第一步添加CSS

/***二级导航前面小圆点***/
.lanse {
    box-sizing: border-box;
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    position: absolute;
    top: 50%;
	margin-left: 10px;
    margin-top: -6px;
    left: 0;
	border-color: #61e1b9;
	border: 3px solid #7a99f2;
}

.lvse {
    box-sizing: border-box;
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    position: absolute;
    top: 50%;
	margin-left: 10px;
    margin-top: -6px;
    left: 0;
	border-color: #61e1b9;
	border: 3px solid #70d7cf;
}
.huangse {
    box-sizing: border-box;
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    position: absolute;
    top: 50%;
	margin-left: 10px;
    margin-top: -6px;
    left: 0;
	border-color: #61e1b9;
	border: 3px solid #f5c745;
}
.hongse {
    box-sizing: border-box;
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    margin-left: 10px;
    margin-top: -6px;
    left: 0;
    border-color: #61e1b9;
    border: 3px solid #f1787f;
}
/***二级导航前面小圆点结束***/

第二部：在菜单添加一下代码

<i class="hongse"></i> //这里的"hongse"对应的是上面CSS样式，一共4个样式，根据自己的爱好可以作相应的调整