如果要创建组件,似乎可以用很多不同的方式创建类。这些有什么区别?我怎么知道要使用哪个?

import React, {Component} from 'react'

export default class Header extends Component {

}

export const Header = React.createClass({

})

export default React.createClass({

})

我只是假设他们做不同的事情,还是只是语法不同?

如果有人可以给我快速的解释或链接,我将不胜感激。我不想从一个新的框架开始,不知道到底有什么区别。

最佳答案

嗨,欢迎来到React!

我认为您在这里遇到的问题并不是与React特定的,而是与新的ES2015模块语法有关。在创建React类组件时,出于大多数意图和目的,您可以认为React.createClass在功能上等同于class MyComponent extends React.Component。一种只是使用新的ES2015类语法,而另一种则使用ES2015之前的语法。

为了学习模块,我建议阅读一些有关新模块语法的文章以使其熟悉。这是一个很好的开始:http://www.2ality.com/2014/09/es6-modules-final.html

简而言之,这些只是语法上的差异,但我将尝试快速浏览一下:

/**
 * This is how you import stuff.  In this case you're actually
 * importing two things:  React itself and just the "Component"
 * part from React.  Importing the "Component" part by itself makes it
 * so that you can do something like:
 *
 * class MyComponent extends Component ...
 *
 * instead of...
 *
 * class MyComponent extends React.Component
 *
 * Also note the comma below
 */
import React, {Component} from 'react';


/**
 * This is a "default" export.  That means when you import
 * this module you can do so without needing a specific module
 * name or brackets, e.g.
 *
 * import Header from './header';
 *
 * instead of...
 *
 * import { Header } from './header';
 */
export default class Header extends Component {

}

/**
 * This is a named export.  That means you must explicitly
 * import "Header" when importing this module, e.g.
 *
 * import { Header } from './header';
 *
 * instead of...
 *
 * import Header from './header';
 */
export const Header = React.createClass({

})

/**
 * This is another "default" export, only just with a
 * little more shorthand syntax.  It'd be functionally
 * equivalent to doing:
 *
 * const MyClass = React.createClass({ ... });
 * export default MyClass;
 */
export default React.createClass({

})

09-21 00:01