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>");