<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
array1 = [5, 1, 3];
array2 = {1: 15, 2: 20, 3: 10, 4: 5, 5: 50};
var result = {};
for (var i in array2) {
if (array1.indexOf(+i) < 0) {
result[i] = array2[i];
}
}
document.writeln(JSON.stringify(result));
</script>
</head>
<body>
</body>
</html>