極速下載JS-Dev-101權威認證 &考題全覆蓋Salesforce JS-Dev-101

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Salesforce JS-Dev-101 考試大綱：

主題	簡介
主題 1	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
主題 2	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
主題 3	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
主題 4	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
主題 5	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
主題 6	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

>> JS-Dev-101權威認證 <<

最新的 Salesforce Developers JS-Dev-101 免費考試真題 (Q34-Q39):

問題 #34
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing "Leo" to "The Lion"?

A. document.querySelectorAll('#main #Leo').innerHTML = 'The Lion';
B. document.querySelector('#main li:nth-child(1)').innerHTML = 'The Lion';
C. document.querySelectorAll('#main li,Leo').innerHTML = 'The Lion';
D. document.querySelector('#main li:second-child').innerHTML = 'The Lion';

答案：B

解題說明：
We want to select the first <li> under #main and change its content.
document.querySelector(selector) returns the first element matching the CSS selector.
In the DOM, the <li> elements under <ul> are children in order:
1st child: "Leo"
2nd child: "Tony"
3rd child: "Tiger"
li:nth-child(1) is the CSS pseudo-class that selects the first <li> inside its parent.
So:
document.querySelector('#main li:nth-child(1)').innerHTML = 'The Lion'; selects the first <li> ("Leo") inside #main and sets its innerHTML to "The Lion".
Why others are incorrect:
A . #main #Leo
There is no element with id "Leo". id is not set on the <li>, so the selector matches nothing.
B . li:second-child
There is no :second-child pseudo-class. The valid pseudo-class is :nth-child(2); and that would select "Tony", not "Leo".
C . '#main li,Leo'
This selector means "all #main li and all elements named <Leo>".
There is no <Leo> tag, and querySelectorAll returns a NodeList, which does not have a single innerHTML property.
Therefore, D is the correct statement.
Study Guide Concepts:
document.querySelector vs querySelectorAll
CSS selectors: nth-child()
DOM element innerHTML property

問題 #35
Console logging methods that allow string substitution:

A. message
B. log
C. error
D. info
E. assert

答案：B,C,D

問題 #36
Refer to the code below:

Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?

A. 0
B. 1
C. 2
D. 3

答案：A

問題 #37
The developer wants to test the array shown:
const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ?
Choose 2 answers:

A. console.assert(arr[0] === 0 && arr[ arr.length] === 0);
B. console.assert( arr.length === 5 );
C. console.assert (arr.length >0);
D. arr.forEach(elem => console.assert(elem === 0)) ;

答案：B,D

問題 #38
Given the following code:

What will be the first four numbers logged?

A. 0122
B. 0123
C. 0012
D. 0112

答案：A

問題 #39
......

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極速下載JS-Dev-101權威認證 &考題全覆蓋Salesforce JS-Dev-101

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Salesforce JS-Dev-101 考試大綱：

最新JS-Dev-101考古題 - JS-Dev-101考題

最新的 Salesforce Developers JS-Dev-101 免費考試真題 (Q34-Q39):

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