根据当前时间获取问候语

function getTimeGreat() {
    var h = (new Date()).getHours();
    if (h >= 15 && h < 19)
        return "下午好";
    if (h >= 11 && h < 15)
        return "中午好";
    if (h >= 19 && h < 22)
        return "晚上好";
    if (h >= 22 && h <= 24 || h >= 0 && h < 6)
        return "深夜好";
    if (h >= 6 && h < 11)
        return "早上好";
}
document.write(getTimeGreat());