在学react-router，看到一个关于clean-url,不懂，请教大神。

这clean url 具体又什么用

---

README.md开始

# Clean URLs with Browser History The URLs in our app right now are built on a hack: the hash. It's the default because it will always work, but there's a better way. Modern browsers let JavaScript manipulate the URL without making an http request, so we don't need to rely on the hash (`#`) portion of the url to do routing, but there's a catch (we'll get to it later). ## Configuring Browser History Open up `index.js` and import `browserHistory` instead of `hashHistory`.

// index.js
// ...
// bring inbrowserHistoryinstead ofhashHistory
import { Router, Route, browserHistory, IndexRoute } from 'react-router'

render((

{/* ... */}

), document.getElementById('app'))

Now go click around and admire your clean URLs. Oh yeah, the catch. Click on a link and then refresh your browser. What happens?

Cannot GET /repos

## Configuring Your Server Your server needs to deliver your app no matter what URL comes in, because your app, in the browser, is manipulating the URL. Our current server doesn't know how to handle the URL. The Webpack Dev Server has an option to enable this. Open up `package.json` and add `--history-api-fallback`.

"start": "webpack-dev-server --inline --content-base . --history-api-fallback"

We also need to change our relative paths to absolute paths in `index.html` since the URLs will be at deep paths and the app, if it starts at a deep path, won't be able to find the files.

Stop your server if it's running, then `npm start` again. Look at those clean URLs :) --- [Next: Production-ish Server](../11-productionish-server/)

README.md 结束

index.js

import React from 'react' import { render } from 'react-dom' import { Router, Route, hashHistory, IndexRoute } from 'react-router' import App from './modules/App' import About from './modules/About' import Repos from './modules/Repos' import Repo from './modules/Repo' import Home from './modules/Home' render((          ), document.getElementById('app'))

package.json

{ "name": "tutorial", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "start": "webpack-dev-server --inline --content-base ." }, "author": "", "license": "ISC", "dependencies": { "react": "^0.14.7", "react-dom": "^0.14.7", "react-router": "^2.0.0" }, "devDependencies": { "babel-core": "^6.5.1", "babel-loader": "^6.2.2", "babel-preset-es2015": "^6.5.0", "babel-preset-react": "^6.5.0", "http-server": "^0.8.5", "webpack": "^1.12.13", "webpack-dev-server": "^1.14.1" } }

index.html

about.js

import React from 'react' export default React.createClass({ render() { return 
About
 } })

app.js

import React from 'react' import NavLink from './NavLink' export default React.createClass({ render() { return ( 
 
React Router Tutorial
 
 
Home
 
About
 
Repos
 
 {this.props.children} 
 ) } })

Home.js

import React from 'react' export default React.createClass({ render() { return 
Home
 } })

NavLink.js

// modules/NavLink.js import React from 'react' import { Link } from 'react-router' export default React.createClass({ render() { return  } })

Repo.js

import React from 'react' export default React.createClass({ render() { return ( 
 
{this.props.params.repoName}
 
 ) } })

Repos.js

import React from 'react' import NavLink from './NavLink' export default React.createClass({ render() { return ( 
 
Repos
 
 
React Router
 
React
 
 {this.props.children} 
 ) } })