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| Section | Objectives |
|---|---|
| Topic 1: Application Lifecycle Management | - Application Development Lifecycle
|
| Topic 2: JavaScript Coding | - JavaScript ES6 Development
|
| Topic 3: Graphics and Animation | - Canvas and SVG
|
| Topic 4: Forms | - HTML5 Forms and Validation
|
| Topic 5: Layouts | - Responsive and Flexible Layouts
|
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질문 # 47
You are creating a script that reads a JSON menu file and displays the Entree, Price, and Description.
Complete the code by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
정답：
설명：
Explanation:
First drop-down: var xhr = new XMLHttpRequest();
Second drop-down: if(xhr.status===200){
Third drop-down: responseObject = JSON.parse(xhr.responseText);
The script must first create an XMLHttpRequest object, so the correct first selection is var xhr = new XMLHttpRequest();. This object performs the asynchronous request for menu.json. After the request finishes, the onload callback executes. The response should be processed only when the request succeeds, so the correct status check is if(xhr.status===200){; HTTP status 200 means the file was successfully retrieved.
Status codes 403, 404, and 500 represent forbidden access, missing resource, and server error conditions, so they are not appropriate for normal JSON processing. The JSON file is returned as plain text through xhr.
responseText, so it must be converted into a JavaScript object with JSON.parse(xhr.responseText). Once parsed, the code can access responseObject.menu[i].Entree, Price, and Description inside the loop and build the display output. responseXML is incorrect because the source file is JSON, not XML.
질문 # 48
Which two functions support 2D transformations in CSS3? Choose 2.
정답：A,C
설명：
The correct 2D transformation functions are matrix() and skew(). CSS transformations are applied through the transform property, which accepts transform functions that can move, rotate, scale, skew, or otherwise alter an element visually in two-dimensional or three-dimensional space. MDN describes the < transform-function > type as representing transformations that affect an element's appearance and can operate in 2D or 3D space.
The matrix() function is valid because it defines a homogeneous two-dimensional transformation matrix, allowing multiple transform effects to be represented in a single function. The skew() function is also valid because it distorts an element along the 2D plane. move() is not a CSS transform function; the standard movement function is translate(). scroll() is not a transform function; scrolling is controlled through overflow and scroll APIs. zoom() is not a CSS3 2D transform function. References/topics: CSS3 transforms, transform property, 2D transformation functions, matrix(), skew().
질문 # 49
You need to call a function named process when a user clicks a button.
Complete the code by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
정답：
설명：
Explanation:
< button onclick= " process() " > Process < /button >
< script >
function process()
{
}
< /script >
The button must use the onclick attribute because the required action occurs when the user clicks the button.
The plain word click is an event name used in JavaScript event listeners, but it is not the correct inline HTML event-handler attribute. The value of the onclick attribute must be process() because the function must actually be invoked when the click event occurs. Using process alone only references the function name and does not call it in this inline markup context. this.process would attempt to reference a property on the current element, and javascript:process is not the correct handler expression. Inside the < script > block, the correct function declaration is function process(). This defines the named function that the button's onclick attribute calls. The final structure therefore connects the button event directly to the script function: when the user clicks Process, the browser runs process().
질문 # 50
Review the markup segment. Which entry will validate successfully according to the required pattern?
정답：C
설명：
The valid entry is A, assuming the OCR-corrupted option represents the intended secret-code format: four letters, a hyphen, two digits, a hyphen, four digits, a hyphen, and four letters. The HTML pattern attribute defines a regular expression that an input value must satisfy during constraint validation. MDN specifies that pattern is used to define a regular expression the input value must match. In the intended pattern, the first group must contain exactly four alphabetic characters, the second group exactly two numeric digits, the third group exactly four numeric digits, and the final group exactly four alphabetic characters. Option A satisfies that structure: kukX is four letters, 04 is two digits, 4938 is four digits, and WJDF is four letters. Option B fails because the final group Uhj6 contains a digit. Option C fails because the first group includes a digit and the digit grouping/hyphen structure is wrong. Option D fails because 23h contains a letter where only digits are allowed. References/topics: HTML5 form validation, pattern attribute, regular-expression validation, text input constraints.
질문 # 51
Which value does the following JavaScript code fragment store in the variable num?
var num = localStorage.length;
정답：C
설명：
The value stored in num is the number of key-value pairs currently stored in localStorage. The localStorage object implements the Web Storage Storage interface, which stores data as named string key/value entries for the current origin. Its length property is read-only and returns the number of data items stored in that Storage object, not the size of the stored data and not the remaining capacity. MDN's Storage reference explicitly defines length as returning the number of data items stored, and its example shows that after three items are added to localStorage, localStorage.length returns 3. Therefore, if the storage area contains five named entries, num receives 5; if it contains no entries, num receives 0. Option A is incorrect because available bytes are not exposed through length. Option B is unrelated to Web Storage. Option C is incorrect because browser storage quota or capacity is separate from the length property. References/topics: Web Storage API, localStorage, Storage.length, key-value storage, application state.
질문 # 52
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