1.@Prop：父組件傳遞給子組件，單向傳遞，子組件改變值，父組件UI不更新。

? 引入子組件 ?并賦值，子組件用@Prop 接收

? import headerView from '../../common/bean/BaseNavHeaderView' ??

headerView({titlestr:'添加地址',isback:true,isleftimage:'',isright:true,rightcontentstr:'保存',rightimage:'',fromehere:'添加地址',startCalcute:this.startCalcuteMoney.bind(this)
}).width('100%').height('44').backgroundColor('#FFD615').zIndex(888)

@Component
export default  struct BaseNavHeaderView {@Prop titlestr:string;isback:Boolean;isleftimage:string;isright:Boolean;rightcontentstr:string;rightimage:string;fromehere:string;startCalcute:() => void = () =>{}

2.@Link 雙向傳遞，子組件改變父組件UI更新，注意：不能修飾帶@Entry 類型的pages.

? ?父試圖定義變量，傳遞給子組件child時要用$

@State dianjicounts:number = 0

?child({dianjicounts:$dianjicounts})

子組件接收

?@Component export default struct child {

? ? ? @Link dianjicounts:number

? ? 調用用this.dianjicounts

}

3.@Provide/@Consume 不需要傳遞參數，UI會更新

?父組件定義并調用子組件

@Provide dianjicounts: number = 0?

child()

子組件接收

@Component export default struct child {

? ? ?@Consume dianjicounts:number

? ? ?調用用this.dianjicounts

}

4.方法傳遞

? 父組件定義方法

startCalcuteMoney():void{

? ? ?console.log('保存一下')

}

傳給子組件，要用bind方法綁定一下

headerView({

? ?startCalcute:this.startCalcuteMoney.bind(this)

})?

子組件接收

@Component export default struct BaseNavHeaderView {

? ? ? ? @Prop startCalcute:() => void = () =>{}

子組件調用

? ? this.startCalcute()

}