directive: 目的是給DOM元素添加自定義行為，可以和Component class一樣，實現(xiàn)life cycle hooks：

css selector：

在template中唯一標(biāo)識一個Directive，并且觸發(fā)Directive實例的初始化。

看一個錯誤：

Can’t bind to ‘cxFocusConfig’ since it isn’t a known property of ‘div’. ("

答案：

you cant use input/output outside component / directive tag

正確做法？

<div cxFocusDirective [cxFocusConfig]="Jerry">Hello</div>

in notification-message.component.html, it’s directly used in div tag
when I ctrl + click on line 3 above, it goes to line 12 in focus.directive.ts.

so it seems the name of selector and input are kept the same ON PURPOSE?

I think for small directives (single responsibility and single input) its simplified usage

更多Jerry的原創(chuàng)文章，盡在：“汪子熙”:

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