Deferredを用いたajax共通オブジェクト

http.js

var getData = function (query) {
    var param = {
        url: 'http://hoge',
        data: {
            userId : 'hoge'
            query: query,
        },
        dataType: 'json'
    }
    //success
    Http.get(param).done(function(data) { 
        console.log(data);
    });
    //fail
    Http.get(param).fail(function(data) {
        console.log('fail');
    });
}

//common
var Http = {
    var defer = $.Deferred();
    get : function (param) {
        $.ajax({
            url: param.url,
            data: param.data || '',
            dataType: param.dataType || '',
            success: defer.resolve,
            error: defer.reject
        });
        return defer.promise();
    }
}