还可以使用JavaScript的短三元条件运算符吗?在Angular中是这样的:

{{doThis() ? 'foo' : 'bar'}}

or

<div [ngClass]="doThis() ? 'foo' : 'bar'">

对于Angular 9/8

源链接及示例

    export class AppComponent {
      isDone = true;
    }

1) * ngIf

    <div *ngIf="isDone">
      It's Done!
    </div>

    <!-- Negation operator-->
    <div *ngIf="!isDone">
      It's Not Done!
    </div>

2) *ngIf和Else

    <ng-container *ngIf="isDone; else elseNotDone">
      It's Done!
    </ng-container>

    <ng-template #elseNotDone>
      It's Not Done!
    </ng-template>

3) *ngIf, Then和Else

    <ng-container *ngIf="isDone;  then iAmDone; else iAmNotDone">
    </ng-container>

    <ng-template #iAmDone>
      It's Done!
    </ng-template>

    <ng-template #iAmNotDone>
      It's Not Done!
    </ng-template>

**ngIf else** <div *ngIf="isConditionTrue;else other_condition"> your content here </div> <ng-template #other_condition>other content here...</ng-template> **ngIf then else** <div *ngIf="isConditionTrue;then content else other_content">here is ignored</div> <ng-template #content>content here...</ng-template> <ng-template #other_content>other content here...</ng-template> **ngIf then** <div *ngIf="isConditionTrue;then content"></div> <ng-template #content>content here...</ng-template>

所以，这实际上并没有使用ng-if，但许多建议似乎是处理在条件语句中编写文本。我认为这种方法是用最少的代码或复杂性来做到这一点的最好方法。你来评判吧。

<div>{{variable == null ? 'Testing1' : 'Testing2'}}<div>
OR
<div>{{variable == null ? var1 : var2 }}<div>

还可以使用JavaScript的短三元条件运算符吗?在Angular中是这样的:

{{doThis() ? 'foo' : 'bar'}}

or

<div [ngClass]="doThis() ? 'foo' : 'bar'">

如果isShow为真，则第一行执行，否则执行第二行，因为elseBlockShow作为引用变量。

<div *ngIf="isShow; else elseBlockShow">
  Text to show for If
</div>
<ng-template #elseBlockShow>
  Text to show for else block
</ng-template>