无需插件Woocommerce简单产品和可变产品添加buy now快速购买按钮

/*简单产品和可变产品buy now*/
add_action( 'woocommerce_after_add_to_cart_button', 'add_custom_addtocart_and_checkout' );
function add_custom_addtocart_and_checkout() {
global $product;

$addtocart_url = wc_get_checkout_url().'?add-to-cart='.$product->get_id();
$button_class = 'buynow single_add_to_cart_button button alt custom-checkout-btn';
$button_text = __("Buy Now", "woocommerce");

if( $product->is_type( 'simple' )) :
?>
<script>
jQuery(function($) {
var url = '<?php echo $addtocart_url; ?>',
qty = 'input.qty',
button = 'a.custom-checkout-btn';

// On input/change quantity event
$(qty).on('input change', function() {
$(button).attr('href', url + '&quantity=' + $(this).val() );
});
});
</script>
<?php

elseif( $product->is_type( 'variable' ) ) :

$addtocart_url = wc_get_checkout_url().'?add-to-cart=';
?>
<script>
jQuery(function($) {
var url = '<?php echo $addtocart_url; ?>',
vid = 'input[name="variation_id"]',
pid = 'input[name="product_id"]',
qty = 'input.qty',
button = 'a.custom-checkout-btn';

// Once DOM is loaded
setTimeout( function(){
if( $(vid).val() != '' ){
$(button).attr('href', url + $(vid).val() + '&quantity=' + $(qty).val() );
}
}, 300 );

// On input/change quantity event
$(qty).on('input change', function() {
if( $(vid).val() != '' ){
$(button).attr('href', url + $(vid).val() + '&quantity=' + $(this).val() );
}
});

// On select attribute field change event
$('.variations_form').on('change blur', 'table.variations select', function() {
if( $(vid).val() != '' ){
$(button).attr('href', url + $(vid).val() + '&quantity=' + $(qty).val() );
}
});
});
</script>
<?php
endif;
echo '<a href="'.$addtocart_url.'" class="'.$button_class.'">'.$button_text.'</a>';
}