Hyperlink in ckeditor

CKEDITOR.on( 'dialogDefinition', function( ev ) {
    // Take the dialog name and its definition from the event data.
    var dialogName = ev.data.name;
    var dialogDefinition = ev.data.definition;

    if ( dialogName == 'link' ) {
      var targetTab = dialogDefinition.getContents( 'target' );
      // Set the default value for the URL field.
      var targetField = targetTab.get( 'linkTargetType' );
      var targetName = targetTab.get( 'linkTargetName' );
      targetField[ 'default' ] = '_blank';
      targetName[ 'default' ] = '_blank';
    }
  });