argparse - 禁用相同的参数发生(argparse - disable same argument occurrences)

 像这样的东西应该做的伎俩？ 
 
jQuery( function( $ ) {
    var images = [ "bg-1.jpg", "bg-2.jpg", "bg-3.jpg", "bg-4.jpg", "bg-5.jpg" ];
    var currentImage = 0;

    function changeBackground() {
        $( '#page_bg' ).css( { backgroundImage: 'url(' + images[ ++currentImage ] + ')' } );
        if ( currentImage >= images.length - 1 ) {
            currentImage -= images.length;
        }
    }

    setInterval( changeBackground, 5000 );  
});

Something like this should do the trick?
 
jQuery( function( $ ) {
    var images = [ "bg-1.jpg", "bg-2.jpg", "bg-3.jpg", "bg-4.jpg", "bg-5.jpg" ];
    var currentImage = 0;

    function changeBackground() {
        $( '#page_bg' ).css( { backgroundImage: 'url(' + images[ ++currentImage ] + ')' } );
        if ( currentImage >= images.length - 1 ) {
            currentImage -= images.length;
        }
    }

    setInterval( changeBackground, 5000 );  
});