视频关闭但无法再次打开

Question

下面是单击按钮时视频打开然后关闭后，如果我们重新尝试打开视频的代码。仅打开弹出窗口，但视频将不可见。

请帮忙

jQuery的：

$("[data-media]").on("click", function(e) {
    e.preventDefault();
    var $this = $(this);
    var videoUrl = $this.attr("data-media");
    var popup = $this.attr("href");
    var $popupIframe = $(popup).find("iframe");

    $popupIframe.attr("src", videoUrl);



    var left = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
    var left = left/2 - 340;

    var top = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
    var top = top/2 - 180

    document.getElementById("vid").style.top = top + "px";
    document.getElementById("vid").style.left = left + "px"; 

    $this.closest(".page").addClass("show-popup");
    $('.page iframe').attr("src", '');
});

$(".popup").on("click", function(e) {
    e.preventDefault();
    e.stopPropagation();

    $(".page").removeClass("show-popup");
});

$(".popup > iframe").on("click", function(e) {
    e.stopPropagation();
});

HTML：

<div class="page"> <!-- class "page" is required for video to work-->
        <div class="popup" id="media-popup"> <!-- video embedded -->
            <iframe id="vid" src="http://testvideo.com" width="640" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
        </div><!-- popup -->
</div>