JS功能在Chrome中运行,但在Firefox中不起作用

我创建了一个在Chrome上工作正常的功能,但似乎在firefox上产生错误

ReferenceError: playNextClip is not defined

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我的JS如下.

 function queueVideos(num, amount) {

    if (num < amount) {
        document.getElementById('video-element-'+num).addEventListener(
            'ended',
            playNextClip,
            false);
        function playNextClip() {
            var nextVid = num + 1;
            $( '#video-element-' + nextVid ).show().get(0).play();
            $( '#video-element-' + num ).hide();
            document.getElementById( 'video-element-' + num ).pause();
            document.getElementById( 'video-element-' + num ).currentTime = 0;
            queueVideos(nextVid, amount)
        }
    }

    if (num == amount) {
        document.getElementById('video-element-'+num).addEventListener(
            'ended',
            playFirst,
            false);
        function playFirst() {
            $( '#video-element-1' ).show().get(0).play();
            $( '#video-element-' + num ).hide();
            document.getElementById( 'video-element-' + num ).pause();
            document.getElementById( 'video-element-' + num ).currentTime = 0;
        }
    }

}

queueVideos(1, 5);

为什么这在Chrome中有效但在Firefox中无效？
我该怎么做才能使它跨浏览器兼容？

谢谢!

    function queueVideos(num, amount) {
        if (num < amount) {

            function playNextClip() {
                var nextVid = num + 1;
                $( '#video-element-' + nextVid ).show().get(0).play();
                $( '#video-element-' + num ).hide();
                document.getElementById( 'video-element-' + num ).pause();
                document.getElementById( 'video-element-' + num ).currentTime = 0;
                queueVideos(nextVid, amount)
            }
               document.getElementById('video-element-'+num).addEventListener(
                'ended',
                playNextClip,
                false);
        }

        if (num == amount) {

            function playFirst() {
                $( '#video-element-1' ).show().get(0).play();
                $( '#video-element-' + num ).hide();
                document.getElementById( 'video-element-' + num ).pause();
                document.getElementById( 'video-element-' + num ).currentTime = 0;
            }
document.getElementById('video-element-'+num).addEventListener(
                'ended',
                playFirst,
                false);
        }

    }
    queueVideos(1, 5);

尝试在addeventlistener之前给出函数defination.