form嵌套问题
form是不能嵌套的，嵌套后会导致第一个form后的数据都不能提交
<form action="form.jsp" id="form1"><input type="text" name="value1" /><form action="12.jsp" id="form2"><input type="text" name="value2" /></form><input type="text" name="value3" /><input type="submit" value="提交" onclick="submitForm();"/></form><script type="text/javascript">function submitForm(){document.getElementById("form1").submit();}</script><form action="form.jsp" id="form1"><input type="text" name="value1" /><input type="text" name="value3" /><form action="12.jsp" id="form2"><input type="text" name="value2" /></form><input type="submit" value="提交" onclick="submitForm();"/></form><script type="text/javascript">function submitForm(){document.getElementById("form1").submit();}</script>