http://sinhviencntt.net/hoc-javascript-bai-14-cac-vong-lap-for-trong-javascript/

http://sinhviencntt.net/hoc-javascript-bai-14-cac-vong-lap-for-trong-javascript/

by sinhviencntt

HTML

<!DOCTYPE html>
<html>
<body>
 
<h1>Vòng lặp for...in sinhviencntt.net</h1>
 
<p id="demo"></p>
 
<script>
var txt = "";
var lapTrinh = ["PHP", "Java", "C#"];
for (var x in lapTrinh) {
    txt += x + ": " + lapTrinh[x] + "</br>";
}
document.getElementById("demo").innerHTML = txt;
</script>
 
</body>
</html>