<td id="alertMessage" title='<s:property value="#bean.fldAlertMessage" />' >
	<script type="text/javascript">
		var oldMessage = $("#alertMessage").attr("title");
		var newMessage = null;
		if(oldMessage.length > 21){
			newMessage = oldMessage.substring(0,21) + "...";
		}else{
			newMessage = oldMessage
		}
		document.write(newMessage);//输出变量
	</script>
</td>

?在jsp中循环烈表时，想截取字符串可以使用这种方式