npm installazione bootstrap
npm install bootstrap@latest
avvio npm
npm install bootstrap
//OR
npm install bootstrap@latest
< link rel=" foglio di stile"href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
./ node_modules / bootstrap / dist / js / bootstrap.bundle.js
npm i --save-dev bootstrap@next bootstrap-loader tether jquery