append jquery cdn

append_js.js

var jq = document.createElement('script');
jq.src = "//ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);

/* test */
/*
for (var i = 1; i < 18; i++) {
    var btn = $( "input:radio[name='a" + i + "']" )
    btn[0].checked=true;
}
*/