$(document).ready(function() {}) does not execute the initialization script_jquery

Today I found a page that never executes the initialization script. The code is as follows:

<script type="text/javascript" src="Script/jquery-1.11.1.min.js" />
<script type="text/javascript">
$(document).ready(function() {
alert(1);
});
</script>

Later I found out that the problem was just due to the closing method when referencing JQuery. I only needed to modify the closing method, as shown below:

<script type="text/javascript" src="Script/jquery-1.11.1.min.js" />

changed to

<script type="text/javascript" src="Script/jquery-1.11.1.min.js"></script>

Unknown reason...