Use jQuery in the browser console

Use jquery in the browser console

var jquery = document.createElement('script');  
jquery.src = 'https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js';
document.getElementsByTagName('head')[0].appendChild(jquery);  
jQuery.noConflict(); //解决库冲突

Verify that it is normal

$.fn.jquery

If normal, output the version number

"3.4.1"