关键词：innerHTML、span、getElementById
1、放置一个单行标签
<span id="tips"></span>
2、通过innerHTML动态设置span内部元素
<script type="text/javascript">
<%
Object tips = request.getAttribute("tips");
if(tips != null){%>
var tips = '<%=tips %>';
document.getElementById('tips').innerHTML="<font color='red'>"+tips+"</font>";
<%}}%>
</script>