Custom JQuery script in page template won’t work [duplicate]

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The version of jQuery distributed with WP runs in noConflict() mode (meaning that $ is not bound to the jQuery object).

Thus, you should do:

<script type="text/javascript">
    jQuery( document ).ready(function() {
        console.log( "ready!" );
    });
</script>

or

<script type="text/javascript">
(function ($) {
    $( document ).ready(function() {
        console.log( "ready!" );
    });
})(jQuery) ;
</script>