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now = new Date(),hour = now.getHours()
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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!")}
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