新人菜鸟想求解一个js问题

<i  id="pronumber">
                <%for i = 1 to n%>
                    <a href="<%=filename%>?page=<%=i%>&amp;<%=url%>"><span id="spanhover"><%=i%></span></a>
                <%next%>
            </i>

<script type="text/javascript">

        function getQueryVariable(variable){
            var query = window.location.search.substring(1);
            var vars = query.split("&");
            for (var i=0;i<vars.length;i++) {
                   var pair = vars[i].split("=");
                   if(pair[0] == variable){
                       return pair[1];
                   }
            }
            return(false);
        }            
        var page = getQueryVariable("page"); //提取url链接page后面的数值,赋予page
        
        
        
        
        var spanhover = document.getElementById("spanhover");
        var spans = document.querySelectorAll("#pronumber span");
        function myFun(){
            for( var j=0 ; j<spans.length ; j++ ){
                var spanid = spans[j].innerText;

                if( spanid == page ){
                    spanhover.style.background = "red";
                    spanhover.style.color = "#fff";
                };
            };
        };
        myFun();