100分求助javascript问题

Question

eval("document.form_name."+urControlName).value=new_value

Answer 1

<script>function inputs(oName)
{
     var o = document.getElementById(oName);
     alert(o.value)
}</script>
<form id=form>
<input name="control_1" type="hidden" value="1"><input name="control_2" type="hidden" value="2"><input name="control_3" type="hidden" value="3">
</form>
<a href="javascript:inputs('control_1')">test</a>

Answer 2

document.form_name.elements[control_name].value=new_valueor
eval("document.form_name."+control_name+".value=new_value")