javascript - PHP if else condition inside JS file Wordpress theme customizer condition

$('.class1').append( '' );
    var button = $('.class1.load-more');

the above is a code from the .js file of WP infinite scroll Wordpress plugin.

Can we somehow put a PHP condition inside a js file:

If( logical condition 1 )  {
    $('.class1').append( '' );
    var button = $('.class1.load-more');
} elseif( logical condition 2 )  {

    $('.class2').append( '' );
    var button = $('.class2 .load-more');
}

P.S.: PHP logic should go inside a js file not script<> tags.