function openFileByUrl(url){     console.log('url='+url);      this.showLoading();       var hearder = getHeader(url);     console.log(hearder);     wx.downloadFile({         url: url,         header: hearder ,                  success: function (res) {                      console.log(res);                        var filePath = res.tempFilePath;             console.log('filePath==='+filePath);                        wx.openDocument({             filePath: filePath,             success: function (res) {                 console.log('打开文档成功')             },             fail:function(err){                  alert(err.errMsg);             }             })         },         complete:function(){           console.log('compleate');           wx.hideLoading();         }     }) } 安卓手机下载附件（不管是doc，还是pdf）后缀名变成了.htm。然后打开就报：fail file type not supported 2003，ios下正常。 请问什么问题？感谢 [图片] [图片]