add_action('media_buttons', 'add_my_media_button');
function add_my_media_button() {
    echo '<a href="javascript:;" id="insert-my-media" class="button">测试按钮</a>';
}

function add_admin_script() {
    $src = get_bloginfo('template_directory') . '/assets/js/lib/editor-plus.js';
    wp_enqueue_script('boot', $src);
}
add_action('admin_enqueue_scripts', 'add_admin_script');

jQuery(function($) {
  jQuery(document).ready(function() {
    jQuery('#insert-my-media').click(open_media_window);
  });

  function open_media_window() {
    if (this.window === undefined) {
      this.window = wp.media({
        title: 'Insert a media',
        library: {
          type: 'image'
        },
        multiple: false,
        button: {
          text: 'Insert'
        }
      });
      var self = this; // Needed to retrieve our variable in the anonymous function below
      this.window.on('select', function() {
        var first = self.window.state().get('selection').first().toJSON();
        wp.media.editor.insert('[myshortcode id="' + first.id + '"][/myshortcode]');
      });
    }
    this.window.open();
    return false;
  }
});