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jQuery Selector - 如何select by id vs select by类名

class 【class】
我们想知道如何select by id vs select by类名。
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
  src='http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js'></script>
<script type='text/javascript'>
$(window).load(function(){
    $('#test').text('newtext');
    $('.test').text('newtest');
});
</script>
</head>
<body>
  <div id="test">test</div>
  <div id="test">test</div>
  <div class="test">test</div>
  <div class="test">test</div>
</body>
</html>