select隐藏选中值对应的id,显示其它id的简单实现方法

<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>