先試後買

A. Change the substring method call to substr()

B. Change the characterAt method call to characterat

C. Change the substring method call to substr

D. Change the characterAt method call to charAt

A. You can use a single instance of the form object to represent multiple forms on a Web page.

B. The JavaScript form object has no relationship to the X/HTML <form> element.

C. The form object cannot be used to access the individual field elements that compose the form.

D. The JavaScript form object is available when the X/HTML <form></form> tags are present in the X/HTML document.

A. x = 10; y = 5; x <= y;

B. x = 10; y = 5; x == y;

C. x = 10; y = 5; x !== "X"

D. x = 10; y = 5; x === y;

A. Certain JavaScript functionality may be blocked by some browsers, which prevents the script from running as expected for all users.

B. JavaScript cannot be disabled in the client and will always run.

C. JavaScript is a cross-platform scripting language and will generate consistent results regardless of the client or server being used.

D. JavaScript functionality is immune to viruses, trojans and malware.

A. prompt("What is your name?", "" + alert("Welcome, "));

B. prompt("What is your name?", "") + alert("Welcome, ");

C. alert("Welcome, ") + prompt("What is your name?", "");

D. alert("Welcome, " + prompt("What is your name?", ""));

A. Modify database security permissions, including changing the database owner

B. Update the database schema and table relationships

C. Retrieve information from a database and display it back to the page originating the request

D. Create custom database views and stored procedures