Pipe

decorator

Decorator that marks a class as pipe and supplies configuration metadata.

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选项说明

选项	说明
`name`	在模板中绑定时使用的管道名。通常使用 lowerCamelCase 拼写方式，因为名字中不允许包含减号（-）。 The pipe name to use in template bindings. Typically uses lowerCamelCase because the name cannot contain hyphens.
`pure`	为 `true` 时，该管道是纯管道，也就是说 `transform()` 方法只有在其输入参数变化时才会被调用。管道默认都是纯管道。 When true, the pipe is pure, meaning that the `transform()` method is invoked only when its input arguments change. Pipes are pure by default.

name

在模板中绑定时使用的管道名。通常使用 lowerCamelCase 拼写方式，因为名字中不允许包含减号（-）。

The pipe name to use in template bindings. Typically uses lowerCamelCase because the name cannot contain hyphens.

pure

为 true 时，该管道是纯管道，也就是说 transform() 方法只有在其输入参数变化时才会被调用。管道默认都是纯管道。

When true, the pipe is pure, meaning that the transform() method is invoked only when its input arguments change. Pipes are pure by default.

参见

Style Guide: Pipe Names

说明

A pipe class must implement the PipeTransform interface. For example, if the name is "myPipe", use a template binding expression such as the following:

      
      {{ exp | myPipe }}

The result of the expression is passed to the pipe's transform() method.

A pipe must belong to an NgModule in order for it to be available to a template. To make it a member of an NgModule, list it in the declarations field of the NgModule metadata.

选项

name
在模板中绑定时使用的管道名。通常使用 lowerCamelCase 拼写方式，因为名字中不允许包含减号（-）。 The pipe name to use in template bindings. Typically uses lowerCamelCase because the name cannot contain hyphens.
name: string `name: string`

name

在模板中绑定时使用的管道名。通常使用 lowerCamelCase 拼写方式，因为名字中不允许包含减号（-）。

The pipe name to use in template bindings. Typically uses lowerCamelCase because the name cannot contain hyphens.

      
      name: string

pure
为 `true` 时，该管道是纯管道，也就是说 `transform()` 方法只有在其输入参数变化时才会被调用。管道默认都是纯管道。 When true, the pipe is pure, meaning that the `transform()` method is invoked only when its input arguments change. Pipes are pure by default.
pure: boolean `pure: boolean`
如果该管道具有内部状态（也就是说，其结果会依赖内部状态，而不仅仅依赖参数），就要把 `pure` 设置为 `false`。这种情况下，该管道会在每个变更检测周期中都被调用一次 —— 即使其参数没有发生任何变化。 If the pipe has internal state (that is, the result depends on state other than its arguments), set `pure` to false. In this case, the pipe is invoked on each change-detection cycle, even if the arguments have not changed.

pure

为 true 时，该管道是纯管道，也就是说 transform() 方法只有在其输入参数变化时才会被调用。管道默认都是纯管道。

When true, the pipe is pure, meaning that the transform() method is invoked only when its input arguments change. Pipes are pure by default.

      
      pure: boolean

如果该管道具有内部状态（也就是说，其结果会依赖内部状态，而不仅仅依赖参数），就要把 pure 设置为 false。这种情况下，该管道会在每个变更检测周期中都被调用一次 —— 即使其参数没有发生任何变化。

If the pipe has internal state (that is, the result depends on state other than its arguments), set pure to false. In this case, the pipe is invoked on each change-detection cycle, even if the arguments have not changed.

参见link

说明link

选项link

namelink

purelink

参见

说明

选项

name

pure