asp.net服务器控件调用js <asp:DropDownList id="DropDownList1" runat="server"><asp:ListItem Value="1">11111</asp:ListItem><asp:ListItem Value="2">222222</asp:ListItem></asp:DropDownList><div id="div1">11111</div><div id="div2">22222</div>function change(){//下面这句使用Form1.DropDownList1.value无法得到value,要用getElementById if(document.getElementById ('DropDownList1').value=="1") { div2.style.display = "none"; div1.style.display = "block"; } else { div2.style.display = "block"; div1.style.display = "none"; } }//下面是重点,为DropDownList1控件的onChange事件绑定js的change()函数private void Page_Load(object sender, System.EventArgs e){ DropDownList1.Attributes.Add("onChange", "change();");}