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Số câu đúng var x; var numQues = 3; var seconds = 45*60; var countdownTimer = setInterval(‘secondPassed()’, 1000); var numChoi = 4; var answers = new Array(3); answers[0] = “C”; answers[1] = “C”; answers[2] = “A”; for (i=1; i<=numQues; i++) { x = document.getElementById("lgc"+i); x.style.display = "none"; } function XemLoiGiai() { for (i=1; i<=numQues; i++) { x = document.getElementById("lgc"+i); if (x.style.display === "block") { x.style.display = "none"; } else { x.style.display = "block"; } } } function secondPassed() { var minutes = Math.round((seconds – 30)/60); var remainingSeconds = seconds % 60; if (remainingSeconds < 10) { remainingSeconds = "0" + remainingSeconds; } document.getElementById('thoigian').innerHTML = minutes + ":" + remainingSeconds; if (seconds == 0) { clearInterval(countdownTimer); document.getElementById('thoigian').innerHTML = "Hết giờ!"; buttonT1_onclick(); } else { seconds–; } } function XemDA(form) { var correctAnswers = ""; for (i=1; i<=numQues; i++) { correctAnswers += i + "." + answers[i-1] + " "; } form.solutions.value = correctAnswers; } function ChamDiem(form) { var score = 0; var currElt; var currSelection; for (i=0; i<numQues; i++) { currElt = i*numChoi; for (j=0; j<numChoi; j++) { currSelection = form.elements[currElt + j]; if (currSelection.checked) { if (currSelection.value == answers[i]) { score++; break; } } } } form.percentage.value = score + "/" + numQues } Xem lời giải