Question

我刚刚参加了一个关于React Native的项目，在那里我不断看到同时扩展React.Component和Component的类。

示例：

class SomeView extends React.Component

或

class OtherView extends Component

我们正在导入React, {Component} from React

是否有任何实际差异，如果有，哪一个？没有在网上找到任何信息。干杯！

Answer 1

你可以做任何你想做的事。

执行import { Component } from 'react'实际上与React.Component相同。

import { Component } from 'react'语法称为Named Import

import语句用于导入由另一个模块导出的绑定。

import defaultExport from "module-name";
import * as name from "module-name";
import { export } from "module-name";
import { export as alias } from "module-name";
import { export1 , export2 } from "module-name";
import { export1 , export2 as alias2 , [...] } from "module-name";
import defaultExport, { export [ , [...] ] } from "module-name";
import defaultExport, * as name from "module-name";
import "module-name";

Answer 2

import {Component} from 'react';

这称为命名模块导入。

The module to import from. This is often a relative or absolute path name to the .js file containing the module, excluding the .js extension. Certain bundlers may permit or require the use of the extension; check your environment. Only single quotes and double quotes Strings are allowed.

扩展React.Component与Component

2 个答案: