题目内容

简易版音乐播放器制作，实现下面功能，附件上交作业。-点击下拉：下拉框出现-点击切换歌曲-上下键切换歌曲-点击旁边空白处，下拉框消失-video播放器实现切歌：src属性修改（音乐自己找地址）

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