换一换js

(function(){

var tit = $("#changes"),

con = $("#wday>ul"),

page = con.length,
        index = 0;

tit.click(function(){
            if(index < page){
                index++;
            }else{
                index = 0;
            }
          con.eq(index).show().siblings().hide();
      });

})();

换一换js