js文件代码

Page({
  data: {
    imglist: [
      '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'
    ],
    imgNew: []
  },
  // 点击一键下载图片按钮
  DownloadImgList() {
    var that = this;
    if (that.data.imglist.length == 0) { // 判断数组是否有图片
      wx.showToast({
        title: '暂无图片下载',
        icon: 'none',
        duration: 2000
      });
      return false;
    }
    // 判断用户是否授权
    wx.getSetting({
      success: function (res) {
        if (res.authSetting["scope.writePhotosAlbum"] == false) {
          wx.showToast({
            title: '您还未授权保存相册，请授权',
            icon: 'none',
            duration: 2000
          })
          wx.openSetting({
            success: function (res) {
              if (res.authSetting["scope.writePhotosAlbum"] == true) {
                // 保存相册
                that.dowImg();
              } 
              if (res.authSetting["scope.writePhotosAlbum"] == false) {
                wx.showToast({
                  title: '授权失dsds败！',
                  icon: 'none',
                  duration: 2000
                })
              }
            }
          });
        } else {
          // 遍历所有图片
          for (let i = 0; i < that.data.imglist.length; i++) {
            wx.downloadFile({
              url: that.data.imglist[i], // 需下载的每一张图片路径
              success: function (res) {
                wx.saveImageToPhotosAlbum({
                  filePath: res.tempFilePath,
                  success: function (response) {
                    if (response.errMsg == "saveImageToPhotosAlbum:ok") {
                      wx.showToast({
                        title: '下载成功',
                        icon: 'success',
                        duration: 2000
                      })
                    }
                  }
                });
              },
              fail: function () {
                wx.showToast({
                  title: '下载失败',
                  icon: 'none',
                  duration: 2000
                })
              }
            });
          }
        }
      }
    });
  },
  // 图片预览和单独下载
  aloneDow(e) {
    let src = e.currentTarget.dataset.src; //获取data-src
    let imgList = e.currentTarget.dataset.list; //获取data-list
    let that = this;
    imgList.forEach(function (item, index) {
      console.log(item); //这里的item就是从数组里拿出来的每一个每一组
      that.setData({
        imgNew: that.data.imgNew.concat(item) // 添加到新数组
      });
    });
    wx.previewImage({
      current: src, // 当前显示图片的http链接
      urls: this.data.imgNew // 需要预览的图片http链接列表
    });
  }
});

wxml文件:

<view bindtap="DownloadImgList">下载</view>

wxss文件：

.dowimg{
  margin: 0 0 50rpx 30rpx;
  width: 200rpx;
  height: 80rpx;
  line-height: 80rpx;
  text-align: center;
  color: #FFFFFF;
  background-color: #07c160;
  font-weight: 500;
  border-radius: 10rpx;
}
.imglist{
  display: flex;
  flex-wrap: wrap;
}
.imgitem{
  margin: 0 10rpx 10rpx;
  width: 230rpx;
  height: 230rpx;
}
image{
  display: block;
  width: 100%;
  height: 100%;
}