
 废话少说 直接上代码 代码是程序员交流的最好方式 哈哈: 
 代码如下: 
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 
<% 
String path = request.getContextPath(); 
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 
%>    
 My JSP 'index.jsp' starting page       --> 
 script>  
function selectChange(obj){ 
var value=obj.value; 
var v1 = document.getElementById("tr1"); 
var v2 = document.getElementById("tr2"); 
if(value==0){ 
console.log("two is hidden"); 
v1.style.display="none"; 
v2.style.display="none"; 
}else if(value==1){ 
v1.style.display="block"; 
v2.style.display="none"; 
}else{ 
v1.style.display="none"; 
v2.style.display="block"; 
//将里面的值设为空 
} 
} 
 script>  
 
 
 
 
   实现效果如下: 
