小程序：下载图片文件（wx.downloadFile）并保存到手机相册（wx.saveImageToPhotosAlbum）

封装下载函数：

downloadAllPic (imgData) {  wx.showLoading({    title: '图片下载中'  })  let uploadNum = 0  let picNum = 0  imgData.forEach((item, index, arr) => {    if (item.imgUrl) {      picNum++      wx.downloadFile({        url: item.imgUrl,        success: function (res) {          // 图片保存到本地          wx.saveImageToPhotosAlbum({            filePath: res.tempFilePath,            success: function (data) {              uploadNum++              if (uploadNum === picNum) {                wx.hideLoading()                wx.showModal({                  title: '提示',                  content: '图片已保存到您的手机相册',                  showCancel: false                })              }            },            fail: function (err) {              console.log(err)              if (err.errMsg === 'saveImageToPhotosAlbum:fail auth deny') {                console.log('当初用户拒绝，再次发起授权')                wx.openSetting({                  success(settingdata) {                    console.log(settingdata)                    if (settingdata.authSetting['scope.writePhotosAlbum']) {                      console.log('获取权限成功，给出再次点击图片保存到相册的提示。')                    } else {                      console.log('获取权限失败，给出不给权限就无法正常使用的提示')                    }                  }                })              }            },            complete(res) {              console.log(res)            }          })        }      })    }  })}

使用：

const allPicList = [{imgName: '图一',imgUrl: 'https://file.lsjlt.com/upload/f/202309/25/cz5iep3cwi3.jpg'},{imgName: '图二',imgUrl: 'https://file.lsjlt.com/upload/f/202309/25/cz5iep3cwi3.jpg'}]downloadAllPic(allPicList)

来源地址：https://blog.csdn.net/aaa123aaasqw/article/details/130621068