js ?callback回调的一种写法

getLocation.cityname(latitude, longitude, function (data1) {SetCityCallBack(data1);});

var getLocation = { ???????cityname: function (latitude, longitude, callback) { ???????????$.ajax({ ???????????????url: ‘http://api.map.baidu.com/geocoder/v2/?ak=es2Cuviaa2zdKUjtxjq8t5wn&callback=renderReverse&location=‘ + latitude + ‘,‘ + longitude + ‘&output=json&pois=1‘, ???????????????type: "get", ???????????????dataType: "jsonp", ???????????????jsonp: "callback", ???????????????success: function (data) { ???????????????????console.log(data); ???????????????????var province = data.result.addressComponent.province; ???????????????????var cityname = (data.result.addressComponent.city); ???????????????????var district = data.result.addressComponent.district; ???????????????????var street = data.result.addressComponent.street; ???????????????????var street_number = data.result.addressComponent.street_number; ???????????????????var formatted_address = data.result.formatted_address; ???????????????????localStorage.setItem("province", province); ???????????????????localStorage.setItem("cityname", cityname); ???????????????????localStorage.setItem("district", district); ???????????????????localStorage.setItem("street", street); ???????????????????localStorage.setItem("street_number", street_number); ???????????????????localStorage.setItem("formatted_address", formatted_address); ?????????????????????????????????data2 = { ???????????????????????latitude: latitude, ???????????????????????longitude: longitude, ???????????????????????cityname: cityname, ???????????????????????province: province ???????????????????}; ???????????????????if (typeof callback == "function") { ???????????????????????callback(data2); ???????????????????} ???????????????} ???????????}); ???????}, ???} ???function SetCityCallBack(obj) ???{ ???????$(".app_titles span").eq(0).find("a").html(obj.cityname); ???????$(".mui-table-view").append(‘<li class="mui-table-view-cell" id="city"><a href="#" id="acity" style="color: #999999">‘ + obj.cityname + ‘</a></li>‘); ???????GetArea(obj.cityname, obj.province); ???????GetShopListInfo(1, obj.latitude, obj.longitude, obj.cityname, "", "", obj.province); ???}