*(required) Q: *Describe the difference in result of the JavaScript DOM
methods getElementById and getElementsByClassName.
*2. (required) *Given this JavaScript statement:
*
** objXHR.open('GET',**' HYPERLINK "http://"; http://myURL.com',true**
);**
*
a.* Q:* What, probably, is the type of the object named "objXHR"?
b.* Q: *What is the purpose of each of the parameters being passed
to the "open" method?
*Q: *If an absolute URL is passed in the second argument, what kind of
restriction *usually *applies?
* 3. (required) *How would you *(a) *declare and then *(b) *instantiate a
JavaScript class to describe a "Square" object, taking one argument in its
constructor? The instance of a Square should have sides 4 units in length.
*( c )*What properties might a Square object have and how would they be
coded?
*a.* declare: function Square(numericSideArgument) {
... (some other stuff)
}
*b.* use: var mySquare = new Square(4);
*c.* methods: *perimeter*, coded as "this.perimeter =
numericSideArgument * 4;"
*area*, coded as "this.area =
numericSideArgument ^ 2;" (squared, i.e. width * height)
So, the whole definition of Square would be:
function Square(numericSideArgument) {
this.perimeter = numericSideArgument * 4;
this.area = numericSideArgument ^ 2;
return this;
}
So, *Q: *"mySquare.perimeter" would equal?
*Q: *"mySquare.area" would equal *?*
* 4.* *(desired) *An object called "auto" has an "id" attribute with value
of "taurus" and a "color" attribute with value "blue". Additionally, it has
a child object "radio", which contains an array "knob" which contains three
items with names and shapes:
name: power, shape: round
name: tune, shape: oval
name: scan, shape: square
*Q: *What does the acronym JSON stand for?
*Q: *What does this object look like in JSON?
* BONUS 5.* *(CSS-related)* Describe the difference between a <DIV>
element versus a <SPAN>.
**
* BONUS 6.* *(Advanced JavaScript and YUI)* If I have a JavaScript
collection object "YAHOO.util.Dom" with a member method "setStyle" that
takes three arguments
"an array of element id's"
"a css property name", and
"a single float value",
...*Q: *how would I write the *single *line of JavaScript that sets the
transparency of DIV's "layer1" and "layer2" to "66%"?
*Q:* How would I write the single line of JavaScript that sets the
background color of only DIV "layer1" to hexadecimal "black"?
*Q: *If there was another method which DID take a single-value,
non-array, in that first argument, in object-oriented terminology, the
method would be said to be "what"?
*Q: *Does JavaScript support overloading?
*BONUS 7:* *(Super-impressive)* *Q: *Can you summarize the
definition of "JavaScript enclosures"?
