<select name=\"typeid\" id=\"typeid\">
<option value=\"-1\">-请选择类型-</option>
<option value=\"grade\">兑换等级</option>
<option value=\"money\">兑换现金</option>
<option value=\"gift\">兑换礼物</option>
</select>


<tr id=\"grade\"></tr>

<tr id=\"money\"></tr>


<tr id=\"gift\"></tr>


<script>
$(document).ready(function(){
var alltypes = [\'grade\',\'money\',\'gift\'];
$(\"#typeid\").change(function(){
var type = $(this).val();
for(i=0;i<alltypes.length;i++)
{
$(\"#\"+alltypes[i]).hide();
$(\"#\"+type).show();
}

});
});
</script>