javascript 复杂异步反应路由器v4示例
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import React, { PureComponent } from 'react'
import { Match, Miss, Redirect } from 'react-router'
const isAsyncCapable = typeof window !== 'undefined'
export default class Routes extends PureComponent {
constructor() {
super()
this.views = {}
this.redirs = [{
pattern: '/redirect',
to: '/',
}, {
pattern: '**/',
to: ({ location }) => location.pathname.slice(0, -1),
exactly: true,
}].map(redir => {
const { to } = redir
return {
...redir,
to: typeof to !== 'function' ? () => to : to
}
})
this.routes = [{
name: 'home',
pattern: '/',
exactly: true,
}, {
name: 'about',
pattern: '/about',
}, {
name: '404',
}].map(route => ({
...route,
component: this.loadView.bind(this, route.name),
}))
}
loadView(fileName) {
return isAsyncCapable ? this.asyncLoader(fileName) : this.syncLoader(fileName)
}
syncLoader(fileName) {
const View = require(`./views/${fileName}`)
return <View />
}
asyncLoader(fileName) {
const storedView = this.views[fileName]
if (storedView) {
delete this.views[fileName]
return storedView
}
new Promise(resolve => require.ensure([], require => {
resolve(require(`./views/${fileName}`).default)
}))
.then(View => this.views[fileName] = <View />)
.then(() => this.forceUpdate())
.catch(err => {
console.error(err)
throw new Error(err)
})
return <div />
}
renderRedirs() {
return this.redirs.map(redir => this.renderRedir(redir))
}
renderRedir({ pattern, exactly, to }) {
return <Match
key={pattern}
pattern={pattern}
exactly={exactly}
render={props => <Redirect to={to(props)} />}
/>
}
renderRoutes() {
return this.routes.map(route => this.renderRoute(route))
}
renderRoute({ name, pattern, exactly, component }) {
if (pattern) {
return <Match
key={name}
pattern={pattern}
exactly={exactly}
component={component}
/>
} else {
return <Miss
key={name}
component={component}
/>
}
}
render() { return (
<div>
{this.renderRoutes()}
{this.renderRedirs()}
</div>
)}
}
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