js 获取后台数据

【后台】
public string s="hello";

【前台】
alert(' <%=s%>');

代码实例：下面是一段分页的脚本代码，不过不提供分页功能只是呈现页数，页码，后台字段数据是：tpid，xm，pagecount，xcm

<script type="text/javascript">
        var tpid = new Array();
        var xm = new Array();
        var j = 2;
        tpids = "<%=tpid%>";
        xms = "<%=xm%>";
        pagecount = "<%=pagecount%>";
        xcm = "<%=xcm%>";
       
        tpid = tpids.split(",");
        xm = xms.split(",");
        document.write('<marquee width="100%" behavior="scroll" direction="left" align="middle" border="0px" scrolldelay="250px">欢迎你浏览&nbsp;&nbsp;相册——'+xcm+'</marquee></div>');
        document.write("<div id='page_1' style='display:block' >");
        for (var i = 0; i < tpid.length; i++) {

            document.write('<img class="imgsrc" src=Handler.ashx?ImID=' + tpid[i] + ' alt="' + xm[i] + '" />');
            if ((i + 1) % 8 == 0 && i + 1 != pagecount) {
                document.write('</div><div id=page_' + j + ' style="display:none" >');
                j++;
            }
        }

        document.write("</div>");
        document.write("<div style='color: #fff; text-align:center' id='showys' >第1页,共" + pagecount + "页</div>");