您可以通过将formcontrol值附加到mat-input的[disabled]指令来实现这一点。
1)仅读取toppings（表单控件）值

isValueSelected(): boolean {
    var valueArray: any = this.toppings.value || [];
    console.log(valueArray, valueArray.includes('Mushroom'));
    return !valueArray.includes('Mushroom');
 }

2)attach it to [disabled]指令

<input id="numeDB_SQLite" type="text" name="numeDB_SQLite" [disabled]="isValueSelected()"/>

我已经更新了你的stackblitz here.请upvote/选择如果帮助.

如果选择了某个值，则禁用

<input id="numeDB_SQLite" type="text" matInput 
      [disabled]="toppings?.value && toppings.value.length" ../>

如果在选择一个元素时要禁用，例如

<input id="numeDB_SQLite" type="text" matInput 
          [disabled]="toppings?.value && toppings.value.includes('Mushroom')" ../>