<view bindtap=\'save\'>保存图片到相册</view>

 1 //点击保存图片
 2   save () {
 3     let that = this
 4     //若二维码未加载完毕，加个动画提高用户体验
 5     wx.showToast({
 6       icon: \'loading\',
 7       title: \'正在保存图片\',
 8       duration: 1000
 9     })
10     //判断用户是否授权"保存到相册"
11     wx.getSetting({
12       success (res) {
13         //没有权限，发起授权
14         if (!res.authSetting[\'scope.writePhotosAlbum\']) {
15           wx.authorize({
16             scope: \'scope.writePhotosAlbum\',
17             success () {//用户允许授权，保存图片到相册
18               that.savePhoto();
19             },
20             fail () {//用户点击拒绝授权，跳转到设置页，引导用户授权
21               wx.openSetting({
22                 success () {
23                   wx.authorize({
24                     scope: \'scope.writePhotosAlbum\',
25                     success() {
26                       that.savePhoto();
27                     }
28                   })
29                 }
30               })
31             }
32           })
33         } else {//用户已授权，保存到相册
34           that.savePhoto()
35         }
36       }
37     })
38   },
39 //下载图片地址并保存到相册，提示保存成功
40   savePhoto() {
41     let that = this
42     wx.downloadFile({
43       url: that.data.imgUrl,
44       success: function (res) {
45         wx.saveImageToPhotosAlbum({
46           filePath: res.tempFilePath,
47           success(res) {
48             wx.showToast({
49               title: \'保存成功\',
50               icon: "success",
51               duration: 1000
52             })
53           }
54         })
55       }
56     })
57   }