使用promise 队列，保存多张图片到手机相册
问题:有些手机会出现只能保存五张图片，报错信息:无法写入
promise需要好好学习
核心代码
// pages/saveImgs/index.js import { writePhotosAlbum } from '../../utils/util' Page({ /** * 页面的初始数据 */ data: { list: [ 'https://timgs.top1buyer.com/admin/special/special_img_20190301160008479.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160013201.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160015969.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160025498.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160031519.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160042689.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160108243.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190301160111756.jpg', 'https://timgs.top1buyer.com/admin/special/special_img_20190304160141454.jpg' ], loading:false }, /** * 生命周期函数--监听页面加载 */ onLoad: function(options) {}, // 下载图片 downloadImgs() { var _this = this // 获取保存到相册权限 writePhotosAlbum( function success() { wx.showLoading({ title: '加载中', mask: true }) // 调用保存图片promise队列 _this .queue(_this.data.list) .then(res => { wx.hideLoading() wx.showToast({ title: '下载完成' }) }) .catch(err => { wx.hideLoading() console.log(err) }) }, function fail() { wx.showToast({ title: '您拒绝了保存到相册' }) } ) }, // 队列 queue(urls) { let promise = Promise.resolve() urls.forEach((url, index) => { promise = promise.then(() => { return this.download(url) }) }) return promise }, // 下载 download(url) { return new Promise((resolve, reject) => { wx.downloadFile({ url: url, success: function(res) { var temp = res.tempFilePath wx.saveImageToPhotosAlbum({ filePath: temp, success: function(res) { resolve(res) }, fail: function(err) { reject(res) } }) }, fail: function(err) { reject(err) } }) }) } })
项目案例
git clone https://github.com/sunnie1992/soul-weapp.git
直接用微信小程序开发工具打开就可以看到案例了