日期:2014-05-18 浏览次数:21343 次
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
    <script type="text/javascript">
    function setList(){
        var lists=document.getElementsByTagName("select");
        for(var i=0;i<lists.length;i++){
            lists[i].selectedIndex=1;
        }
    }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server">
        <asp:ListItem Value="1" Text="1" />
        <asp:ListItem Value="2" Text="2" />
        <asp:ListItem Value="3" Text="3" />
        <asp:ListItem Value="4" Text="4" />
        </asp:DropDownList>
        <asp:DropDownList ID="DropDownList2" runat="server">
        <asp:ListItem Value="1" Text="1" />
        <asp:ListItem Value="2" Text="2" />
        <asp:ListItem Value="3" Text="3" />
        <asp:ListItem Value="4" Text="4" />
        </asp:DropDownList>
        <asp:DropDownList ID="DropDownList3" runat="server">
        <asp:ListItem Value="1" Text="1" />
        <asp:ListItem Value="2" Text="2" />
        <asp:ListItem Value="3" Text="3" />
        <asp:ListItem Value="4" Text="4" />
        </asp:DropDownList>
        <input id="Button1" type="button" value="button" onclick="setList()" />
    </div>
    </form>
</body>
</html>