简单模拟路霸请求

function ajaxp(opt) {    var link = document.createElement('script');    link.type="text/javascript";    link.src = opt.url;    if(opt.data && typeof(opt.data) == "object"){        for(var i in opt.data){            link.src += "&"+i+"="+opt.data[i];        }    }    if(opt.callback){        window.success = opt.success;        var createFun = "window."+opt.callback+"=function(data){window.success(data)}";        eval(createFun);    }    document.getElementsByTagName("head")[0].appendChild(link);}ajaxp({    url:"/aaaa",    data:{},    dataType:"json",    callback:"call_success",    success:function(data){        console.log(JSON.stringify(data))    }});

服务器返回：
call_success("{}")