<script language="javascript" type="text/javascript">function doSomething(callback) {  // …   // Call the callback  callback('stuff', 'goes', 'here'); // 給callback賦值，callback是個函數變量}function foo1(a, b, c) {  // I'm the callback  alert(a + " " + b + " " + c);}doSomething(foo1); // foo1函數將使用callback函數中的數據 stuff goes herevar foo2 = function(a,b,c) {  // I'm the callback  alert(a + " " + b + " " + c);}doSomething(foo2); // foo2函數將使用callback函數中的數據 stuff goes heredoSomething(function(a,b,c){  alert(a + " " + b + " " + c); // function函數將使用callback函數中的數據 stuff goes here});</script>

<script language="javascript" type="text/javascript">function doSomething(callback) {  // …   // Call the callback  if(typeof callback === 'function'){    callback('stuff', 'goes', 'here'); // 給callback賦值，callback是個函數變量  }else{    alert('VeVB.COm');  }}function foo1(a, b, c) {  // I'm the callback  alert(a + " " + b + " " + c);}doSomething(foo1); // foo1函數將使用callback函數中的數據 stuff goes herevar foo2 = function(a,b,c) {  // I'm the callback  alert(a + " " + b + " " + c);}doSomething(foo2); // foo2函數將使用callback函數中的數據 stuff goes heredoSomething(function(a,b,c){  alert(a + " " + b + " " + c); // function函數將使用callback函數中的數據 stuff goes here});var foo3 = 'a';doSomething(foo3);</script>

$.fn.citySelect=function(settings)

$.fn.citySelect=function(settings, changeHandle) // 添加回調函數changeHandle

//選項變動賦值事件var selectChange = function (areaType) {   if(typeof changeHandle === 'function'){ // 判斷callback是否是函數    var prov_id = prov_obj.get(0).selectedIndex;    var city_id = city_obj.get(0).selectedIndex;    var dist_id = dist_obj.get(0).selectedIndex;    if(!settings.required){      prov_id--;      city_id--;      dist_id--;    };    if(dist_id<0){      var data = {        prov: city_json.citylist[prov_id].p,        city: city_json.citylist[prov_id].c[city_id].n,        dist: null      };    }else{      var data = {        prov: city_json.citylist[prov_id].p,        city: city_json.citylist[prov_id].c[city_id].n,        dist: city_json.citylist[prov_id].c[city_id].a[dist_id].s      };    }    changeHandle(data, areaType); // 返回兩個處理好的數據  }};

// 選擇省份時發生事件prov_obj.bind("change",function(){    cityStart();    selectChange('prov'); // 返回數據});// 選擇市級時發生事件city_obj.bind("change",function(){    distStart();    selectChange('city'); // 返回數據});// 選擇區級時發生事件dist_obj.bind("change",function(){    selectChange('dist'); // 返回數據});

$("#s_city").citySelect({  prov: "江蘇省",  city: "宿遷市",  dist: "宿城區",  nodata: "none"},function(data, type) {  selectAgent(data.city, data.dist);});

function selectAgent(city,district){    $.ajax({      type:"POST",      url:"{sh::U('Index/ajax',array('todo'=>'getagent'))}",      data:"city="+city+"&district="+district,      success:function(json){        json = JSON.parse(json);        opt_str = "<option value=''>-請選擇-</option>"        if(json.status == 1){          $.each(json.data,function(index,con){            opt_str += "<option value="+con.id+">"+con.name+" 電話:"+con.tel+"</option>"          })        }        $('#agent_id').html(opt_str);      }    });}