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IterableDiffer

用来跟踪一个迭代内的更改的策略。NgForOf使用它通过对 DOM 进行等效更改来响应此迭代内的更改。

A strategy for tracking changes over time to an iterable. Used by NgForOfto respond to changes in an iterable by effecting equivalent changes in the DOM.

      
      interface IterableDiffer<V> {
  diff(object: NgIterable<V>): IterableChanges<V> | null
}

实现类

方法

diff()

计算先前状态和新 object 状态之间的差异。

Compute a difference between the previous state and the new object state.

      
      diff(object: NgIterable<V>): IterableChanges<V> | null
参数
object NgIterable

包含新值。

containing the new value.

返回值

描述差异的对象。返回值仅在下一次 diff() 调用之前有效。

IterableChanges<V> | null: an object describing the difference. The return value is only valid until the next diff() invocation.