求一个JS的思路
隐藏域里有12,34,39,48,2,33,49,9

这些ID


点击复选框，选中后增加一个，把勾上的取消就会减少一个

例如，我把id是9的打勾的给取消了


怎么让隐藏域里把那个9的给删除掉？？

如果是简单的replace行不通，会把其他带有9的都给干掉了

求一个解决思路

[解决办法]
得到隐藏域
hide = document.getElementById("Hidden1").value
假如
hide = "12,34,39,48,2,33,49,9"
hide = "," + hide + ","

hide = hide.replace(","+"9" + ",",",")