Pass child component to parent component

1. What kind of situation does the sub component Zu Yao deliver content to the sub component ？

• When Some events occur in the subcomponent When , For example, a click occurs in a component , Parent component needs to switch content ;
• Child components There is something you want to pass to the parent component When ;

How do we complete the above operation ？

1. First , We need to be in The name of the event to be triggered in some cases is defined in the sub component ;
2. secondly , stay In parent component v-on Pass in the event name to listen , And bound to the corresponding method
3. Last , When an event occurs in a subcomponent , Trigger the corresponding event according to the event name ;

Small cases ：

  When delivering events , You can also pass a parameter .

Receive and process this parameter ：