Error in v-on handler: 「TypeError: _vm.addCart is not a function「

代碼很簡單，就是寫了一個函數， 點擊按鈕後調用不了並且報錯 具體報錯如下： [Vue warn]: Property or method "addCart" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data

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