angular-cn/aio/content/cheatsheet/built-in-directives.md

@cheatsheetSection Built-in directives @cheatsheetIndex 3 @description {@target ts}import { CommonModule } from '@angular/common';{@endtarget} {@target js}Available using the ng.common.CommonModule module{@endtarget}

@cheatsheetItem syntax: <section *ngIf="showSection">|*ngIf description: Removes or recreates a portion of the DOM tree based on the showSection expression.

@cheatsheetItem syntax: <li *ngFor="let item of list">|*ngFor description: Turns the li element and its contents into a template, and uses that to instantiate a view for each item in list.

@cheatsheetItem syntax: `<div [ngSwitch]="conditionExpression"> <ng-template [ngSwitchCase]="case1Exp">... ... ...

`|`[ngSwitch]`|`[ngSwitchCase]`|`ngSwitchCase`|`ngSwitchDefault` description: Conditionally swaps the contents of the div by selecting one of the embedded templates based on the current value of `conditionExpression`.

@cheatsheetItem syntax: <div [ngClass]="{active: isActive, disabled: isDisabled}">|[ngClass] description: Binds the presence of CSS classes on the element to the truthiness of the associated map values. The right-hand expression should return {class-name: true/false} map.