<script>
aa.value="";
bb.value="";
or
for(i=0;i<document.all.tagName("INPUT").length;i++){
document.all.tagName("INPUT")[i].value="";
}
</script>
aa.value="";
bb.value="";
or
for(i=0;i<document.all.tagName("INPUT").length;i++){
document.all.tagName("INPUT")[i].value="";
}
</script>
<input type=text>
</form>
<script>
f1.reset();//至于放在哪,根据你的需要定
</script>