安卓6.0，微信6.5.10

console.log报：openDocument:fail user cancel

代码：

viewDocument: function(e) {

    var that = this;

    this.setData({buttonText: '下载中...'});

    this.download(this.data.url, function (res) {

      that.setData({ buttonText: '查看原文件' });

      wx.openDocument({

        filePath: res.tempFilePath,

        success: function () {

        },

        fail:function(res){

          console.log(res);

        }

      });

    });

  },