prototype1.5应用--简单的表单提交验证

JAVASCRIPT ::
function aaa(){ 
       if($F('name')==""){ 
              new Element.update("div1","<div>没有输入姓名</div>"); 
              new Field.focus("name"); 
              return false; 
       }else new Element.update("div1",""); 
       if($F('pass')==""){ 
              new Element.update("div2","<div>没有输入密码</div>"); 
              new Field.focus("pass"); 
              return false; 
       }else new Element.update("div2",""); 
       new Form.disable('mf'); 
}
HTML ::
<script language="javascript" src="prototype.js"></script> 
  
<form id="mf"> 
<input type="text" id="name"><div id="div1"></div> 
<input id="pass" type="password"><div id="div2"></div> 
<input type="button" onclick="javascript:aaa();" value="提交"> 
<input type="button" onclick="javascript:new Form.reset('mf');" value="重置"> 
</form