wxml

<button class=‘baocun‘ bindtap=‘savePoster‘>保存图片</button>

js部分

 //点击保存到相册
  savePoster: function() {
    var that = this
    console.log(that.data.imagePath)
    wx.saveImageToPhotosAlbum({
      filePath: that.data.imagePath,
      success(res) {
        wx.showModal({
          content: '海报已保存到相册',
          showCancel: false,
          confirmText: '好的',
          confirmColor: '#333',
          success: function(res) {
            if (res.confirm) {
              console.log('999999')
              console.log('用户点击确定');
              /* 该隐藏的隐藏 */
              that.setData({
                maskHidden: false
              })
            }
          },
          fail: function(res) {
            console.log(11111)
          }
        })
      },
      fail(res) {
        // wx.showToast({
        //   title: '保存失败',
        //   icon: 'none',
        // })
     // 拒绝授权时，则进入手机设置页面，可进行授权设置
        if (res.errMsg === "saveImageToPhotosAlbum:fail:auth denied" || res.errMsg === "saveImageToPhotosAlbum:fail auth deny") {
          // 这边微信做过调整，必须要在按钮中触发，因此需要在弹框回调中进行调用
          wx.showModal({
            title: '提示',
            content: '需要您授权保存相册',
            showCancel: false,
            success: modalSuccess => {
              wx.openSetting({
                success(settingdata) {
                  console.log("settingdata", settingdata)
                  if (settingdata.authSetting['scope.writePhotosAlbum']) {
                    wx.showModal({
                      title: '提示',
                      content: '获取权限成功,再次点击图片即可保存',
                      showCancel: false,
                    })
                  } else {
                    wx.showModal({
                      title: '提示',
                      content: '获取权限失败，将无法保存到相册哦~',
                      showCancel: false,
                    })
                  }
                },
                fail(failData) {
                  console.log("failData", failData)
                },
                complete(finishData) {
                  console.log("finishData", finishData)
                }
              })
            }

          })
        }
      }
    })
  },

微信小程序之保存图片到本地授权