Using JavaScript and JSON in Django (Курс 4)

Where does the following JavaScript code execute?
<p>One Paragraph</p>

 

<script type="text/javascript">

 document.write("<p>Hello World</p>") 

</script> 

 

<p>Second Paragraph</p> 

• In the browser

• On the server

• In the cloud

• Locally on the user's desktop application

What happens when JavaScript runs the alert() function?

• JavaScript execution is paused and a dialog box pops up

• The page reloads

• A new tab opens with the alert message

• JavaScript execution stops permanently

Which of the following is NOT a way to include JavaScript in an HTML document?

• By including the code the <?javascript and ?> tags

• Inside a <script> tag

• External file referenced with <script src="...">

• Inline with an HTML element's event attribute

In the following code, what does the "return false" accomplish?

<a href="js-01.htm" onclick="alert('Hi'); return false;">Click Me</a> 

• It keeps the browser from following the href attribute when "Click Me" is clicked

• It deletes the hyperlink after clicking

• It sends a false value to the server

• It hides the hyperlink

What happens in a normal end user's browser when there is a JavaScript error?

• Nothing except perhaps a small red error icon that is barely noticeable

• The browser crashes

• The webpage turns black

• All JavaScript on the page stops executing

Where can a developer find which line in a web page of JavaScript file is causing a syntax error?

• In the developer console in the browser

• In the status bar of the browser

• In the JavaScript settings menu

• In the page's source code view

What does the following JavaScript do?
console.log("This is a message");

• Puts the message in the browser developer console and continues JavaScript execution

• Sends a message to the server

• Displays a popup window with the message

• Saves the message into a log file

Which of the following is not a valid comment in JavaScript?

• /* This is a comment */

• // This is a comment

• <!-- This is a comment -->

• (* This is a comment *)

Which of the following is not a valid JavaScript variable name?

• 3peat

• _myvar

• $myvar

• myVar

What is the difference between strings with single quotes and double quotes in JavaScript?

• Single-quoted strings do not treat \n as a newline

• Double quotes are used for characters and single quotes for strings

• Single quotes are faster to process

• Double quotes allow for variable interpolation