ngSwitch和NGPluble-Angular的区别是什么

我浏览了Angular文档，找不到它们之间的区别 在本例中，我也在它们之间进行了切换：

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并且得到了相同的结果

ngSwitch根据布尔表达式值有条件地添加/删除DOM元素

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ngPlural有条件地添加/删除DOM子树取决于数值

ngSwitch有条件地添加/删除DOM元素取决于任何值字符串、数字、布尔值 ngSwitch：有吗

ngPlural有条件地添加/删除DOM子树仅取决于数值 复数：数字

Html文件

<p>
 I have {{count1}} items, but I could also say 

 <span [ngSwitch]="count1">
 <ng-template ngSwitchCase="zero">there are no items.</ng-template>
 <ng-template ngSwitchCase="one">there is one item.</ng-template>
 <ng-template ngSwitchCase="2">there are four items.</ng-template>
 <ng-template ngSwitchCase="many">there are many items.</ng-template>
 <ng-template ngSwitchCase="other">there are some items.</ng-template>
 </span>
</p>

<p>
 I have {{count}} items, but I could also say 

 <span [ngPlural]="count">
 <ng-template ngPluralCase="zero">there are no items.</ng-template>
 <ng-template ngPluralCase="one">there is one item.</ng-template>
 <ng-template ngPluralCase="2">there are four items.</ng-template>
 <ng-template ngPluralCase="many">there are many items.</ng-template>
 <ng-template ngPluralCase="other">there are some items.</ng-template>
 </span>
</p>

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[ngPluralCase]创建一个视图，根据CLDR规则，当给定表达式与复数表达式匹配时，该视图将从父ngPluralCase中添加/删除

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参考本网站

布尔值表示表达式，表达式总是返回true或false，这是开关大小写语句。那么为什么要使用NGPLUMAL？那么difference@OmarHasan请仔细阅读CLDR规则，然后您就会明白。根据我的理解，“复数”在多语言项目中很有用。

export class AppComponent {
  count = "zero" // ngPlural when I give string values it goes to default statement
  count1 = "one" // ngSwitch works here perfectly
}