[Vue warn]: Property or method "nubmer" is not defined on the instance but referenced during render.

vue.js:634 [Vue warn]: Property or method “nubmer” is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See

在vue-demo编写时报如下错误，首先查看字面意思，需要number方法没有定义，查看代码：

仔细查看，发现自己在编写number变量时，大括号书写错误，使用的是中文大括号。