省市县三级联动

                           <div >
                              <label for="user-email" class="am-form-label">收货人地址</label>
                              <div class="am-form-content">
                                  <select name="" id="province" style="width: 200px">
                                      <option class="am-form-label">请选择省</option>
                                      @foreach($sheng as $sh)
                                      <option class="am-form-label" value="{{$sh->id}}">{{$sh->area}}</option>
                                      @endforeach
                                  </select>

                                  <select name="" id="city" style="width: 200px">
                                      <option class="am-form-label" value="{{$sh->id}}">请选择市</option>
                                  </select>

                                  <select name="" id="county" style="width: 200px">
                                      <option class="am-form-label">请选择县</option>
                                  </select>
                              </div>
                          </div>

 //省市县
<script>
    $("#province").change(function (){
        var id = $(this).val();
        getcity("#city",id,"请选择市")
    })
    $("#city").change(function (){
        var id = $(this).val();
        getcity("#county",id,"请选择县")
    })

//写一个公共函数
    function getcity(a,id,city){
        $.get("{{url('Index/shi')}}",{id:id},function (data){
            var str ="<option class='am-form-label'>"+city+"</option>";
            for(var i=0;i<data.length ;i++){
                str += "<option class='am-form-label' value='"+data[i].id+"'>"+data[i].area+"</option>";
            }
            $(a).html(str)
        },"json")
    }
</script>