add:React路由的使用
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@@ -58,7 +58,53 @@ Warning: Failed prop type: You provided a `value` prop to a form field without a
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<input type="text" value={this.state.msg} readOnly />
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```
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绑定 onChange 的举例如下:(通过onChange方法,实现双向数据绑定)
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**绑定 onChange 的举例如下**:(通过onChange方法,实现双向数据绑定)
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(1)index.html:
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```html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Document</title>
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</head>
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<body>
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<!-- 容器,通过 React 渲染得到的 虚拟DOM,会呈现到这个位置 -->
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<div id="app"></div>
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</body>
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</html>
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```
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(2)main.js:
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```javascript
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// JS打包入口文件
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// 1. 导入包
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import React from "react";
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import ReactDOM from "react-dom";
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// 导入组件
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import MyComponent from "./components/MyComponent.jsx";
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// 使用 render 函数渲染 虚拟DOM
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ReactDOM.render(
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<div>
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<MyComponent></MyComponent>
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</div>,
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document.getElementById("app")
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);
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```
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(3)components/MyComponent.jsx
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```javascript
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import React from "react";
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@@ -103,3 +149,17 @@ export default class MyComponent extends React.Component {
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```
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工程文件:
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- [2019-02-13-ReactDemo.zip]()
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249
13-React基础/07-React路由的使用.md
Normal file
249
13-React基础/07-React路由的使用.md
Normal file
@@ -0,0 +1,249 @@
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## React路由的使用
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使用React路由之前,我们需要先安装 `react-router-dom`这个包。比如:
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```
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yarn add react-router-dom
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```
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代码举例:
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(1)index.html
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```html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Document</title>
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</head>
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<body>
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<!-- 容器,通过 React 渲染得到的 虚拟DOM,会呈现到这个位置 -->
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<div id="app"></div>
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</body>
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</html>
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```
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(2)main.js:
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```javascript
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// JS打包入口文件
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// 1. 导入包
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import React from "react";
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import ReactDOM from "react-dom";
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import App from "./App.jsx";
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// 使用 render 函数渲染 虚拟DOM
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ReactDOM.render(<App />, document.getElementById("app"));
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```
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(3)app.jsx:
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```java
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import React from "react";
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// 如果要使用 路由模块,第一步,运行 yarn add react-router-dom
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// 第二步,导入 路由模块
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// HashRouter 表示一个路由的跟容器,将来,所有的路由相关的东西,都要包裹在 HashRouter 里面,而且,一个网站中,只需要使用一次 HashRouter 就好了;
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// Route 表示一个路由规则, 在 Route 上,有两个比较重要的属性, path component
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// Link 表示一个路由的链接 ,就好比 vue 中的 <router-link to=""></router-link>
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import { HashRouter, Route, Link } from "react-router-dom";
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import Home from "./components/Home.jsx";
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import Movie from "./components/Movie.jsx";
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import About from "./components/About.jsx";
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export default class App extends React.Component {
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constructor(props) {
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super(props);
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this.state = {};
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}
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render() {
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// 当 使用 HashRouter 把 App 根组件的元素包裹起来之后,网站就已经启用路由了
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// 在一个 HashRouter 中,只能有唯一的一个根元素
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// 在一个网站中,只需要使用 唯一的一次 <HashRouter></HashRouter> 即可
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return (
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<HashRouter>
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<div>
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<h1>这是网站的APP根组件</h1>
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<hr />
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<Link to="/home">首页</Link>
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<Link to="/movie">电影</Link>
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<Link to="/about">关于</Link>
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<hr />
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{/* Route 创建的标签,就是路由规则,其中 path 表示要匹配的路由,component 表示要展示的组件 */}
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{/* 在 vue 中有个 router-view 的路由标签,专门用来放置,匹配到的路由组件的,但是,在 react-router 中,并没有类似于这样的标签,而是 ,直接把 Route 标签,当作的 坑(占位符) */}
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{/* Route 具有两种身份:1. 它是一个路由匹配规则; 2. 它是 一个占位符,表示将来匹配到的组件都放到这个位置 */}
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<Route path="/home" component={Home} />
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<hr />
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<Route path="/movie" component={Movie} />
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<hr />
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<Route path="/about" component={About} />
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</div>
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</HashRouter>
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);
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}
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}
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```
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(4)ReactDemo/src/components/Home.jsx
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```java
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import React from "react";
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export default class Home extends React.Component {
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constructor(props) {
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super(props);
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this.state = {};
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}
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render() {
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return <div>Home组件</div>;
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}
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}
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```
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(5)ReactDemo/src/components/Movie.jsx
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```java
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import React from "react";
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export default class Movie extends React.Component {
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constructor(props) {
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super(props);
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this.state = {};
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}
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render() {
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return <div>Movie组件</div>;
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}
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}
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```
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(6)ReactDemo/src/components/About.jsx
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```java
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import React from "react";
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export default class About extends React.Component {
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constructor(props) {
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super(props);
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this.state = {};
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}
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render() {
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return <div>About组件</div>;
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}
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}
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```
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运行结果:
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20190214_1000.png
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## 匹配路由参数
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### 模糊匹配与精准匹配
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我们在上面的代码中,进一步修改。假设 Movie 这个组件修改成这种路由匹配方式:
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```html
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<Link to="/movie/top250">电影</Link>
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<Route path="/movie" component={Movie} />
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```
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上面这种匹配方式,也是可以成功匹配到的。这是为啥呢?
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这是因为:默认情况下,路由中的匹配规则,是**模糊匹配**的。如果 路由可以部分匹配成功,就会展示这个路由对应的组件。
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如果想让路由规则,进行**精确匹配**,可以为Route添加 `exact` 属性。比如下面这种写法,因为是开启了精准匹配,所以是匹配不到的:(无法匹配)
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```html
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<Link to="/movie/top250/20">电影</Link>
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<Route path="/movie/" component={Movie} exact/>
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```
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另外,如果要匹配参数,可以在匹配规则中,使用 `:` 修饰符,表示这个位置匹配到的是参数。举例如下:(匹配正常)
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```html
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<Link to="/movie/top250/20">电影</Link>
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<Route path="/movie/:type/:id" component={Movie} exact/>
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```
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### 获取路由参数
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继续修改上面的代码。如果我想在 Movie 组件中显示路由中的参数,怎么做呢?
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我们可以通过 `props.match.params`获取路由中的参数。举例做法如下:
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app.jsx中的匹配规则如下:
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```html
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<Link to="/movie/top100/5">电影</Link>
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<Route path="/movie/:type/:id" component={Movie} exact/>
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```
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Moivie 组件的写法如下:
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```java
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import React from "react";
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export default class Movie extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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routeParams: props.match.params // 把路由中的参数保存到 state 中
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};
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}
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render() {
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console.log(this);
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// 如果想要从路由规则中,提取匹配到的参数,进行使用,可以使用 this.props.match.params.*** 来访问
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return (
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<div>
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{/* Movie --- {this.props.match.params.type} --- {this.props.match.params.id} */}
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Movie --- {this.state.routeParams.type} --- {this.state.routeParams.id}
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</div>
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);
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}
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}
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```
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打印结果如下:
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20190214_1030.png
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工程文件:
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2019-02-14-ReactDemo.zip
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