异步请求，跨域

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(function ($) {
    $.rpc = {};

    $.rpc.setup = function (settings) {
        $.extend($.rpc.defaults, settings);
    };
    $.rpc.defaults = {
//        remoteHost:"http://test.wsd.com:8081/catering_oss",
        remoteHost:"http://liao-pc.wsd.com:8080/catering_oss",
        module:"/waiterIpad",
        urlExt:"",
        httpMethod:"get",
        dataType:"jsonp"
    };
    $.rpc.req = function (action, data, cb) {
        var settings = {};
        $.extend(settings, $.rpc.defaults);
        if (typeof action === "object") {
            $.extend(settings, action)
        } else {
            settings.action = action;
        }
        $.ajax({
            url:settings.remoteHost + settings.module + "/" + settings.action + settings.urlExt,
            type:settings.httpMethod,
            dataType:settings.dataType,
            jsonp:'jsoncallback',
            timeout:500,
            error:function (xhr) {
                if ($.isFunction(cb)) {
                    cb(null);
                }
            },
            data:data,
            success:function (data) {
                if ($.isFunction(cb)) {
                    cb(data);
                }
            }
        });

    };
   
    $.fn.showTime = function (tpid) {
        var showTimeFn = function () {
            var today = new Date();
            var hours = today.getHours();
            var minutes = today.getMinutes();
            var seconds = today.getSeconds();
            if (hours < 10) hours = "0" + hours;
            if (minutes < 10) minutes = "0" + minutes;
            if (seconds < 10) seconds = "0" + seconds;
            var timeStr = today.getFullYear() + "-" + today.getMonth() + "-" + today.getDate() + " " + hours + ":" + minutes + ":" + seconds;
            $('#' + tpid).html(timeStr);
        }
        showTimeFn();
        setInterval(showTimeFn, 1000)
    }
})(jQuery);

  调用：

初始化： $.rpc.setup({"module":"","urlExt":".json","remoteHost":"http://test.wsd.com:8081/catering_oss/manager",dataType:"jsonp"});

发送请求
 $.rpc.req("getEmployeeList",{"currentPage":pageIndex+1,"role":role,"staffName":staffName},function(resp){
  var employee={"data":{}};
            for(var key in resp.data.item){
                employee.data[key]=employee.data[key]||{};
                employee.data[key]=resp.data.item[key];
                employee.data[key].source="server";//标识数据来源
            }