Communication of components

When I was writing the explanation of component nesting ：

App When the component headers Parent component of component ; 

One 、 In the development process , We often encounter communication between components ：

• such as App Many may be used Header, Everywhere Header The content displayed is different , Then we need User delivery Header Some of the data , Let it show ;
• Another example is that we are in Main Once in a while Request the Banner Data and ProductList data , Then you need to pass it on to them for display
• It could be An event occurred in the subcomponent , need Some operations are done by the parent component , It needs to The child component passes events to the parent component ;

Two 、 Communication between parent and child components

• Pass parent component to child component ： adopt props attribute ;
• The child component is passed to the parent component ： adopt $emit Triggering event ;