州と市を実現するためのjsonデータを取得するjqueryメソッド cascading_jquery

<input id="province" list="prvlist" placeholder="省/自治区/直辖市" onblur="changeProvince();"> 
  <datalist id="prvlist"> 
 
  </datalist> 
  <input  id="city" list="citylist" placeholder="市" onblur="changeCity();"> 
  <datalist id="citylist"> 
 
  </datalist> 
  <input  id="area" list="arealist" placeholder="区"> 
  <datalist id="arealist"> 
 
</datalist>

<script> 
    $(function () { 
      getProvince();  //页面打开后，省级下拉列表自动绑定 
    }) 
    //获取省份 
    function getProvince() { 
      var Aid; 
      var Afather; 
      $.get('area_json0.txt', {}, function (data) { 
        for (var i = 0; i < data.length; i++) { 
          if (data[i].fatherId == 0) { 
            Afather += '<option id=" ' + data[i].id + '" value="' + data[i].name + '">'; 
          } 
        } 
        $("#prvlist").append(Afather); 
      } , 'json'); 
    } 
 
    function changeProvince(){ 
      var city; 
      var prv_val=$("#province").val(); 
      getJson(prv_val); 
    } 
    function changeCity(){ 
      var city_val=$("#city").val(); 
      getJsonArea(city_val); 
    } 
    function getJson(Name){ 
      var cityID; 
      $.get('area_json0.txt', {}, function (data) { 
        for (var i = 0; i < data.length; i++) { 
          if (data[i].name == Name) { 
            cityID=data[i].id; 
          } 
        } 
        setCity(cityID); 
      } , 'json'); 
    } 
    function setCity(val){ 
      var Acity; 
      var $listcity=$("#citylist"); 
      $.get('area_json0.txt', {}, function (data) { 
        for (var n = 0; n < data.length; n++) { 
          if (data[n].fatherId == val) { 
            alert(data[n].id); 
            Acity += '<option id=" ' + data[n].id + '" value="' + data[n].name + '">'; 
          } 
        } 
        $listcity.append(Acity); 
      } , 'json'); 
   } 
    function getJsonArea(Name){ 
      var areaID; 
      $.get('area_json0.txt', {}, function (data) { 
        for (var i = 0; i < data.length; i++) { 
          if (data[i].name == Name) { 
            areaID=data[i].id; 
          } 
        } 
        setArea(areaID); 
      } , 'json'); 
    } 
    function setArea(Aval){ 
      var Aarea; 
      var $listarea=$("#arealist"); 
      $.get('area_json0.txt', {}, function (data) { 
        for (var m = 0; m < data.length; m++) { 
          if (data[m].fatherId == Aval) { 
            alert(data[n].id); 
            Aarea += '<option id=" ' + data[m].id + '" value="' + data[m].name + '">'; 
          } 
        } 
        $listarea.append(Aarea); 
      } , 'json'); 
    } 
</script>