Question

如果当前时间是凌晨5点至中午，我需要打印“早上好”，如果是12点至5点，则需要打印“下午好”，如果是5点至午夜，则需要打印“晚安”，如果要在午夜之间，请告诉别人上床睡觉。和凌晨5点。

错误的短语/时间继续打印

这是我当前的代码：

var today = new Date()
var curHr = today.getHours()

if (curHr < 5) {
  console.log('good morning')
} else if (curHr < 12) {
  console.log('good afternoon')
} else if (curHr < 17) {
  console.log('good evening')
} else {
  console.log('Go to bed')
}

那些说一直有效的人恰好生活在一个可以工作的时区。

Answer 1

您只需要更改if条件。最简单的方法是从最小的数字开始，然后从早上开始。

如果时间是凌晨5点之前，您可以从

开始

currentHour < 5等...

var today = new Date()
var curHr = today.getHours()

if(curHr < 5) {
  console.log('Go to bed')
} else if (curHr < 12){
  console.log('good morning')
} else if (curHr < 17){
  console.log('good afternoon')
} else if (curHr < 24){
  console.log('good evening')
}

始终进行测试：

var timeArray = [1, 8, 15, 23];

for (var i = 0; i < timeArray.length; i++) {

  var curHr = timeArray[i];
  
  if (curHr < 5) {
    console.log('Current Time (' + curHr + '): Go to bed')
  } else if (curHr < 12) {
    console.log('Current Time (' + curHr + '): good morning')
  } else if (curHr < 17) {
    console.log('Current Time (' + curHr + '): good afternoon')
  } else if (curHr < 24) {
    console.log('Current Time (' + curHr + '): good evening')
  }
}

Answer 2

我认为您想根据当前时间打印信息试试这个

var today = new Date()
var curHr = today.getHours()

if (curHr >= 0 && curHr < 6) {
  console.log('What are you doing that early?');
} else if (curHr >= 6 && curHr < 12) {
  console.log('Good Morning');
} else if (curHr >= 12 && curHr < 17) {
  console.log('Good Afternoon');
} else {
  console.log('Good Evening');
}

Answer 3

您还可以跳过范围检查，仅按降序检查最长小时数。

function greeting() {
  var hour = new Date().getHours();
  if (hour >= 17) return /* 05:00 PM + */ 'Good Evening';
  if (hour >= 12) return /* 12:00 PM + */ 'Good Afternoon';
  if (hour >=  6) return /* 06:00 AM + */ 'Good Morning';
  else            return /* 00:00 AM + */  'What are you doing that early?';
}

console.log(greeting());

还有一些高尔夫的代码...

var g = {
  17 : 'Good Evening',                  /* 05:00 PM + */
  12 : 'Good Afternoon',                /* 12:00 PM + */
   6 : 'Good Morning',                  /* 06:00 AM + */
   0 : 'What are you doing that early?' /* 00:00 AM + */ 
}
const f=()=>(h=>g[Object.keys(g).map(x=>parseInt(x,10)).sort((a,b)=>b-a).find(k=>h>=k)])(new Date().getHours());

console.log(f());

如何根据用户时间打印各种短语？

3 个答案: