在javascript中創建條件

我是 JavaScript 新手，我創建了這個條件來檢查季節是Autumn、Winter、Spring還是Summer。

這是我的 JavaScript 代碼：

1. 我的問題是如何在更少的代碼行中做到這一點

2. 如何在同一代碼中同時使用大寫和小寫，例如：October和october

    const seasonName = prompt('entere the month name')
   
    if (seasonName == 'september') {
    console.log("The Season is Autumn.")
    }
    else if (seasonName == 'october') {
    console.log("The Season is Autumn.")
    }
    else if (seasonName == 'november') {
    console.log("The Season is Autumn.")
    }
    else if (seasonName == 'december') {
    console.log("The Season is Winter.")
    }
    else if (seasonName == 'january') {
    console.log("The Season is Winter.")
    }
    else if (seasonName == 'february') {
    console.log("The Season is Winter.")
    }
    else if (seasonName == 'march') {
    console.log("The Season is Winter.")
    }
    else if (seasonName == 'april') {
    console.log("The Season is Spring.")
    }
    else if (seasonName == 'may') {
    console.log("The Season is Spring.")
    }
    else if (seasonName == 'june') {
    console.log("The Season is Summer.")
    }
    else if (seasonName == 'july') {
    console.log("The Season is Summer.")
    }
    else if (seasonName == 'august') {
    console.log("The Season is Summer.")
    }
   

uj5u.com熱心網友回復：

我喜歡采用以下方法：

const seasonsByMonth = {
   'january': 'winter',
   'february': 'winter',
   ' march': 'winter',
   'april': 'spring',
   ...
}
const seasonName = prompt('entere the month name');
console.log(`The Season is ${seasonsByMonth[seasonName.toLowerCase()]}.`)

uj5u.com熱心網友回復：

你可以使用switch陳述句。代碼是這樣的：

switch(seasonName) {
    case "september":
    case "october":
    case "november":
        console.log("The Season is Autumn.");
        break;
    case "december":
    case "january":
    case "february":
        console.log("The Season is Winter.");
        break;
    case "march":
    case "april":
    case "may":
        console.log("The Season is Spring.");
        break;
    case "june":
    case "july":
    case "august":
        console.log("The Season is Summer.");
        break;
}

uj5u.com熱心網友回復：

您可以將它們分配為物件并使用鍵值對來檢索

// add your months as objects
const seasonObj = {
Autumn: ["september", "october", "november", ],
Spring: ["april", "may"],
summer: ["june", "july", "august"],
Winter: ["december", "january", "february", "march"]
}

function getSeason(value) {
for (const [key, val] of Object.entries(seasonObj)) {
  if(val.includes(value))
  {
  return `the Season is ${key}`
  }
}
}
const result = getSeason("april");
console.log(result)

uj5u.com熱心網友回復：

用更少的代碼行試試這個，

 const seasonName = prompt('entere the month name')

 let obj = {
   'summer': ['august', 'july', 'june'],
   'spring': ['may', 'april'],
   'winder': ['march', 'february', 'january'],
   'autumn': ['september', 'october', 'november']
 }

 function findSeason(seasonName) {
   let result = 'Invalid Month Name'

   let keys = Object.keys(obj)

   for (let i = 0; i < keys.length; i  ) {
     for (let j = 0; j < obj[keys[i]].length; j  ) {
       if (seasonName === obj[keys[i]][j]) {
         result = `The Season is ${keys[i]}`
       }

     }
   }

   return result
 }




 console.log(findSeason(seasonName.toLowerCase()))

uj5u.com熱心網友回復：

我正在使用 JavaScript 內置函式“包含”來檢查字串是否存在于陣列中

const winterMonthName = ['January', 'February', 'December', 'january', 'february', , 'december'];
const springMonthName = ['March', 'April', 'May', 'march', 'april', 'may']
const summerMonthName = ['June', 'July', 'August', 'june', 'july', 'august']
const autumnMonthName = ['September', 'October', 'November', 'september', 'october', 'november']
const type = 'July';

if(winterMonthName.includes(type)){
  console.log('The Season is Winter')
}
else if(springMonthName.includes(type)){
  console.log('The Season is Spring')
}
else if(summerMonthName.includes(type)){
  console.log('The Season is Summer')
}
else if(autumnMonthName.includes(type)){
  console.log('The Season is Winter')
}
else {
  console.log('You entered wrong')
}

uj5u.com熱心網友回復：

const seasonName = prompt('entere the month name')

const seasonNameLowercase = seasonName.toLowerCase();

 if (seasonNameLowercase == 'september') {
 console.log("The Season is Autumn.")
 }
 else if (seasonNameLowercase == 'october') {
 console.log("The Season is Autumn.")
 }
 else if (seasonNameLowercase == 'november') {
 console.log("The Season is Autumn.")
 }
 else if (seasonNameLowercase == 'december') {
 console.log("The Season is Winter.")
 }
 else if (seasonNameLowercase == 'january') {
 console.log("The Season is Winter.")
 }
 else if (seasonNameLowercase == 'february') {
 console.log("The Season is Winter.")
 }
 else if (seasonNameLowercase == 'march') {
 console.log("The Season is Winter.")
 }
 else if (seasonNameLowercase == 'april') {
 console.log("The Season is Spring.")
 }
 else if (seasonNameLowercase == 'may') {
 console.log("The Season is Spring.")
 }
 else if (seasonNameLowercase == 'june') {
 console.log("The Season is Summer.")
 }
 else if (seasonNameLowercase == 'july') {
 console.log("The Season is Summer.")
 }
 else if (seasonNameLowercase == 'august') {
 console.log("The Season is Summer.")
 }

標籤：javascriptif 语句条件语句

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