jquery定时器调用函数时传参

jquery 定时器 调用函数时传参
var li&＃61;$(&＃39;.first>li:first-child&＃39;);
var index&＃61;0;
var s&＃61;$(&＃39;.first>li&＃39;);
function gundong(a,b){
// console.log(b.length);
index&＃43;&＃43;;
if(index>b.length-4){
index&＃61;0
}
a.animate({marginTop:-35*index&＃43;"px"});
}

var sto &＃61; setInterval;
window.setInterval &＃61; function(callback,timeout,param){
var args &＃61; Array.prototype.slice.call(arguments,2);
var _cb &＃61; function(){
callback.apply(null,args);
};
sto(_cb,timeout);
};
var first&＃61; setInterval(gundong,4000,li,s);