将$('#test')改为$('#test li')鼠标移到列表项上才触发后面的函数
同时.on('mouseenter',‘li’function(e) {)}修改为.on('mouseenter',function(e){})
分开写,前面是$('#test li').on("mouseenter",function(e){sub.removeClass("none")}),
后面是$("#text").on("mouseenter","li",function(e)