react常见组件问题Can't perform a React state update on an unmounted component

2019/12/27 11:35
阅读数 7.2K

在些react组件的时候,会有这个警告

Can't perform a React state update 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”

  这是因为在写一个方法完成请求后我们改变state状态,

  payload:values,
        callback:res=>{
          if(res.code === 0){
            notification.success({
              message: '密码更新成功',
              description: `新密码为 ${res.data}`,
              duration: 0,
            });
            successed&& successed();
              that.setState({
                updatePwdModalVisible:false
              })
            that.getCaptcha();

解决方法:利用生命周期钩子函数:componentWillUnmount,在组件卸载前清除timer

that.pwdErrorTimer = setTimeout(() => {
              this.setState({
                updatePwdModalVisible:false
              })
            }, 1000);

  

componentWillUnmount(){
    clearTimeout(this.pwdErrorTimer);
  }

  

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