我在自定义程序中添加了一个部分，用于上载主站点的背景图像。我在这里称之为：

.header_wrapper{
background:url(\'<?php echo get_theme_mod( \'header_image_uploaded\', \'http://www.unitedwayofmilford.org/wp-content/uploads/2020/03/Canva-Lending-a-helping-hand..jpg\' ); ?>\') no-repeat center center fixed;

以下是我的自定义程序功能的代码

function uwm_customize_register( $wp_customize ) {

$wp_customize->add_setting( \'header_image\' , array(
\'default\'   => \'http://www.unitedwayofmilford.org/wp-content/uploads/2020/03/Canva-Lending-a-helping-hand.jpg\',) );

$wp_customize->add_section( \'main_header_image\' , array(
\'title\'      => __( \'Choose Your Main Image\', \'uwm\' ),) );

$wp_customize->add_control( 
new WP_Customize_Upload_Control( 
$wp_customize, 
\'header_image_uploaded\', 
array(
    \'label\'      => __( \'Main Image Upload\', \'uwm\' ),
    \'section\'    => \'main_header_image\',
    \'settings\'   => \'header_image\',) ) );
}add_action( \'customize_register\', \'uwm_customize_register\' );