include jQuery in Chrome Console

gistfile1.js

var script = document.createElement("script");
  script.setAttribute("src", "http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js");
  script.addEventListener('load', function() {
    var script = document.createElement("script");
    document.body.appendChild(script);
  }, false);
  document.body.appendChild(script);

Always use the latest:

var script = document.createElement("script");
  script.setAttribute("src", "//code.jquery.com/jquery-latest.min.js");
  script.addEventListener('load', function() {
    var script = document.createElement("script");
    document.body.appendChild(script);
  }, false);
  document.body.appendChild(script);

Always use let ;)

let script = document.createElement("script");
script.setAttribute('src', '//code.jquery.com/jquery-latest.min.js');
script.addEventListener('load', function() {
	let script = document.createElement('script');
	document.body.appendChild(script);
}, false);
document.body.appendChild(script);

I couldn't get this to work with what I was doing. This one worked for me and it uses promises:

fetch('https://code.jquery.com/jquery-latest.min.js')
  .then(r => r.text())
  .then(r => { Function(`'use strict'; ${r}`)() });