function check()
{
var i;
var name;
for(i = 1; i <= 7; i ++)
{
name = "a0"+i;
if (document.all(name).value == "")
{
alert('各项均不能为空');
form.name.focus();
return false;
}
}
}
{
var i;
var name;
for(i = 1; i <= 7; i ++)
{
name = "a0"+i;
if (document.all(name).value == "")
{
alert('各项均不能为空');
form.name.focus();
return false;
}
}
}
<form name="frm1" onSubmit="return check()">
<input type="text" name="aa"><br>
<input type="text" name="aa"><br>
<input type="text" name="aa"><br>
<input type="text" name="aa"><br>
<input type="text" name="aa"><br>
<input type="text" name="aa"><br>
<input type="text" name="aa"><br>
<input type="submit">
</form>
<SCRIPT LANGUAGE="JavaScript">
function check()
{
for(i = 0; i < document.frm1.aa.length; i++)
{
if (frm1.aa[i].value == "")
{
frm1.aa[i].focus();
alert("第" + (i + 1) + "个文本框是空的!");
return false;
}
}
}
</SCRIPT>
if (form.elements[i].value == "")
alert("第" + (i + 1) + "个文本框是空的!");
return false;
}