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AppStorage.setOrCreate<string>('testMsg', 'hello harmony');

@StorageLink('testMsg') testMsg: string = ''  
build() {  
Button('change').onClick(() => this.testMsg = 'new msg')  
}

@StorageProp('testMsg') testMsg: string = '' // 根据需要使用StorageProp或者StorageLink  
struct comA{  
build() {  
Text(this.testMsg)  
}  
}