JS跨域请求

下面是一个js跨域请求的小实现

    window._naq = {};//外部调用方法
    _naq.push = function(obj){//obj = {"k":"v","k":"v"}
        var url = nmurl+"?";
        jsonobj = eval(obj);        
        for(var k in jsonobj){
            url += k+"="+jsonobj[k]+"&";
        }
        //url+= "accessLog="+($.cookie("access_log") || 0) +"&userId="+($.cookie("userId") || 0);
        ajax(encodeURI(url));
    }
    function ajax(msg){//请求msg：http://www.xxx.com/a.gif?a=1&b=2...
        var img = new Image();
        if(msg.indexOf("?")>1){
            if (msg.lastIndexOf("&") + 1 == msg.length) {
                img.src = msg + "datetime=" + new Date().getTime();
            }else{
                img.src = msg + "&datetime=" + new Date().getTime();
            }
        }else{
            img.src = msg+"?datetime="+new Date().getTime();
        }
        
    }
    
    //_naq.push({"url":encodeURIComponent(window.location.href),"accessLog":$.cookie("access_log"),"userId":$.cookie("userId")});//默认一次pv
    _naq.push({"pv":"true"});//默认一次pv
    

html页面按照如下方式进行调用

代码片段...<a href="#" onclick="_naq.push({"pv":"true"})">记录一次点击</a>