Which of the following statements is true?

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

.... property refers to the window that opens another window.

Which method can you use to convert JSON data in responseText to JavaScript object?

Create the XMLHttpRequest is the same in all Internet Explorer browser versions.

Which ways can you use to attach click event handler to id1 div tag on all browsers?

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

What's the output? document.getElementById('banana').className = document.getElementById('banana').className.replace( /(?:^|\s)apple(?!\S)/g ,'e' );

Which will correctly get the length of an object?

Which one shows an alert for an empty string? var a = '''';