react报错:Can’t perform a React state update on an unmounted component

componentDidMount = () => {
$.ajax(‘你的请求’,{})
.then(res => {
this.setState({
data: datas,
});
})
.catch(error => {

 });

}
componentWillUnmount = () => {
this.setState = (state,callback)=>{
return;
};
}

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