php 常用的JS

function doit(){
    var sel_val=$("#type").val();
    if (sel_val==‘‘) {
        $("#bigClassId1").hide();
        $("#bigClassId2").hide();
    }
    if (sel_val==1) {
        $("#bigClassId1").show();
        $("#bigClassId2").hide();
    }
    if (sel_val==2) {
        $("#bigClassId2").show();
        $("#bigClassId1").hide();
    }
}
</script>-->

 <select name="type" id="type"   onchange="doit();">
              <option value="">店铺</option>
              <option value="1">无</option>
              <option value="2">有</option>
            </select>
            <select name="bigClassId" id="bigClassId">
              <option value="">类别</option>
              <?php
                    $rs=query("SELECT id,categoryName FROM tb_easy_category WHERE grade in(1,2) AND categoryId=0 AND state = 0");
                    while($row=fetch_array($rs)){
                        echo "<option value=".$row["id"].">".$row["categoryName"]."</option>";
                    }
                    free_result($rs);
                    ?>
            </select>