Ajax的跨域请求

1）前端Ajax部分代码

function changeClass(){
       $.ajax({
           url: 'http://192.168.1.107:9000/main_page/front/data', //在这里提填写你的地址
           async: false,
           dataType: 'jsonp',
           type:'get',
           jsonp:"callback",     //回调jsonp的前面那个变量的名字
           jsonpCallback:"callback",
           success: function (json_str) {  
               object_js = json_str;
               //document.write(object_js);
               showAllList();
           }
       });
   }

2）后端路由部分代码

@main_page_Blueprint.route('/front/data')
def front_data():
    Class = BaseClass(class_number)
    list_sign_students = Class.list_sign_students
    list_unsign_students = Class.list_unsign_students
    dic_all_students = {}
    for student in list_sign_students:
        dic_all_students[student] = 1
    for student in list_unsign_students:
        dic_all_students[student] = 0
    jsonp = 'callback' + '(' + str(dic_all_students ) + ')'         #主要这里要返回有callback的字符串，不能返回json数据
    return jsonp

3）附加链接，解释json和jsonp的区别

http://kb.cnblogs.com/page/139725/