原因：没有导入主题
material
https://material.angular.io//theming
- Available pre-built themes:
deeppurple-amber.css
indigo-pink.css
pink-bluegrey.css
purple-green.css
解决方法：
- If you're using Angular CLI, this is as simple as including one line in your styles.css file:
@import '@angular/material/prebuilt-themes/deeppurple-amber.css';
- Alternatively, you can just reference the file directly in index.html. This would look something like:
<link href="node_modules/@angular/material/prebuilt-themes/indigo-pink.css" rel="stylesheet">
materialize
导入 node_modules/ materialize.css
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