Warning: Encountered two children with the same key
Warning: Encountered two children with the same key, `.$/base`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
children with the same key,
.$/base有两个组件的key重复了
组件的key应该唯一的,方便组件在更新的时候找到对应的组件.
解决方案：
在当前页面查找key 保证key的唯一性 Can’t call setState (or forceUpdate) on an unmounted component
Warning: Can't call setState (or forceUpdate) on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.
不能在已经被销毁的组件中调用setState()方案
出现场景：跳转路由 当前组件被销毁 组件内部还存在异步操作对state的状态信息 比如http请求,定时器setTimeOut更新state
思路就是在组件卸载之前 控制异步不进行setState
解决方案一：组件被销毁之前重写setState方法 不对状态做任何改变
componentWillUnmount(){
this.setState = (state,callback)=>{
return;
};
}
解决方案二：组件被销毁之前 可以setState 销毁之后就不能setState
componentWillMount() {
this._isMounted = true
fetch('网络请求').then (status, response)=>{
if (this._isMounted) {
this.setState({
activityTipsImg: response.data.tips_url,
activityTipsContent: response.data.tips_content
})
}
});
}
componentWillUnmount() {
this._isMounted = false
}