fixed IE bug

src/adapter/saveto.js

@@ -55,11 +55,17 @@ KM.registerToolbarUI( 'saveto', function ( name ) {
         return iev;
     };
     var doSave = function ( urltype, d, filename ) {
-        var winname = window.open( '', '_blank', 'height=0,width=0,toolbar=no,menubar=no,scrollbars=no,resizable=on,location=no,status=no' );
-        winname.document.open( urltype, 'replace' );
-        winname.document.writeln( d );
-        winname.document.execCommand( 'saveas', '', filename );
-        winname.close();
+        var iframe = document.createElement( 'iframe' );
+        iframe.style.display = 'none';
+        document.body.appendChild( iframe );
+        iframe.contentDocument.open( urltype, 'replace' );
+        iframe.contentDocument.writeln( d );
+        iframe.contentDocument.execCommand( 'saveas', '', filename );
+        // var winname = window.open( '', '_blank', 'height=0,width=0,toolbar=no,menubar=no,scrollbars=no,resizable=on,location=no,status=no' );
+        // winname.document.open( urltype, 'replace' );
+        // winname.document.writeln( d );
+        // winname.document.execCommand( 'saveas', '', filename );
+        // winname.close();
     };
     comboboxWidget.on( 'comboboxselect', function ( evt, res ) {
         var data = me.exportData( res.value );