show-menu-by-longpress 点击转发保存等无效

      setTimeout(function () {
        wx.canvasToTempFilePath({
          canvasId: 'mycanvas',
          success: function (res) {
            let tempFilePath = res.tempFilePath;
            that.setData({
              loadImagePath: tempFilePath,
            });
          },
          fail: function (res) {
            console.log(res);
          }
        }, that);
      }, 500);

image 的src 使用的是loadImagePath