javascript访问session

在前台检测session是否有值

<asp:Content ID="Content1" ContentPlaceHolderID="mainContent" runat="Server">

    <% String str = (String)Session["locationlist"]; %>

    <script language="javascript" src="../JScript.js" type="text/jscript">
    </script>

    <script language="javascript" type="text/javascript">
        function checkData() {
            var sloc = "<%=str%>";
            if (...) {
                ...
                return true;
            }
            else
                return false;
        }
    </script>

                    <asp:Button ID="Button1" runat="server" OnClientClick="return checkData();" Text="查  询"
                        OnClick="Button1_Click" />

</asp:Content>

 

BTW :

onclientclick ="return checkData();" 一定要写 return 才能在回传false的时候不执行 onclick的代码；