now = new Date(),hour = now.getHours()                                                                                                             if(hour < 6){document.write("凌晨好!")}                                                                                                              
else if (hour < 9){document.write("早上好!")}                                                                                                              
else if (hour < 12){document.write("上午好!")}                                                                                                              
else if (hour < 14){document.write("中午好!")}                                                                                                              
else if (hour < 17){document.write("下午好!")}                                                                                                              
else if (hour < 19){document.write("傍晚好!")}                                                                                                              
else if (hour < 22){document.write("晚上好!")}                                                                                                              
else {document.write("夜里好!")}