js执行跨域请求

   //js执行跨域请求
        var _script = document.createElement(‘script‘);
        _script.type = "text/javascript";
        _script.src = "http://api.map.baidu.com/location/ip?ak=Z90WfgUtDDPnr2pfG4yIbkwLEmyoeetx&callback=f";
        document.head.appendChild(_script);

        function f(data){
            alert(data.content.point.y);
        }