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需要获得 3 Select val
选择 1 门课程 选择 2 门课程日期 选择 3 门课程地点
当我更改选择 1 时,它显示选择 2 和 3
当我尝试获取任何选择值时遇到错误,当我尝试警告 val 出现此消息时,会阻止此页面创建其他对话框