Salesforce JavaScript-Developer-I 問題集

質問 1：
Refer to the following code:

Which statement should be added to line 09 for the code to display. The boat has a capacity of 10 people?
A. ship.size size;
B. super (size);
C. super.size = size;
D. this.size = size;
正解：D

質問 2：
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string indexvalues, the value of str is 'javascript'. What is the reason for this value:
A. Non-primitive values are mutable.
B. Primitive values are mutable.
C. Non-primitive values are immutable.
D. Primitive values are immutable.
正解：D

質問 3：
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?
A. Class ClothingItem super Item {
B. Class ClothingItem implements Item{
C. Class ClothingItem extends Item {
D. Class ClothingItem {
正解：C

質問 4：
A developer initiates a server with the file server,js and adds dependencies in the source codes package,json that are required to run the server.
Which command should the developer run to start the server locally?
A. node start
B. npm start server,js
C. npm start
D. start server,js
正解：C

質問 5：
A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = 'July';
const year = 2019;
if(year === 2019) {
monthName ='June';
}
Which line edit should be made to make this code run?
A. 02 const year = 2020;
B. 01 let monthName ='July';
C. 03 if (year == 2019) {
D. 02 let year =2019;
正解：B

質問 6：
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:
A. Type
B. Owner
C. Name
D. canTalk
E. Size
正解：A,D,E

質問 7：
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets thisnew requirement?
A. deliveryDate.date = Date.current () + 9;
B. deliveryDate.setDate(( new Date ( )).getDate () +9);
C. deliveryDate.setDate( Date.current () + 9);
D. deliveryDate.date = new Date(+9) ;
正解：B

質問 8：
After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.
The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.
Which two actions will help determine accurate results?
Choose 2 answers
A. The developer should inspect their browser refresh settings.
B. The tester should dear their browser cache.
C. The tester should disable their browser cache.
D. The developer should rework the code.
正解：A,B

質問 9：
In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.
Which two methods areused to address this ?
Choose 2 answers
A. Use the document object instead of the window object.
B. Create a new window object in the root file.
C. Assign variables to the global object.
D. Assign variables to module.exports and require them as needed.
正解：C