[ngClass] 与 [class] 绑定的区别 [英] Difference between [ngClass] vs [class] binding

问题描述

以下代码段在 Angular 2 中有什么区别:

<div [ngClass]="{'extra-sparkle': isDelightful}">

解决方案

这是特殊的 Angular 绑定语法

这是 Angular 编译器的一部分，您无法按照此绑定样式构建自定义绑定变体.唯一支持的是 [class.xxx]=..."、[style.xxx]=..." 和 [attr.xxx]=..."

ngClass 是一个普通的 Angular 指令，你可以自己构建它

<div [ngClass]={'extra-sparkle': isDelightful}">

ngClass 更强大.它允许您绑定类字符串、字符串数组或示例中的对象.

What is the difference in Angular 2 between the following snippets:

<div [class.extra-sparkle]="isDelightful">
<div [ngClass]="{'extra-sparkle': isDelightful}">

解决方案

This is special Angular binding syntax

<div [class.extra-sparkle]="isDelightful">

This is part of the Angular compiler and you can't build a custom binding variant following this binding style. The only supported are [class.xxx]="...", [style.xxx]="...", and [attr.xxx]="..."

ngClass is a normal Angular directive like you can build it yourself

<div [ngClass]="{'extra-sparkle': isDelightful}">

ngClass is more powerful. It allows you to bind a string of classes, an array of strings, or an object like in your example.

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