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组件内部watch后切换数据报错Error in callback for watcher “xxxx“

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组件内部watch后切换数据报错Error in callback for watcher “xxxx“

报错信息：
组件内部watch后切换数据报错Error in callback for watcher “xxxx“

报错代码：组件内部watch后切换数据报错Error in callback for watcher “xxxx“
百度了一下是因为这里写了箭头函数，导致this指向为父级作用域上下文，不是vue实例导致

修改为：

progressData: {handler: function(newValue, oldValue) {this.setChartData(newValue)},deep: true,},