My JSP 'index.jsp' starting page <Meta http-equiv="pragma" content="no-cache"> <Meta http-equiv="cache-control" content="no-cache"> <Meta http-equiv="expires" content="0"> <Meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <Meta http-equiv="description" content="This is my page">

<select id="sel">
<option value="1">1
<option value="2">2
<option value="3">3

<input type="radio" name="radiobutton" id="uradio1" value="1"> 1
<input type="radio" name="radiobutton" id="uradio2" value="2"> 2
<input type="radio" name="radiobutton" id="uradio3" value="3"> 3

<input type="checkBox" name="checkBox" value="1"> 1
<input type="checkBox" name="checkBox" value="2"> 2
<input type="checkBox" name="checkBox" value="3"> 3
<input type="checkBox" name="checkBox" value="4"> 4
<input type="button" id="ucheck" value="确定">

<input type="checkBox" name="checkItems" id="checkItems" value="全选/全不选"/>全选/全不选


<input type="checkBox" name="items" value="足球"/>足球
<input type="checkBox" name="items" value="篮球"/>篮球
<input type="checkBox" name="items" value="游泳"/>游泳
<input type="checkBox" name="items" value="唱歌"/>唱歌

<form action="">
姓名：<input type="text" id="name"><span id="nameid" style="color:#f00;">姓名不能为空！

年龄：<input type="text" id="age"/><span id="ageid" style="color:#f00;">年龄不能为空！