js根据当前时间显示问候语

var now = new Date(),hour = now.getHours();

if(hour < 6){return "凌晨好！"}

else if (hour < 9){return "早上好！";}

else if (hour < 12){return "上午好！";}

else if (hour < 14){return "中午好！";}

else if (hour < 17){return "下午好！";}

else if (hour < 19){return "傍晚好！";}

else if (hour < 22){return "晚上好！";}

else {return "夜里好！";}