通过react dev tools可以很方便的审查react组件元素,但是有时候会因为审查元素无法显示正确的组件名而烦恼。比如
1. 被forwardRef 或 memo 包裹的组件名称的显示问题
import { forwardRef, memo } from "react";
const NextList = memo(() => {
return (
<div>
<b>list</b>
</div>
);
});
const Home = () => {
return (
<div>
<h2>home</h2>
<NextList></NextList>
</div>
);
};
并没有显示为NextList,应该怎么解决?
- 将被包裹的组件命名为List箭头函数
const List = () => {
return (
<div>
<b>list</b>
</div>
);
};
const NextList = memo(List);
- 将被包裹的组件命名为List普通函数
const NextList = memo(function List() {
return (
<div>
<b>list</b>
</div>
);
});
react dev tools显示的名称为被包裹组件的名称List,而不是NextList。
- 给包裹后的组件赋值displayName属性
const NextList = memo(function () {
return (
<div>
<b>list</b>
</div>
);
});
NextList.displayName = "List";
小结:个人觉得第二种办法比较方便,看个人习惯吧。
2. 没法区分不同的context
context.js
import { createContext } from "react";
export const ThemeContext = createContext(null);
export const SizeContext = createContext(null);
home.jsx
const Home = () => {
return (
<div>
<h2>home</h2>
<NextList></NextList>
<ThemeContext.Provider value={"dark"}>
<SizeContext.Provider value={"large"}>
<Product></Product>
</SizeContext.Provider>
</ThemeContext.Provider>
</div>
);
};
react dev tools并没有显示我们代码里的ThemeContext.Provider SizeContext.Provider
,解决办法displayName
import { createContext } from "react";
export const ThemeContext = createContext(null);
ThemeContext.displayName = "Theme";
export const SizeContext = createContext(null);
SizeContext.displayName = "Size";
在react-router@6的代码中也是这么处理的
export const LocationContext = React.createContext<LocationContextObject>(
null!
);
if (__DEV__) {
LocationContext.displayName = "Location";
}