1var els = document.getElementsByClassName("myClass");
2for(var i = 0; i < els.length; i++)
3{
4  console.log(els[i]);
5}

1var person={
2 	first_name:"johnny",
3  	last_name: "johnson",
4	phone:"703-3424-1111"
5};
6for (var property in person) {
7  	console.log(property,":",person[property]);
8}

1var myElements = document.getElementsByClassName("some_class_name");
2for(var i = 0; i < myElements.length; i++){
3	console.log(myElements[i]);
4}