js 实现回车到下一个空白处
    <script language="javascript"> 
  function changeFocus(){ 
   if(event.keyCode==13 && event.srcElement.type!='submit') 
   event.keyCode=9; 
  } 
  document.onkeydown= changeFocus; 
</script> 
<body> 
<form action="2.jsp"> 
<input type="text" id="name"/> 
<br /> 
<input type="text" id="password"/> 
<br /> 
<input type="submit" value="按钮" /> 
</form> 
</body>