Chosen implements three-level linkage function in jQuery

var addressResolve = function (options) {

  //检测用户传进来的参数是否合法

  if (!isValid(options))

    return this;

  //默认参数

  var defaluts = {

    proId: 'pProv',

    cityId: 'pCity',

    areaId: 'pArea'

  };

  var opts = $j.extend({}, defaluts, options);//使用jQuery.extend 覆盖插件默认参数

  var addressInfo = this;

  this.provInfo = $j("#" + opts.proId);//省份select对象

  this.cityInfo = $j("#" + opts.cityId);//城市select对象

  this.areaInfo = $j("#" + opts.areaId);//区县select对象

  /*省份初始化方法*/

  this.provInfoInit = function () {

    var proOpts = "";

    $j.each(provinceJson, function (index, item) {

      proOpts += "<option value=&#39;" + item.ProID + "&#39;>" + item.name + "</option>";

    });

    addressInfo.provInfo.append(proOpts);

    addressInfo.provInfo.chosen(); //初始化chosen

    addressInfo.cityInfo.chosen();//初始化chosen

    addressInfo.areaInfo.chosen();//初始化chosen

  };

  /*城市选择绑定方法*/

  this.selectCity = function () {

    addressInfo.cityInfo.empty();

    addressInfo.cityInfo.append("<option value=选择城市>选择城市</option>");

    addressInfo.areaInfo.empty();

    addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");

    if (addressInfo.provInfo.val() == "选择省份") { //选择无效时直接返回

      addressInfo.cityInfo.trigger("liszt:updated");

      addressInfo.areaInfo.trigger("liszt:updated");

      return;

    }

    var provId = addressInfo.provInfo.val();//获取选择的省份值

    var cityOpts = "";

    $j.each(cityJson, function (index, item) {

      if (item.ProID == provId) {

        cityOpts += "<option value=&#39;" + item.CityID + "&#39;>" + item.name + "</option>";

      }

    });

    addressInfo.cityInfo.append(cityOpts);

    addressInfo.cityInfo.trigger("liszt:updated");

    addressInfo.areaInfo.trigger("liszt:updated");

  };

  /*区县选择绑定方法*/

  this.selectArea = function () {

    if (addressInfo.cityInfo.val() == "选择城市") return;

    addressInfo.areaInfo.empty();

    addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");

    var cityId = addressInfo.cityInfo.val();//获取选择的城市值

    var areaOpts = "";

    $j.each(areaJson, function (index, item) {

      if (item.CityID == cityId) {

        areaOpts += "<option value=&#39;" + item.Id + "&#39;>" + item.DisName + "</option>";

      }

    });

    addressInfo.areaInfo.append(areaOpts);

    addressInfo.areaInfo.trigger("liszt:updated");

  };

  /*对象初始化方法*/

  this.init = function () {

    addressInfo.provInfo.append("<option value=选择省份>选择省份</option>");

    addressInfo.cityInfo.append("<option value=选择城市>选择城市</option>");

    addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");

    addressInfo.provInfoInit();

    addressInfo.provInfo.bind("change", addressInfo.selectCity);

    addressInfo.cityInfo.bind("change", addressInfo.selectArea);

  }

  //私有方法，检测参数是否合法

  function isValid(options) {

    return !options || (options && typeof options === "object") ? true : false;

  }

}