如果您是通过Ajax执行此操作的，那么在收到响应后，可以通过JavaScript重定向

window.location.href = \'url to be redirected to\';

在小部件内部，确保name 对于提交按钮：

<button type="submit" name="widget_submit">Submit</button>

function wpse20150815_processing_widget() {
   if( !isset( $_POST[\'widget_submit\'] ) )
       return;

   //set an array for storing errors
   $errors = array();

   //process form data, and store errors in the $errors array
   if( empty( $_POST[\'pincode\'] ) ) {
      $errors[] = __( \'Pincode cannot be empty\', \'textdomain\' );
   }

   //if there\'s an error in our data validation, don\'t proceed further
   if( !empty($errors) )
      return;

   //do what you want with the processed data
   //don\'t forget to sanitize form fields before storing data into database

   //i.e. inserting post content using the form data
   $post_id = wp_insert_post(...); //dummy presentation, use proper sanitization etc.

   if( !is_wp_error( $post_id ) ) {
      //if the post is inserted successfully, then redirect
      wp_redirect(\'path/you/desire/\');
      exit;
   }
}
add_action( \'template_redirect\', \'wpse20150815_processing_widget\' );