javascript - File Download from Ext AJAX -

hi tar file in response text ext ajax need convert file , download. please let me know way.

ext.ajax.request({              url : 'download.do',              method:'post',              async:false,              usedefaultxhrheader: false,              cors: true,              params : configrequest.parameters,              scope : this,              success : configrequest.success?configrequest.success:function(response){                     var res = ext.decode(response.responsetext);                     if(res.result && res.result=='error'){                         this.ajaxerrordisplay(res.err);                     } }, failure : configrequest.failure?configrequest.failure:function(msg){}}); 

you can create hidden form , submit try code.

getdownloadform: function(url, requestparams) {         var hiddenform = ext.getcmp('download-file-excel-form');         if (!hiddenform) {             hiddenform = ext.create('ext.form.panel', {               title:'hiddenform',               id: 'download-file-excel-form',                                            height:0,               width: 0,               hidden:true             });         }             hiddenform.getform().submit({             url: url,             standardsubmit: true,             method: 'post',              timeout: 120000,             params: requestparams         });     }