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chenc 2020-06-29 12:57:04 +08:00 committed by 雪狼
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aio/content/guide/pipes.md
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@ -413,7 +413,7 @@ So Angular uses a faster change-detection algorithm for executing a pipe, as des
By default, pipes are defined as *pure* so that Angular executes the pipe only when it detects a *pure change* to the input value. By default, pipes are defined as *pure* so that Angular executes the pipe only when it detects a *pure change* to the input value.
A pure change is either a change to a primitive input value (such as `String`, `Number`, `Boolean`, or `Symbol`), or a changed object reference (such as `Date`, `Array`, `Function`, or `Object`). A pure change is either a change to a primitive input value (such as `String`, `Number`, `Boolean`, or `Symbol`), or a changed object reference (such as `Date`, `Array`, `Function`, or `Object`).
通过默认情况下，管道会定义成*纯的(pure)*，这样 Angular 只有在检测到输入值发生了*纯变更*时才会执行该管道。春变更是对原始输入值（比如 `String`、`Number`、`Boolean` 或 `Symbol` ）的变更，或是对对象引用的变更（比如 `Date`、`Array`、`Function`、`Object`）。 通过默认情况下，管道会定义成*纯的(pure)*，这样 Angular 只有在检测到输入值发生了*纯变更*时才会执行该管道。纯变更是对原始输入值（比如 `String`、`Number`、`Boolean` 或 `Symbol` ）的变更，或是对对象引用的变更（比如 `Date`、`Array`、`Function`、`Object`）。
{@a pure-pipe-pure-fn} {@a pure-pipe-pure-fn}