各位大佬, axios 异步请求,回调函数获取全局变量为空,怎么解决这个问题啊? - V2EX
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qwertty01
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各位大佬, axios 异步请求,回调函数获取全局变量为空,怎么解决这个问题啊?

  •  1
     
  •   qwertty01 2020-09-23 20:54:04 +08:00 1779 次点击
    这是一个创建于 1890 天前的主题,其中的信息可能已经有所发展或是发生改变。

    RT,在线等

    第 1 条附言    2020-09-23 21:51:27 +08:00
    export const CompOnent= () => {
    let growl

    const OnSubmitHandler= () => {
    axios.post(url, {
    }).then(res => {
    const.log(growl)
    })
    }
    return (
    <div>
    <Growl ref={(el) => growl = el} style={{marginTop: '75px'}}/>
    </div>
    )
    }
    5 条回复    2020-09-23 22:21:39 +08:00
    35aZ4P8mT576683q
        1
    35aZ4P8mT576683q  
       2020-09-23 21:00:01 +08:00 via Android
    Talk is cheap
    SilencerL
        2
    SilencerL  
       2020-09-23 21:15:02 +08:00 via iPhone
    Show me the fucking code.
    qwertty01
        3
    qwertty01  
    OP
       2020-09-23 21:52:02 +08:00
    @liberty1900 @SilencerL 麻烦大佬帮忙看一下
    Danswerme
        4
    Danswerme  
       2020-09-23 22:06:08 +08:00
    你这是要拿到 ref ? 函数式组件的话可以用 useRef
    import { useRef } from "react";
    ...

    let growl = useRef(null);

    文档见此 https://zh-hans.reactjs.org/docs/hooks-reference.html#useref

    另外你 then 里面的 const.log 是什么玩意?
    qwertty01
        5
    qwertty01  
    OP
       2020-09-23 22:21:39 +08:00
    @Danswerme 多谢大佬指点,ref 这块一直没太学明白。
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