JSP中的FORM表单中只有一个input文本时，按回车键

<form id="ff" name="ff" method="post"> 
  <input type="text" id="userName" name="userName" size="12" maxlength='30' value="${(data.userName)!''}" onKeypress= "javascript:if(event.keyCode==13) do_postAuditList_search();"/> 
</form> 

<form id="ff" name="ff" method="post"> 
  <input type="text" id="userName" name="userName" size="12" maxlength='30' value="${(data.userName)!''}" onKeypress= "javascript:if(event.keyCode==13) do_postAuditList_search();"/> 
 <!--解决form表单在只有一个input输入框时回车会自动提交表单--> 
 <input style='display:none' /> 
</form>

<form action="" method="post">
<input type="text" name="sdfsdf"/>
<textarea></textarea>
<input type="checkbox">sdfsdf
<input type="hidden" name="aa"/>
</form>

<form action="" method="post">
<input type="text" name="sdfsdf"/>
<input type="text" name="sddf"/></form>

<form action="" method="post">
<input type="text" name="notautosubmit" style="display:none"/>
<input type="text" name="username"/>
</form>

document.onkeypress = function(){
if(event.keyCode == 13) {
search();
return false;
}
}