要打印JavaScript对象的内容，请尝试运行以下代码。该代码将打印对象及其属性和值-
<!DOCTYPE html>
<html>
<body>
<script>
function display(obj) {
var res = '';
for (var a in obj) {
res += a + ': ' + obj[a] + '\n';
}
alert(res);
}
var newObject = {'Amit': 70778, 'Sachin': 87547, 'Saurav': 57535};
display(newObject);
</script>
</body>
</html>