你应该用
ViewEncapsulation
只需添加到您的组件
encapsulation: ViewEncapsulation.None：
import { Component, ViewEncapsulation } from "@angular/core";@Component({ selector: '....', templateUrl: '....', styles: [` .ag-theme-fresh .ag-row-selected { background-color: #1428df !important; } `], encapsulation: ViewEncapsulation.None})
