video 标签制定了 show-casting-button 属性，展示了投屏按钮

点击完，选择好电视之后，就直接显示投屏失败

试了两个电视都这样，麻烦官方查一下，影响了很多用户了，我们有一些舞蹈教学视频，需要使用投屏

拉了一下事件信息，麻烦尽快查一下吧

bindcastingstatechange--------

{"type": "castingstatechange", "timeStamp": 3498, "target": {"id": "video-9839", "offsetLeft": 0, "offsetTop": 0, "dataset": {"id": 9839}}, "currentTarget": {"id": "video-9839", "offsetLeft": 0, "offsetTop": 0, "dataset": {"id": 9839}}, "mark": {}, "detail": {"viewId": 839915200, "state": "fail"}, "mut": false, "_userTap": false, "__evName": "castingstatechange"}

------------ {"type": "error", "timeStamp": 12755, "target": {"id": "video-9839", "offsetLeft": 0, "offsetTop": 0, "dataset": {"id": 9839}}, "currentTarget": {"id": "video-9839", "offsetLeft": 0, "offsetTop": 0, "dataset": {"id": 9839}}, "mark": {}, "detail": {"errMsg": ""}, "mut": false, "_userTap": false, "__evName": "error"}