JavaScript Basics

Which of the following will change the entire body of the HTML on a webpage to the text "Hacked by JavaScript"

• document.innerHTML = "Hacked by JavaScript";

• document.body = "Hacked by JavaScript";

• document.body.innerHTML = "Hacked by JavaScript";

• body = "Hacked by JavaScript";

Which of the following JavaScript commands will change the HTML associated with any id "title" to the text "ECS is Fun".

• document.title.innerHTML = "ECS is Fun";

• document.getElementById("title").innerHTML = "ECS is Fun";

• document.getElementById(title).innerHTML = ECS is Fun;

• document.getElementById("title") = "ECS is Fun";

Which of the following correctly uses a JavaScript variable that is initialized to 42?

• var num = 42;

• num = 42;

• var 42;

• var 42 = num;

Which of the following stores all the HTML elements with the tag h2 into a variable called headings?

• var headings = document.getElementsByTagName("h2");

• var headings = getElementsByTagName("h2");

• var headings = document.getElementsByTagName(h2);

• headings = document.getElementsByTag(h2);

Suppose we have the following JavaScript variable to retrieve all the paragraphs on a webpage:

var paragraphs = document.getElementsByTagName("p");

Which of the following changes the text of the second paragraph to "The second paragraph has been hacked!"

• paragraphs[2] = "The second paragraph has been hacked!";

• paragraphs[1] = "The second paragraph has been hacked!";

• paragraphs[2].innerHTML = "The second paragraph has been hacked!";

• paragraphs[1].innerHTML = "The second paragraph has been hacked!";