答案 0 :(得分:0)
您的styles.css中材质主题的导入路径已更改。它现在是:@import '~@angular/material/prebuilt-themes/deeppurple-amber.css';
有关更多信息,请参阅: https://material.angular.io/guide/theming
更改日志(2.0.0-beta.3 cesium-cephalopod): https://github.com/angular/material2/blob/master/CHANGELOG.md