Vue-router踩坑之旅（1）

报错：

 ERROR  Failed to compile with 1 errors                                                                                            09:38:01
This dependency was not found:


* !!vue-style-loader!css-loader?{"sourceMap":true}!../../node_modules/vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-573557d0","scoped":true,"hasInlineConfig":false}!stylus-loader?{"sourceMap":true}!../../node_modules/vue-loader/lib/selector?type=styles&index=0!./head.vue in ./src/components/head.vue

To install it, you can run: npm install --save !!vue-style-loader!css-loader?{"sourceMap":true}!../../node_modules/vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-573557d0","scoped":true,"hasInlineConfig":false}!stylus-loader?{"sourceMap":true}!../../node_modules/vue-loader/lib/selector?type=styles&index=0!./head.vue

原因：

解决：

npm install stylus stylus-loader style-loader --save-dev