问如何在Laravel中将Bootstrap 4降级为3

EN

1. Npm install bootstrap@3.3.7
2. Change the bootstrap entry from package.json and replace it with "bootstrap": "3.3.7"
3. in resources/assets/sass/app.scss,
        a. comment out the import of variables 
           OR change height base to 14 px instead of 0.9 rem in _variable.scss. 
        b. change the path of bootstrap to 
           @import "node_modules/bootstrap-sass/assets/stylesheets/bootstrap";
4. in resources/assets/js/bootstrap.js, 
   look for require('bootsrap-sass'); and change it to require('bootstrap');