1. First, according to the official website sass, https: //www.sass.hk/install/, instructiongem install sass，一直安装不成功。
2. Because this is the create-react-app, the install so npm sass-loader node-sass , in which node-sass not installed successfully
On the rule where you can
Find the config inside the two configuration files.
Contents of the configuration are the same.
Code: {
Test: /\.scss$/,
loaders to: [ 'style-Loader', 'CSS-Loader', 'Sass-Loader'],
},
This configuration a bit, then write directly to a index.scss file, use the syntax scss on it, it can be used.
3.scss syntax, there have {};
$color:red;
.a{
color:$color;
}
sass old grammar, syntax is not {} not; because they do not meet everyone's programming practice, so eliminated, grammar scss now used up
$color:red;
.a
color:$color