Что не так со скриптом?

<script type="text/javascript"> 
document.getElementById('block').innerHTML = 'text';
</script>
<div id="block"></div>

<script type="text/javascript"> 
    $('#block').text('text');
</script>

<script type="text/javascript">
function changeText(){
	document.getElementById('block').innerHTML = 'text';
}
</script>

document.addEventListener("DOMContentLoaded", function(event) { 
  document.getElementById('block').innerHTML = 'text';
});

document.addEventListener("DOMContentLoaded", function(event) { 
    document.getElementById('block').innerHTML = 'text';
});

<div id="block"></div>

$(document).ready{
    $('#block').text('text');
});

<div id="block"></div>

$(function(){
    $('#block').text('text');
});