jQuery启用/禁用显示/隐藏按钮w / SELECT选项。获取剩余的期权值

I have a select list which is being populated using the values from a text field. I also have two buttons: an add button which adds the entered value to the select list and a remove button which removes the entered value from the select list. I would like to do the following using jQuery:I have a select list which is being populated u