js不能控制层隐藏显示问题

if(selectV=="出售")
{
alert("出售");
document.getElementById("jiage2").style.display="none";
document.getElementById("jiage1").style.display=""}试试是否走了这个分支

解决方案 »

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if(selectV=="出售")
{
alert("出售");
document.getElementById("jiage2").style.display="none";
  document.getElementById("jiage1").style.display=""}这个显示结果也很正确。就是好象selectV值为求购的时候二个层都隐藏了。
设置display为block，不要设置为""，应该你有设置过div的级联样式表中display
为none，设置display为""相当于去掉了display属性，这样会启用级联样式表的样式    function searchleibie(selectV) {
        //var selectV = document.getElementById("leibie").value;
        if (selectV == "") {
            document.getElementById("jiage2").style.display = "none";
            document.getElementById("jiage1").style.display = "block"
        }
        if (selectV == "出售") {
            document.getElementById("jiage2").style.display = "none";
            document.getElementById("jiage1").style.display = "block"
        }
        if (selectV == "求购") {
            document.getElementById("jiage1").style.display = "none";
            document.getElementById("jiage2").style.display = "block"
        }
    }
清一下浏览器缓存看看！！<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default6.aspx.cs" Inherits="Default6" %><!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></title>
    <script type="text/javascript">
        function searchleibie() {
            var selectV = document.getElementById("leibie").value;
            if (selectV == "") {
                document.getElementById("jiage2").style.display = "none";
                document.getElementById("jiage1").style.display = ""
            }
            if (selectV == "出售") {
                document.getElementById("jiage2").style.display = "none";
                document.getElementById("jiage1").style.display = ""
            }
            if (selectV == "求购") {
                document.getElementById("jiage1").style.display = "none";
                document.getElementById("jiage2").style.display = ""
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:DropDownList ID="leibie" runat="server" onchange="searchleibie();">
        <asp:ListItem>出售</asp:ListItem>
        <asp:ListItem>求购</asp:ListItem>
    </asp:DropDownList><br />
    <asp:Image ID="jiage2" runat="server" ImageUrl="~/photo/collapsed.gif"/><br />
    <asp:Image ID="jiage1" runat="server" ImageUrl="~/photo/dele.png" />
    </form>
</body>
</html>没什么问题可以用的！