jquery怎么实现省市区联动的选择功能

<select id="province"></select>
<select id="city"></select>
<select id="district"></select>

//先定义几个省市区数据
var provinceData = [
    { id: '110101', name: '东城区' },
    { id: '110102', name: '西城区' },
    { id: '110105', name: '朝阳区' },
    //...
];

var cityData = [
    { id: '110101', name: '北京市' },
    { id: '110201', name: '天津市' },
    { id: '120101', name: '上海市' },
    //...
];

var districtData = [
    { id: '110101001', name: '东华门街道' },
    { id: '110101002', name: '景山街道' },
    { id: '110101003', name: '交道口街道' },
    //...
];

//动态加载省份数据
$.each(provinceData, function (index, value) {
    $('#province').append('<option value="' + value.id + '">' + value.name + '</option>');
});

//根据省份信息动态加载城市数据
$('#province').on('change', function () {
    var selectProvince = $(this).val();
    $('#city').empty();
    $('#district').empty();
    if (selectProvince === '') {
        $('#city').prop('disabled', true);
        $('#district').prop('disabled', true);
    } else {
        $('#city').prop('disabled', false);
        $('#district').prop('disabled', true);
        $.each(cityData, function (index, value) {
            if (value.id.substring(0, 2) === selectProvince.substring(0, 2)) {
                $('#city').append('<option value="' + value.id + '">' + value.name + '</option>');
            }
        })
    }
});

//根据城市信息动态加载区数据
$('#city').on('change', function () {
    var selectCity = $(this).val();
    $('#district').empty();
    if (selectCity === '') {
        $('#district').prop('disabled', true);
    } else {
        $('#district').prop('disabled', false);
        $.each(districtData, function (index, value) {
            if (value.id.substring(0, 4) === selectCity.substring(0, 4)) {
                $('#district').append('<option value="' + value.id + '">' + value.name + '</option>');
            }
        })
    }
});