<FORM METHOD=POST ACTION="" id=form1>
<INPUT TYPE="text" NAME="" value=1>
<INPUT TYPE="text" NAME="" value=2>
<TEXTAREA NAME="" ROWS="" COLS="">12312312</TEXTAREA>
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!--
for (var i=0;i<document.all.form1.elements.length;i++)
{
alert(document.all.form1.elements[i].tagName)
alert(document.all.form1.elements[i].value)
}
//-->
</SCRIPT>
<INPUT TYPE="text" NAME="" value=1>
<INPUT TYPE="text" NAME="" value=2>
<TEXTAREA NAME="" ROWS="" COLS="">12312312</TEXTAREA>
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!--
for (var i=0;i<document.all.form1.elements.length;i++)
{
alert(document.all.form1.elements[i].tagName)
alert(document.all.form1.elements[i].value)
}
//-->
</SCRIPT>
<input name=t1 value=1>
<input name=t2 value=2>
</form><script>
for( var i = 0; i < form1.elements.length; i++ )
alert( form1.elements[i].value );
</script>
<head>
<title></title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script language="javascript">
function check(){
for (var i=0;i<document.forms[0].elements.length;i++){
if (document.forms[0].elements[i].value==""){
alert ("输入不能为空");
event.returnValue=false;
}
}
} </script>
</head>
<body>
<form onsubmit="check()">
<input type="text">
<input type="text" >
<input type="text" >
<input type="text" >
<input type="text" >
<br>
<input type="submit" value="送出" >
</form>
</body>
</html>