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1.https://www.bilibili.com/video/BV1z64y117b9/?spm_id_from=333.788.recommend_more_video.0
2. https://www.bilibili.com/video/BV1484y1c7uU?p=1
function forumSelected() {
var forumId = $("#forumId").val();
if(forumId == null || '' == forumId) {
alert('請選擇論壇.');
} else {
}
}