getting first class content

i have several class with a name, how can getting content first class.

like:
<div class="hi">
<div class="hey"><input name="hello1"></div> // this is 1
<div class="hey"><input name="hello2"></div> // this is 2
<div class="hey"><input name="hello3"></div> // this is 3
</div>

only getting: class number 1 // <开发者_如何学Go;input name="hello1">

how is it with jQuery?

JSFiddle Example

// Pure JavaScript
var els = document.getElementsByClassName('hey');
els[0].innerHTML;

// jQuery
$(".hey:eq(0)").html();
$(".hey").eq(0).html();
$(".hey:first").html();
$(".hey").first().html();
$(".hey:first-child").html();

Note: In jQuery, selecting by class is usually one of the slowest methods. It's faster to select by element.className (eg div.hey), but really, selecting by ID is the quickest (not "element#id", just "#id"). Hope this helps

If you want the html content of the first div with class 'hey', try this:

var firstChildContent = $('div.hey:first-child').html());

Try this

$('div.hey:eq(0)').html();

use the :first selector

$('.hey:first').html(); // this is shorter (but less performant)
$('.hey').filter(':first').html(); // this is more performant (based on jQuery documentation)

or use the .first() method

$('.hey').first().html();

or use .eq() to get a specific index

$('.hey').eq(0).html(); // first element in the group using a 0-based index

$('.hey:eq(0)').html()

to access hello 1

similarly

$('.hey:eq(1)').html()

to access hello 2

and

$('.hey:eq(2)').html()

to access hello 3

var hey = document.getElement('.hey');

This is quite old question, but for those who find it by Google as I did: you can use document.querySelector if you do not support IE8 and lower:

var el = document.querySelector('.hey');
el.innerHTML;

Or even better you can use it on parent element:

// let's say that hi element has id instead of class
var parent = document.getElementById('hi'); 
var el = parent.querySelector('.hey');
el.innerHTML;

This is better than using getElementsByClassName because the browser don't need to search for all the classes in the document. So it should be also faster.