What does the following code snippet do?

<input type="radio" name="r1" value="radio1" onclick="this.checked=false;alert('sorry')" />

Which option is the most maintainable way to attach JavaScript functionality to an HTML element?

Which will return all HTTP headers?

Top most object in the object hierarchy?

Which is true about setTimeOut()?

What does the + sign in front of a function name mean in JavaScript?

What's the output? var somevar; alert(typeof(somevar));

Which statement is true?

Which property contains user agent string of web browser?

Which statement defines a regular expression?

Value of C in given code? function a(version) {   this.version = version; } a.prototype.version = '1.8'; var b = new a('1.8.1'); delete b.version; var c = b.version;