loadjscssfile(
    '//cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/vs.min.css',
    'css')
loadjscssfile(
    '//cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/highlight.min.js', 'js')
setTimeout(
    "var a = document.querySelectorAll('.code'); for(var i=0; i < a.length; ++i) hljs.highlightBlock(a[i])"
    , 600)
Syntax highlighting in <pre> tags