.map files allow a browser to download a full version of the minified JS. ... Delete the line "/*# sourceMappingURL=bootstrap.min.css.map ... ... <看更多>

Looks like the minified CSS from the boostrap upgrade has references ... 404 errors (possibly because the sourcemap is bootstrap.min.css.map ... ... <看更多>

as well as compiled and minified CSS and JS ( bootstrap.min.* ). CSS source maps ( bootstrap.*.map ) are available for use with certain browsers' developer ... ... <看更多>