How many times will the following loop print the word loop to the screen? var in

Question

How many times will the following loop print the word loop to the screen? var index = 0; while (index < 3) { window.document.writeln("loop"); index++; }
A) 1
B) 2
C) 3
D) 4

Keeping browser incompatibilities aside, an event can be registered except:
A) (input type="button" id="btn" name="btn" value="Click" /)
B) document.getElementById("btn").onclick = function() { alert("handler!"); }
C) document.getElementById("btn").addEventListener("onclick", handler, false);
D) document.getElementById("btn").addEventListener("click", handler, false);

Explanation / Answer

How many times will the following loop print the word loop to the screen? C) 3 Keeping browser incompatibilities aside, an event can be registered except: B) document.getElementById("btn").onclick = function() { alert("handler!"); }

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