js switch語(yǔ)句的嵌套使用技巧

js
小樊
81
2024-10-16 06:57:04

在 JavaScript 中，可以在一個(gè) switch 語(yǔ)句內(nèi)部嵌套另一個(gè) switch 語(yǔ)句。這種嵌套的使用技巧可以讓你的代碼更加模塊化和易于維護(hù)。以下是一些建議和技巧：

  1. 將相關(guān)的邏輯放在一起：嵌套 switch 語(yǔ)句可以讓你將與特定條件相關(guān)的邏輯組合在一起，使代碼更易于閱讀和理解。

  2. 使用有意義的命名：為每個(gè) case 和嵌套的 switch 語(yǔ)句提供有意義的名稱，以便于理解代碼的意圖。

  3. 保持簡(jiǎn)潔：盡量避免過(guò)深的嵌套，以保持代碼的可讀性。如果嵌套層數(shù)過(guò)多，可以考慮將部分邏輯提取到函數(shù)中。

  4. 使用默認(rèn)情況：在每個(gè) case 和嵌套的 switch 語(yǔ)句中添加默認(rèn)情況，以處理可能未覆蓋到的值。

下面是一個(gè)嵌套 switch 語(yǔ)句的示例：

function getDayOfWeek(dayNumber) {
  let dayOfWeek;

  switch (dayNumber) {
    case 0:
      dayOfWeek = 'Sunday';
      break;
    case 1:
      dayOfWeek = 'Monday';
      break;
    case 2:
      dayOfWeek = 'Tuesday';
      break;
    case 3:
      dayOfWeek = 'Wednesday';
      break;
    case 4:
      dayOfWeek = 'Thursday';
      break;
    case 5:
      dayOfWeek = 'Friday';
      break;
    case 6:
      dayOfWeek = 'Saturday';
      break;
    default:
      dayOfWeek = 'Invalid day number';
  }

  return dayOfWeek;
}

function getWeekInfo(weekNumber) {
  let weekInfo;

  switch (weekNumber) {
    case 1:
      weekInfo = 'Week 1';
      break;
    case 2:
      weekInfo = 'Week 2';
      break;
    case 3:
      weekInfo = 'Week 3';
      break;
    case 4:
      weekInfo = 'Week 4';
      break;
    default:
      weekInfo = 'Invalid week number';
  }

  return weekInfo;
}

function getDayInfo(dayNumber, weekNumber) {
  const dayOfWeek = getDayOfWeek(dayNumber);
  const weekInfo = getWeekInfo(weekNumber);

  switch (dayOfWeek) {
    case 'Sunday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    case 'Monday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    case 'Tuesday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    case 'Wednesday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    case 'Thursday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    case 'Friday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    case 'Saturday':
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
    default:
      return `Today is ${dayOfWeek}, ${weekInfo}.`;
  }
}

console.log(getDayInfo(3, 2)); // Output: Today is Wednesday, Week 2.

在這個(gè)示例中，我們使用了嵌套的 switch 語(yǔ)句來(lái)根據(jù)輸入的星期幾和周數(shù)獲取對(duì)應(yīng)的星期信息。這種結(jié)構(gòu)使得代碼更加模塊化和易于維護(hù)。

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