鬧鐘介面

？ ‍？ 為初學者解釋類別和 ID

在 HTML 和 CSS 中引入 類別 和 ID 時，分解它們的目的、差異和實際用例會很有幫助。以下是基於鬧鐘介面程式碼的逐步說明。

？ 什麼是類別和 ID？

1. 類別 和 ID 是用來命名和識別 HTML 中的元素的屬性。
2. 它們可協助您使用 CSS 或 JavaScript 將特定樣式或功能套用到元素。

1️⃣ 課程（class）

• 用途：用於設定共享相同樣式或行為的多個元素的樣式。
• HTML 語法:>
• CSS 語法: .name-of-class { property: value; }
• 程式碼範例：

  <div>



<p><strong>Explanation</strong>:</p>

• The container class wraps the whole interface.
• The set-alarm class applies styling to the section where users set alarms.
• The set-button class styles the "Set Alarm" button.

? Why Use Classes?

• You can reuse the same class for multiple elements.
• Makes your code more organized and efficient.

? Example of Reusability:

If you want to style multiple buttons similarly, you can give them the same class:

<button>



<p>And style them with:<br>
</p>

<pre class="brush:php;toolbar:false">.set-button {
  background-color: #4CAF50;
  color: white;
  padding: 10px;
}

2️⃣ ID (id)

• 用途：用於唯一標識單一元素。
• HTML 語法:>
• CSS 語法: #unique-name { property: value; }
• 程式碼範例：

  <input type="time">



<p><strong>Explanation</strong>:</p>

• The>
• IDs should not be reused within the same HTML document.

? Why Use IDs?

• IDs are for elements that need unique identification, such as form fields or sections you want to target specifically.
• Useful for JavaScript interactions.

? Key Differences Between Classes and IDs

?️ Practical Analogy

Imagine a classroom:

• Class: Like giving students the same uniform color. Anyone wearing the same uniform belongs to that class group.
• ID: Like giving each student a unique student ID card.

In code, classes are like uniforms for elements with similar styles, while IDs are unique identifiers for specific elements.

? Interactive Exercise

Ask beginners to:

1. Add a New Button: In the HTML, add another button for canceling the alarm.

   <button>



<ol>
<li>
<strong>Style the Buttons Differently</strong>: Update the CSS to give each button a unique background color by using both classes and IDs.
</li>
</ol>

<pre class="brush:php;toolbar:false">   .set-button {
     padding: 10px 20px;
     color: white;
     border: none;
     border-radius: 5px;
   }

   #set-alarm {
     background-color: green;
   }

   #cancel-alarm {
     background-color: red;
   }

此練習有助於強化使用 類 進行一般樣式設定以及使用 ID 進行獨特案例的概念。

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