for in

js/script.js

var ara0 = [1, 2, 3, 4, 5];
var ara1 = new Object();
ara1['one'] = 1;
ara1['two'] = 2;
ara1['three'] = 3;
ara1['four'] = 4;
ara1['five'] = 5;
function objOne() {
this.val0 = 'Hello World!',
this.val1 = 'Привет Мир!',
this.val2 = 'To be or not to be?'
}
function funMake() {
for(var i in ara0) {
document.write(i + ' ');
}
document.write('<br /><br />');
for(var i in ara1) {
document.write(i + ' = ' + ara1[i] + '<br />');
}
document.write('<br />');
var O = new objOne();
for(var i in O) {
document.write(i + ' = ' + O[i] + '<br />');
}
}

var ara0 = [1, 2, 3, 4, 5];
var ara1 = new Object();
ara1['one'] = 1;
ara1['two'] = 2;
ara1['three'] = 3;
ara1['four'] = 4;
ara1['five'] = 5;
function objOne() {
this.val0 = 'Hello World!',
this.val1 = 'Привет Мир!',
this.val2 = 'To be or not to be?'
}
function funMake() {
for(var i in ara0) {
document.write(i + ' ');
}
document.write('<br /><br />');
for(var i in ara1) {
document.write(i + ' = ' + ara1[i] + '<br />');
}
document.write('<br />');
var O = new objOne();
for(var i in O) {
document.write(i + ' = ' + O[i] + '<br />');
}
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<script src="js/script.js"></script>
</head>
<body>
<script>
funMake();
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<script src="js/script.js"></script>
</head>
<body>
<script>
funMake();
</script>
</body>
</html>