In your functions.php file you should add an action to enqueue your scripts.
<?php
function my_enqueue_scripts() {
wp_enqueue_script(
'load_post',
get_template_directory_uri() . '/js/load_post.js',
array( 'jquery' ),
'1.0',
1
);
wp_localize_script(
'load_post',
'wp_ajax',
array(
'url' => admin_url( 'admin-ajax.php' ),
'nonce' => wp_create_nonce( 'ajax_nonce' )
)
);
}
add_action( 'wp_enqueue_scripts', 'my_enqueue_scripts' );
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