, osName)} else {doDownloadFile(url, fileName, {}, osName)}// #endif
}

Tips.js

/*** 提示与加载工具类*/
export default class Tips {constructor() {this.isLoading = false;}/*** 弹出提示框*/static success(title, duration = 1000) {setTimeout(() => {uni.showToast({title: title,icon: "success",mask: true,duration: duration});}, 300);if (duration > 0) {return new Promise((resolve, reject) => {setTimeout(() => {resolve();}, duration);});}}/*** 弹出确认窗口*/static confirm(content, ops = {}, payload = {}) {return new Promise((resolve, reject) => {uni.$showModal({content: content,...ops,success: res => {if (res.confirm) {resolve(payload);} else if (res.cancel) {reject(payload);}},fail: res => {reject(payload);}});});}static toast(title, onHide = undefined, icon = "none") {setTimeout(() => {uni.showToast({title: title,icon: icon,mask: true,duration:1500});}, 0);// 隐藏结束回调if (onHide) {setTimeout(() => {onHide();}, 1500);}}/*** 错误框*/static error(title, onHide) {uni.showToast({title: title,icon: 'error',mask: true,duration: 1500});// 隐藏结束回调if (onHide) {setTimeout(() => {onHide();}, 1500);}}/*** 弹出加载提示*/static loading(title = "加载中") {if (Tips.isLoading) {return;}Tips.isLoading = true;uni.showLoading({title: title,mask: true});}/*** 加载完毕*/static hideLoading() {if (Tips.isLoading) {Tips.isLoading = false;uni.hideLoading();}}
}/*** 静态变量，是否加载中*/
Tips.isLoading = false;

参考博客，在次基础上做了修改