Perkenalkan fail jquery:

<script src="./jquery-1.11.0.js" type="text/javascript"></script>

Tambahkan kod dalam region.html:

Hantar permintaan ajax melalui $(document).ready(function() {} apabila halaman dimuatkan

<script type="text/javascript">
    $(document).ready(function() {
        //  加載所有的省份
        $.ajax({
            type: "get",
            url: "region_action.php", // type=1表示查詢(xún)省份
            data: {"parent_id": "1", "type": "1"},
            dataType: "json",
            success: function(data) {
                $("#provinces").html("<option value=''>請(qǐng)選擇省份</option>");
                $.each(data, function(i, item) {
                    // alert(item.region_id);
                    $("#provinces").append("<option value='" + item.region_id + "'>" + item.region_name + "</option>");
                });
            }
        });
</script>