CommonModule

ngmodule

导出所有基本的 Angular 指令和管道，例如 NgIf、NgForOf、DecimalPipe 等。它会由 BrowserModule 进行二次导出，当你使用 CLI 的 new 命令创建新应用时，BrowserModule 会自动包含在根模块 AppModule 中。

Exports all the basic Angular directives and pipes, such as NgIf, NgForOf, DecimalPipe, and so on. Re-exported by BrowserModule, which is included automatically in the root AppModule when you create a new app with the CLI new command.

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      class CommonModule {
}

说明

providers 选项配置了 NgModule 的注入器，来为其成员提供本地化依赖。
The providers options configure the NgModule's injector to provide localization dependencies to members.
exports 选项让这里声明的指令和管道可以被导入到其它 NgModule 中。
The exports options make the declared directives and pipes available for import by other NgModules.

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{ provide: NgLocalization, useClass: NgLocaleLocalization } `{ provide: NgLocalization, useClass: NgLocaleLocalization }`

指令

名称	说明
NgClass `NgClass`	从 HTML 元素上添加和移除 CSS 类。 Adds and removes CSS classes on an HTML element.
NgComponentOutlet `NgComponentOutlet`	Instantiates a single `Component`type and inserts its Host View into current View. `NgComponentOutlet` provides a declarative approach for dynamic component creation.
NgForOf `NgForOf`	`NgForOf` 指令会为可迭代对象中的每一个条目实例化一个模板。实例化时的上下文环境来自其外部环境，它以当前正在迭代的条目作为循环变量。 The `NgForOf` directive instantiates a template once per item from an iterable. The context for each instantiated template inherits from the outer context with the given loop variable set to the current item from the iterable.
NgIf `NgIf`	根据 `expression` 表达式的值，有条件的包含某个模板。 Conditionally includes a template based on the value of an `expression`.
NgPlural `NgPlural`	Adds / removes DOM sub-trees based on a numeric value. Tailored for pluralization.
NgPluralCase `NgPluralCase`	Creates a view that will be added/removed from the parent `NgPlural`when the given expression matches the plural expression according to CLDR rules.
NgStyle `NgStyle`	修改 HTML 元素的样式。 Update an HTML element styles.
NgSwitch `NgSwitch`	根据内嵌的匹配表达式和 switch 表达式的匹配结果，添加或删除子树。 Adds / removes DOM sub-trees when the nest match expressions matches the switch expression.
NgSwitchCase `NgSwitchCase`	如果指定的表达式的计算结果和 `switch` 表达式相同，就会在父指令 `NgSwitch`中创建一个视图；如果不同，则移除。 Creates a view that will be added/removed from the parent `NgSwitch`when the given expression evaluate to respectively the same/different value as the switch expression.
NgSwitchDefault `NgSwitchDefault`	当没有任何 `case` 表达式匹配 `switch` 表达式的结果时，就会在父指令 `NgSwitch`中创建一个视图。 Creates a view that is added to the parent `NgSwitch`when no case expressions match the switch expression.
NgTemplateOutlet `NgTemplateOutlet`	根据一个提前备好的 `TemplateRef` 插入一个内嵌视图。 Inserts an embedded view from a prepared `TemplateRef`.

管道

名称	说明
AsyncPipe `AsyncPipe`	从一个异步回执中解出一个值。 Unwraps a value from an asynchronous primitive.
CurrencyPipe `CurrencyPipe`	把数字转换成金额字符串，根据本地化规则进行格式化，这些规则会决定分组大小和分组分隔符、小数点字符以及其它与本地化环境有关的配置项。 Transforms a number to a currency string, formatted according to locale rules that determine group sizing and separator, decimal-point character, and other locale-specific configurations.
DatePipe `DatePipe`	根据区域设置规则格式化日期值。 Formats a date value according to locale rules.
DecimalPipe `DecimalPipe`	把数字转换成字符串，根据本地化规则进行格式化，这些规则会决定分组大小和分组分隔符、小数点字符以及其它与本地化环境有关的配置项。 Transforms a number into a string, formatted according to locale rules that determine group sizing and separator, decimal-point character, and other locale-specific configurations.
DeprecatedCurrencyPipe `DeprecatedCurrencyPipe`	Formats a number as currency using locale rules.
DeprecatedDatePipe `DeprecatedDatePipe`	Formats a date according to locale rules.
DeprecatedDecimalPipe `DeprecatedDecimalPipe`	Formats a number as text. Group sizing and separator and other locale-specific configurations are based on the active locale.
DeprecatedPercentPipe `DeprecatedPercentPipe`	Formats a number as percentage according to locale rules.
I18nPluralPipe `I18nPluralPipe`	Maps a value to a string that pluralizes the value according to locale rules.
I18nSelectPipe `I18nSelectPipe`	Generic selector that displays the string that matches the current value.
JsonPipe `JsonPipe`	把一个值转换成 JSON 字符串格式。在调试时很有用。 Converts a value into its JSON-format representation. Useful for debugging.
KeyValuePipe `KeyValuePipe`	Transforms Object or Map into an array of key value pairs.
LowerCasePipe `LowerCasePipe`	把文本转换成全小写形式。 Transforms text to all lower case.
PercentPipe `PercentPipe`	把数字转换成百分比字符串，根据本地化规则进行格式化，这些规则会决定分组大小和分组分隔符、小数点字符以及其它与本地化环境有关的配置项。 Transforms a number to a percentage string, formatted according to locale rules that determine group sizing and separator, decimal-point character, and other locale-specific configurations.
SlicePipe `SlicePipe`	从一个 `Array` 或 `String` 中创建其元素一个新子集（slice）。 Creates a new `Array` or `String` containing a subset (slice) of the elements.
TitleCasePipe `TitleCasePipe`	把文本转换成标题形式。把每个单词的第一个字母转成大写形式，并把单词的其余部分转成小写形式。单词之间用任意空白字符进行分隔，比如空格、Tab 或换行符。 Transforms text to title case. Capitalizes the first letter of each word, and transforms the rest of the word to lower case. Words are delimited by any whitespace character, such as a space, tab, or line-feed character.
UpperCasePipe `UpperCasePipe`	把文本转换成全大写形式。 Transforms text to all upper case.

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