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通过jquery动态的设置video src的值无法播放视频?

<div id="video-box">
 <video style="object-fit: fill;width: 200px;height: 50px;" controls>
    <source src="">
  </video>
</div>
<a class="dj" href="javascript:;" data-src="http://www.w3school.com.cn/i/movie.mp4">点击</a> 
*{padding:0;margin:0;}
#video-box{display:none;}
$(".dj").on("click", function() {
   var src = $(this).data("src");
   $("#video-box source").prop("src",src)
   $("#video-box").show();
});

demo在这里https://jsfiddle.net/r9u1cn7o/
作一个通过点击不同的标签弹出弹框播放相应的视屏,但是通过jquery成功的给src赋值了,但是不知道为什么播放不了?


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