<input type="file"><input type="file"><input type="file"><input type="file">
<input type="checkbox"><input type="checkbox"><input type="checkbox"><input type="checkbox">
<input type="radio"><input type="radio"><input type="radio"><input type="radio">
<input type="password"><input type="password"><input type="password"><input type="password">
<SCRIPT LANGUAGE="JavaScript">
var ck = document.getElementsByTagName("input");
var count = 0;
for (var i=0;i<ck.length;i++) if(ck[i].type=="checkbox")count++;
alert(count+"个checkbox")
</SCRIPT>
<input type="checkbox"><input type="checkbox"><input type="checkbox"><input type="checkbox">
<input type="radio"><input type="radio"><input type="radio"><input type="radio">
<input type="password"><input type="password"><input type="password"><input type="password">
<SCRIPT LANGUAGE="JavaScript">
var ck = document.getElementsByTagName("input");
var count = 0;
for (var i=0;i<ck.length;i++) if(ck[i].type=="checkbox")count++;
alert(count+"个checkbox")
</SCRIPT>
<body><form name="f1" method="POST" action="">
<p>
<input type="text" name="aa1" size="12"><input type="text" name="bb1" size="12"><input type="text" name="dd1" size="12" value="1"><input type="text" name="T4" size="12"><input type="text" name="T5" size="12"></p>
<p><input type="text" name="aa2" size="12"><input type="text" name="bb2" size="12"><input type="text" name="dd2" size="12" value="22"><input type="text" name="T9" size="12"><input type="text" name="T10" size="12"></p>
<p><input type="text" name="aa3" size="12"><input type="text" name="bb3" size="12"><input type="text" name="dd3" size="12" value="3"><input type="text" name="T11" size="12"><input type="text" name="T12" size="12"></p>
<p><input type="text" name="aa5" size="12"><input type="text" name="bb5" size="12"><input type="text" name="dd5" size="12" value="4"><input type="text" name="T13" size="12"><input type="text" name="T1" size="12"></p>
</form>
<script>
var all=0
for(var i=0;i<=f1.length-1;i++) //遍历整个表单域的类型
{
n=f1.elements[i].name
if(n.charAt(0)=="d")
{
all+=parseFloat(f1.elements[i].value)
}
}
alert(all)
</script>
</body></html>