angularjs - Download only new files on an Ionic app? -

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i want download file server if file new. example, checking file modified date. using below code download file, stuck need compare files before downloading. can please give me solution this.

.factory('filedownloadservice',['$cordovafiletransfer', function($cordovafiletransfer){ return{     filedownload:function(){          // file download         var url = "http://www.xxxxx/file-to-download.json";          // file name         var filename = url.split("/").pop();          // save location         var targetpath = cordova.file.externalrootdirectory + filename;          $cordovafiletransfer.download(url, targetpath, {}, true).then(function (result) {             console.log('download successful');             }, function (error) {                 console.log('download error');             }, function (progress) {                  // progress handling             });     }  }}])

appreciate help. thank you


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