JS 动态引用JS

 <script type="text/javascript">
 var b= self.setInterval('getip(),1000')

 function getip(){
            loadScript("http://pv.sohu.com/cityjson?ie=utf-8",function(){
                 $("#currIp").html(returnCitySN["cip"])
            });
            
        }
        
 function loadScript(url, callback) {

    var script = document.createElement("script");

    script.type = "text/javascript";

    if (typeof(callback) != "undefined") {

        if (script.readyState) {

            script.onreadystatechange = function() {

                if (script.readyState == "loaded" || script.readyState == "complete") {

                    script.onreadystatechange = null;

                    callback();

                }

            };

        } else {

            script.onload = function() {

                callback();

            };

        }

    };

    script.src = url;

    document.body.appendChild(script);

}

</script>