我下载了Jquery UI自动加载，并查找remote-jsonp.html。这是ajax函数，但我打开控制台..在控制台中看不到任何请求…

dataType;“ jsonp”和dataType;“ JSON”之间有什么区别

$( "#city" ).autocomplete({
        source: function( request, response ) {
            $.ajax({
                url: "http://ws.geonames.org/searchJSON",
                dataType: "jsonp",
                data: {
                    featureClass: "P",
                    style: "full",
                    maxRows: 12,
                    name_startsWith: request.term
                },
                success: function( data ) {
                    response( $.map( data.geonames, function( item ) {
                        return {
                            label: item.name + (item.adminName1 ? ", " + item.adminName1 : "") + ", " + item.countryName,
                            value: item.name
                        }
                    }));
                }
            });
        },

参考 http://jqueryui.com/demos/autocomplete/remote-
jsonp.html