如何在 Angular 7 中设置选择选项的值？

Answer 1

您可以使用

[selected]="condition that will result true for the option you want default"

例如，如果您想要第一个索引（基于您在组件中的代码），您会喜欢：

<option *ngFor="let operator of operators; let i = index;" [selected] = "i==1">{{operator.desc}}</option>

Another example is, if you want lets say operator desc 'xyz' selected, you'd like:

 <option *ngFor="let operator of operators; let i = index;" [selected] = "operator.desc == xyz">{{operator.desc}}</option>