JavaScript省市区三级联动实现方案：插件与无插件两种模式

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link href="css/city.css" rel="external nofollow" rel="external nofollow" rel="stylesheet" type="text/css" />
<script src="js/jquery-2.2.0.min.js"></script>
<script src="js/distpicker.data.js"></script>
<script src="js/distpicker.js"></script>
</head>
<body>
<h5>Demo:</h5>
<form class="form-inline">
 <div data-toggle="distpicker">
  <div class="form-group">
   <label class="sr-only" for="province1">Province</label>
   <select class="form-control" id="province1"></select>
  </div>
  <div class="form-group">
   <label class="sr-only" for="city1">City</label>
   <select class="form-control" id="city1"></select>
  </div>
  <div class="form-group">
   <label class="sr-only" for="district1">District</label>
   <select class="form-control" id="district1"></select>
  </div>
 </div>
</form>   
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link href="css/city.css" rel="external nofollow" rel="external nofollow" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/city.min.js"></script>
</head>
<body>
    <div id="content-wrap">   
      <div id="content-left" class="demo">
        <form action="" name="form1">
            <div class="infolist">
              <lable>所在地区：</lable>
              <div class="liststyle">
                <span id="Province">
                  <i>请选择省份</i>
                  <ul>
                    <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" alt="请选择省份">请选择省份</a></li>
                  </ul>
                  <input type="hidden" name="cho_Province" value="请选择省份">
                </span>
                <span id="City">
                  <i>请选择城市</i>
                  <ul>
                    <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" alt="请选择城市">请选择城市</a></li>
                  </ul>
                  <input type="hidden" name="cho_City" value="请选择城市">
                </span>
                <span id="Area">
                  <i>请选择地区</i>
                  <ul>
                    <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" alt="请选择地区">请选择地区</a></li>
                  </ul>
                  <input type="hidden" name="cho_Area" value="请选择地区">
                </span>
              </div>
            </div>
          </form> 
      </div>
      <div id="content-right"></div>
    </div>
</body>
</html>

<!DOCTYPE html>
<html>

  <head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="external nofollow" >
  </head>

  <body>
    <p>&nbsp;</p>
    <div class="row">
      <div class="col-sm-12">
        <div class="form-group">
          <label class="control-label col-sm-2">所在区域</label>
          <div class="col-sm-3">
            <select name="input_province" id="input_province" class="form-control">
            </select>
          </div>
          <div class="col-sm-3">
            <select name="input_city" id="input_city" class="form-control">
            </select>
          </div>
          <div class="col-sm-3">
            <select name="input_area" id="input_area" class="form-control">
            </select>
          </div>
        </div>
      </div>
    </div>
    <p>&nbsp;</p>
    <div class="row text-center">数据来源：
      <a href="http://www.stats.gov.cn/tjsj/tjbz/xzqhdm/201504/t20150415_712722.html" target="_blank">http://www.stats.gov.cn/tjsj/tjbz/xzqhdm/201504/t20150415_712722.html</a>
    </div>
    <script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/1.11.1/jquery.min.js"></script>
    <script src="js/pdata.js" type="text/javascript" charset="utf-8"></script>
    <script type="text/javascript">
      $(function() {
        var html = "<option value=''>== 请选择 ==</option>";
        $("#input_city").append(html);
        $("#input_area").append(html);
        $.each(pdata, function(idx, item) {
          if(parseInt(item.level) == 1) {
            html += "<option value='" + item.name + "' exid='" + item.code + "'>" + item.name + "</option>";
          }
        });
        $("#input_province").append(html);

        $("#input_province").change(function() {
          if($(this).val() == "") return;
          $("#input_city option").remove();
          $("#input_area option").remove();
          var code = $(this).find("option:selected").attr("exid");

          code = code.substring(0, 2);
          var html = "<option value=''>== 请选择 ==</option>";
          $("#input_area").append(html);
          $.each(pdata, function(idx, item) {
            if(parseInt(item.level) == 2 && code == item.code.substring(0, 2)) {
              html += "<option value='" + item.name + "' exid='" + item.code + "'>" + item.name + "</option>";
            }
          });
          $("#input_city").append(html);
        });

        $("#input_city").change(function() {
          if($(this).val() == "") return;
          $("#input_area option").remove();
          var code = $(this).find("option:selected").attr("exid");
          code = code.substring(0, 4);
          var html = "<option value=''>== 请选择 ==</option>";
          $.each(pdata, function(idx, item) {
            if(parseInt(item.level) == 3 && code == item.code.substring(0, 4)) {
              html += "<option value='" + item.name + "' exid='" + item.code + "'>" + item.name + "</option>";
            }
          });
          $("#input_area").append(html);
        });
        //绑定
        $("#input_province").val("山东省");
        $("#input_province").change();
        $("#input_city").val("潍坊市");
        $("#input_city").change();
        $("#input_area").val("诸城市");

      });
    </script>
  </body>
</html>