1.       let getTimeState = () => {
    2.                 // 获取当前时间
    3.                 let timeNow = new Date();
    4.                 // 获取当前小时
    5.                 let hours = timeNow.getHours();
    6.                 // 设置默认文字
    7.                 let text = ``;
    8.                 // 判断当前时间段
    9.                 if (hours >= 0 && hours <= 10) {
    10.                     text = `早上好`;
    11.                 } else if (hours > 10 && hours <= 14) {
    12.                     text = `中午好`;
    13.                 } else if (hours > 14 && hours <= 18) {
    14.                     text = `下午好`;
    15.                 } else if (hours > 18 && hours <= 24) {
    16.                     text = `晚上好`;
    17.                 }
    18.                 // 返回当前时间段对应的状态
    19.                 return text;
    20.             };
    21.             alert(getTimeState())