Angular 2 : What is diagnostic property in forms

Question

我不明白 angular2 网站上的这一段:

We threw in a diagnostic property at the end to return a JSON representation of our model. It'll help us see what we're doing during our development; we've left ourselves a cleanup note to discard it later.

Here is the link

什么意思

Answer 1

他们只是添加了一个 getter diagnostic 来获取模型作为字符串。然后他们将 {{diagnostic}} 添加到模板以使原始模型在测试表单时可见，以便在他们编辑表单时始终查看模型是否更新。

`{{model | json}}`

也会这样做。