refactor(router): dupports multiple mode

src/core/router/history/abstract.js

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+import { History } from './base'
+
+export class AbstractHistory extends History {
+  constructor (config) {
+    super(config)
+    this.mode = 'abstract'
+  }
+}

src/core/router/history/base.js

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+import { getBasePath, getPath, isAbsolutePath } from '../util'
+import { noop } from '../../util/core'
+
+function getAlias (path, alias) {
+  return alias[path] ? getAlias(alias[path], alias) : path
+}
+
+function getFileName (path) {
+  return /\.(md|html)$/g.test(path)
+    ? path
+    : /\/$/g.test(path)
+      ? `${path}README.md`
+      : `${path}.md`
+}
+
+export class History {
+  constructor (config) {
+    this.config = config
+  }
+
+  onchange (cb = noop) {
+    cb()
+  }
+
+  getFile (path) {
+    const { config } = this
+    const base = getBasePath(config.basePath)
+
+    path = config.alias ? getAlias(path, config.alias) : path
+    path = getFileName(path)
+    path = path === '/README.md' ? (config.homepage || path) : path
+    path = isAbsolutePath(path) ? path : getPath(base, path)
+
+    return path
+  }
+
+  getCurrentPath () {}
+
+  normalize () {}
+
+  parse () {}
+
+  toURL () {}
+}

src/core/router/history/hash.js

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+import { History } from './base'
+import { merge, cached, noop } from '../../util/core'
+import { parseQuery, stringifyQuery, cleanPath } from '../util'
+import { on } from '../../util/dom'
+
+function replaceHash (path) {
+  const i = location.href.indexOf('#')
+  location.replace(
+    location.href.slice(0, i >= 0 ? i : 0) + '#' + path
+  )
+}
+
+const replaceSlug = cached(path => {
+  return path.replace('#', '?id=')
+})
+
+export class HashHistory extends History {
+  constructor (config) {
+    super(config)
+    this.mode = 'hash'
+  }
+
+  getCurrentPath () {
+    // We can't use location.hash here because it's not
+    // consistent across browsers - Firefox will pre-decode it!
+    const href = location.href
+    const index = href.indexOf('#')
+    return index === -1 ? '' : href.slice(index + 1)
+  }
+
+  onchange (cb = noop) {
+    on('hashchange', cb)
+  }
+
+  normalize () {
+    let path = this.getCurrentPath()
+
+    path = replaceSlug(path)
+
+    if (path.charAt(0) === '/') return replaceHash(path)
+    replaceHash('/' + path)
+  }
+
+  /**
+   * Parse the url
+   * @param {string} [path=location.herf]
+   * @return {object} { path, query }
+   */
+  parse (path = location.href) {
+    let query = ''
+
+    const queryIndex = path.indexOf('?')
+    if (queryIndex >= 0) {
+      query = path.slice(queryIndex + 1)
+      path = path.slice(0, queryIndex)
+    }
+
+    const hashIndex = path.indexOf('#')
+    if (hashIndex) {
+      path = path.slice(hashIndex + 1)
+    }
+
+    return { path, query: parseQuery(query) }
+  }
+
+  toURL (path, params, currentRoute) {
+    const local = currentRoute && path[0] === '#'
+    const route = this.parse(replaceSlug(path))
+
+    route.query = merge({}, route.query, params)
+    path = route.path + stringifyQuery(route.query)
+    path = path.replace(/\.md(\?)|\.md$/, '$1')
+
+    if (local) path = currentRoute + path
+
+    return cleanPath('#/' + path)
+  }
+}

src/core/router/history/html5.js

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+import { History } from './base'
+
+export class HTML5History extends History {
+  constructor (config) {
+    super(config)
+    this.mode = 'history'
+  }
+}