CIW 1D0-635 問題集

質問 1：
Which statement is true about the getElementByID() method?
A. It returns an array containing all elements with the specified ID.
B. If a match is not found for the specified ID, it will attempt searching by name.
C. It returns only the first element with the specified ID.
D. If a match is not found for the specified ID, it will attempt searching by tag name.
正解：C

質問 2：
Consider the following code:

Which statement could be used to determine the value of the first radio button?
A. document.getElementById(rdoGroup1).value
B. document.rdoGroup1.value
C. document.getElementById("rdoGroup1").value
D. document.myForm.rdoGroup1[0].value
正解：D

質問 3：
Suppose you define two variables as follows:
var x = 5;
var y = "5";
Which statement will return the mathematical sum of these variables?
A. alert((int)x + (int)y);
B. alert(x + int(y));
C. alert(x + y);
D. alert(x + parseInt(y));
正解：D

質問 4：
Which choice best defines events and event handlers?
A. An event can be an action initiated by the user, and an event handler specifies how JavaScript will react to the action.
B. An event handler can be an action initiated by the user, and an event specifies how JavaScript will react to the action.
C. An event is initiated by an error in JavaScript, and an event handler will attempt to bypass the error and continue.
D. An event is an action initiated by the operating system, and an event handler is a function defined by the user.
正解：A

質問 5：
What is the purpose of the prototype property in JavaScript?
A. It returns a list of properties and methods of a JavaScript object.
B. It enables developers to create JavaScript code from a specially formatted prototype flowchart document.
C. It is used to add properties or methods to a JavaScript object.
D. It is used to create usage examples of custom objects because its output is not evaluated by the JavaScript interpreter.
正解：C

質問 6：
Consider the following code:

When an invalid e-mail address is entered, an alert is displayed to the user, but the form submission is not interrupted. What changes need to be made to the script in order to abort the submission if an invalid e-mail address is entered?
A. Add return false after the alert() statement.
B. Add validate false after the alert() statement.
C. Change return to validate in the function call.
D. Remove the return keyword from the function call and put it in front of the alert() statement.
正解：A