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错误信息如下:
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. in CommentList (created by Route) 原因:关于react中切换路由时报以上错误,实际的原因是因为在组件挂载(mounted)之后进行了异步操作,比如ajax请求或者设置了定时器等,而你在callback中进行了setState操作。当你切换路由时,组件已经被卸载(unmounted)了,此时异步操作中callback还在执行,因此setState没有得到值。 解决方案: 一、在卸载的时候对所有的操作进行清除(例如:abort你的ajax请求或者清除定时器) componentDidMount = () => {
//1.ajax请求
$.ajax('你的请求',{})
.then(res => {
this.setState({
aa:true
})
})
.catch(err => {})
//2.定时器
timer = setTimeout(() => {
//dosomething
},1000)
}
componentWillUnMount = () => {
//1.ajax请求
$.ajax.abort()
//2.定时器
clearTimeout(timer)
}二、设置一个flag,当unmount的时候重置这个flag
componentDidMount = () => {
this._isMounted = true;
$.ajax('你的请求',{})
.then(res => {
if(this._isMounted){
this.setState({
aa:true
})
}
})
.catch(err => {})
}
componentWillUnMount = () => {
this._isMounted = false;
}三、最简单的方式(万金油)componentDidMount = () => {
$.ajax('你的请求',{})
.then(res => {
this.setState({
data: datas,
});
})
.catch(error => {
});
}
componentWillUnmount = () => {
this.setState = (state,callback)=>{
return;
};
}参考:https://www.cnblogs.com/zyl-Tara/p/7998590.html |
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