当文件在HTML中不可用或为空时，请使用HTML中的onemptied 属性执行脚本。
您可以尝试运行以下代码来实现 onemptied 属性-
<!DOCTYPE HTML>
<html>
<body>
<video width = "300" height = "200" controls onemptied ="display()">
<source src = "/html5/foo.ogg" type = "video/ogg" />
Your browser does not support the video element.
</video>
<script>
function display() {
alert ("Sorry! Empty playlist!");
}
</script>
</body>
</html>