使用js控制iframe中的各元素

<script type="text/javascript">
var form=document.getElementById("loginForm");
  if (form.username.value=="")
  { alert("请填写会员名");
   form.username.focus();
   
  }
  if (form.password.value=="")
  { alert("请填写密码");
   form.password.focus();
  
  }
</script>
<iframe src="../../bbs_login.aspx" border="0" height="0" width="0" style="visibility: hidden"></iframe>

 

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