求助。。。绑定的时候得不到后台传过来的值

Question

<select id ="selPro" onchange="fun('selCity','123','<%= Cid%>')"><\select>selCity:是绑定市的控件ID
123：是selCity的选中value
<%= Cid%>：后台方法返回的市传过来的区ID为什么 在页面上得不到<%= Cid%>的值

Answer 1

"fun('selCity','123','<%= Cid%>')"
都写到""里面了,被当成字符串了
应该"fun('selCity','123','+"<%= Cid%>+"')"

Answer 2

<select id ="selPro" onchange="fun('selCity','123','<%= Cid%>')"><\select>给select加一个runat="server"属性试试
<select id ="selPro" runat="server" onchange="fun('selCity','123','<%= Cid%>')"><\select>

Answer 3

我加了 runat="server" 了  还是错误