JavaScript (JS) and CSS can be used to create a計算器 that can be easily accessed from a web page. This計算器 can be used to perform various mathematical operations, such as addition, subtraction, multiplication, and division.

To create a basic計算器， the following steps should be followed:

1. 加載JavaScript和CSS

The first step is to load the JavaScript and CSS files on the web page. The CSS file can be used to style the計算器的外觀 and the JavaScript file can be used to implement the計算器的功能.

2. 編寫JavaScript代碼

The JavaScript code responsible for creating the計算器 is written in a language such as JavaScript, HTML, and CSS. The code will be used to create the buttons, input fields, and the overall計算器 structure.

3. 創建按鈕和輸入框

The buttons and input fields used in the計算器 are created using HTML. The buttons should be displayed on the screen and have the appropriate classnames to make them look like a button. The input fields should be displayed in a text area and have the appropriate classnames to make them look like a text area.

4. 編寫JavaScript代碼

The JavaScript code responsible for adding the functionality of the計算器 is written in a language such as JavaScript, HTML, and CSS. The code will be used to perform the various mathematical operations on the user's input and to update the user's display with the result of the operation.

5. 實現功能

The final step is to implement the various functions of the計算器. These functions can include adding, subtracting, multiplying, and dividing numbers, as well as displaying the results on the screen.

Overall, using JavaScript and CSS to create a計算器 is a simple and easy process that can be easily adapted to perform various mathematical operations. With the right code, a計算器 can be easily created and made available to the user.