原生事件委托

var fn=function(){...}
var callback=function(e){
   if(e.target.tagName==‘li‘){
      fn();
   }
}
    
if(document.attachEvent){
    document.attachEvent("onclick",callback);
}else if(document.addEventListener){
    document.addEventListener("click",callback,false);
}else{
    document[‘onclick‘]=callback;
}

$(document).delegate("li","click",fn);