fix: 1.在state外操作state；2.map缺少key；3.类型定义；4.行内样式修正； #2
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xiaohuoni
reviewed
Jul 28, 2020
| style={{ fontSize: ".6rem" }} // fixed: 适配一下 | ||
| onClick={() => { | ||
| setstate(state + 1); | ||
| layoutEmitter.emit({ state }); // unfixed: 父组件订阅不到初次的状态。 可以 emit({state + 1})，但不想被骂。 |
| @@ -1,15 +1,29 @@ | |||
| import React, { useState } from 'react'; | |||
| import { layoutEmitter } from '@/utils/EventEmitter'; | |||
| // import React, { useState, useEffect } from 'react'; | |||
src/pages/index.tsx
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| // list.push(data); | ||
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| // fixed: 不能在 setState 外直接操作 state，react 数据的不可变性。 | ||
| // 直接操作 state 会导致之前的变更无效（应该是这个原因），所以 DOM 不会重新渲染。 |
src/pages/index.tsx
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| return; | ||
| } | ||
| }); | ||
| }, [list.length]); |
src/pages/index.tsx
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| <p>list length:{list.length}</p> | ||
| { | ||
| list.map(({ state }) => ( | ||
| <p key={`_${state}`}>{state}</p> |
| layoutEmitter.emit({ state }); | ||
| }} | ||
| >EventEmitter {state} </button> | ||
| // useEffect(() => { // unfixed: 可以在这里解决，但第一次 this._subscription 未初始化，不是个对象，会报错。 |
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无用注释，都不要留着。
我不骂你，扣点分，不过分吧？
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