下面是一个场景-我想从下拉列表中选择fontawesome图标，但它不起作用。由于某种原因span 不符合要求（我已经试过了jQuery().append(), CSS）但到目前为止没有运气。任何帮助都将不胜感激。

Code in Page.php file

<div class="features-block-one">
  <div class="icon-one">
   <span class="<?php get_theme_mod(\'features_one_icon\' ,\'fa fa-bullseye\');?>">  </span>
  </div>
</div>

//block one icon
       $wp_customize->add_setting(
        \'features_one_icon\',
        array(
            \'default\' => \'fa-fa box\',
            \'transport\' => \'postMessage\',
            \'sanitize_callback\' => \'sanitize_key\',
        )
    );

    $wp_customize->add_control(
        \'features_one_icon_control\',
         array(
            \'label\' => __(\'Select Icon\', \'text-domain\'),
            \'section\' => \'features_block\',
            \'type\' => \'select\',
            \'settings\' => \'features_one_icon\',
            \'choices\' => tar_icons() /*With function tar_icons() I\'m pulling all the icons from the function */
        )
    );

Code in customizer.js file

wp.customize( \'features_one_icon\', function( value ) {
        value.bind( function( to ) {
            $( \'.features-block-one .icon-one span\' ).css( to  );
          } );
    } );