Microsoft 70-480 Exam Practice Questions (P. 5)
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Question #21
You are creating a JavaScript function that displays the name of a web application.
You declare the following button element.
<input type="button" id= "About" value="About" />
When a user clicks the button, a JavaScript function named About must be called.
You need to create an event handler that calls the About function when the button is clicked.
Which two code segments can you use? (Each correct answer presents a complete solution. Choose two.)
You declare the following button element.
<input type="button" id= "About" value="About" />
When a user clicks the button, a JavaScript function named About must be called.
You need to create an event handler that calls the About function when the button is clicked.
Which two code segments can you use? (Each correct answer presents a complete solution. Choose two.)
Question #22
HOTSPOT -
You are creating a function by using JavaScript. The function accepts an object as the parameter and returns a string that identifies the data type of the object.
You have the following requirements:
✑ The function must return "Number" if the object is a number.
✑ The function must return "String" if the object is a string.
✑ The function must return "Unknown" if the object is neither a number nor a string.
You need to implement the function to meet the requirements.
How should you build the code segment? (To answer, select the appropriate options from the drop-down lists in the answer area.)
Hot Area:
You are creating a function by using JavaScript. The function accepts an object as the parameter and returns a string that identifies the data type of the object.
You have the following requirements:
✑ The function must return "Number" if the object is a number.
✑ The function must return "String" if the object is a string.
✑ The function must return "Unknown" if the object is neither a number nor a string.
You need to implement the function to meet the requirements.
How should you build the code segment? (To answer, select the appropriate options from the drop-down lists in the answer area.)
Hot Area:
Correct Answer:
* Use the switch statement to select one of many blocks of code to be executed.
Syntax -
switch(expression) {
case n:
code block
break;
case n:
code block
break;
default:
default code block
}
This is how it works:
The switch expression is evaluated once.
The value of the expression is compared with the values of each case.
If there is a match, the associated block of code is executed.
* Object.prototype.constructor
Returns a reference to the Object function that created the instance's prototype. Note that the value of this property is a reference to the function itself, not a string containing the function's name. The value is only read-only for primitive values such as 1, true and "test".
* Description
All objects inherit a constructor property from their prototype: var o = {}; o.constructor === Object; // true var a = []; a.constructor === Array; // true var n = new Number(3); n.constructor === Number; // true
* The constructor property is created together with the function as a single property of func.prototype.
Reference: JavaScript Switch Statement;Object.prototype.constructor
* Use the switch statement to select one of many blocks of code to be executed.
Syntax -
switch(expression) {
case n:
code block
break;
case n:
code block
break;
default:
default code block
}
This is how it works:
The switch expression is evaluated once.
The value of the expression is compared with the values of each case.
If there is a match, the associated block of code is executed.
* Object.prototype.constructor
Returns a reference to the Object function that created the instance's prototype. Note that the value of this property is a reference to the function itself, not a string containing the function's name. The value is only read-only for primitive values such as 1, true and "test".
* Description
All objects inherit a constructor property from their prototype: var o = {}; o.constructor === Object; // true var a = []; a.constructor === Array; // true var n = new Number(3); n.constructor === Number; // true
* The constructor property is created together with the function as a single property of func.prototype.
Reference: JavaScript Switch Statement;Object.prototype.constructor
Question #24
You are developing an application that uses a third-party JavaScript library named doWork().
The library occasionally throws an "object is null or undefined" error with an error code of
-2146823281.
The application must:
✑ Extract and handle the exceptions thrown by doWork()
✑ Continue normal program execution if other exceptions occur
You need to implement the requirements.
Which code segment should you use?
The library occasionally throws an "object is null or undefined" error with an error code of
-2146823281.
The application must:
✑ Extract and handle the exceptions thrown by doWork()
✑ Continue normal program execution if other exceptions occur
You need to implement the requirements.
Which code segment should you use?
Question #25
You are troubleshooting a web page that includes the following code. (Line numbers are included for reference only.)
What is displayed in the alert from line 11?
What is displayed in the alert from line 11?
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