今天在开发时报了以下错误，记录一下
我们不能在组件销毁后设置state，防止出现内存泄漏的情况
出现原因直接告诉你了，组件都被销毁了，还设置个锤子的state啊
解决方案：
利用生命周期钩子函数：componentWillUnmount
将报错的地方移入此钩子里进行处理
componentWillUnmount(){
//处理逻辑
}
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