<html>
<head>
<script language="javascript">
function check()
{
if(form1.aaa.value == ""){return false;}
if(form1.bbb.value == ""){return false;}
return true;
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="default.asp" onsubmit="return check();">
<p>
<input name="aaa" type="text" id="aaa" />
</p>
<p>
<input name="bbb" type="text" id="bbb" />
</p>
<p>
<input type="submit" name="Submit" value="提交" />
</p>
</form>
</body>
</html>那如果是用多个函数对表单进行验证，应当怎么写函数，怎么调用呢？其实也很简单，如下例子：
<html>
<head>
<script language="javascript">
function check1()
{
if(form1.aaa.value == "")
{
return false;
}else{
return true;
}
}
function check2()
{
if(form1.bbb.value == "")
{
return false;
}else{
return true;
}
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="default.asp" onSubmit="return (check1() && check2());">
<p>
<input name="aaa" type="text" id="aaa" />
</p>
<p>
<input name="bbb" type="text" id="bbb" />
</p>
<p>
<input type="submit" name="Submit" value="提交" />
</p>
</form>
</body>
</html>
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