allow global activeClass config

Author: yyx990803

src/components/link.js

@@ -14,10 +14,7 @@ export default {
     },
     append: Boolean,
     replace: Boolean,
-    activeClass: {
-      type: String,
-      default: 'router-link-active'
-    }
+    activeClass: String
   },
   render (h) {
     const router = this.$router
@@ -28,7 +25,8 @@ export default {
     const base = router.history.base
     const href = base ? cleanPath(base + fullPath) : fullPath
     const classes = {}
-    classes[this.activeClass] = isSameLocation(resolved, this.$route)
+    const activeClass = this.activeClass || router._options.linkActiveClass || 'router-link-active'
+    classes[activeClass] = isSameLocation(resolved, this.$route)
 
     return h(this.tag, {
       attrs: { href },

src/index.js

@@ -8,7 +8,7 @@ import { inBrowser, supportsHistory } from './util/dom'
 export default class VueRouter {
   constructor (options = {}) {
     this._rootComponent = null
-    this._activeViews = []
+    this._options = options
 
     this.match = createMatcher(options.routes || [])