第九周作业

router.js

@@ -1,32 +1,74 @@
 function Router(routes, defaultRoute) {
-  //TODO
+  this.routes = routes
+  this.init(routes, defaultRoute)
+  this.history = []
+  this.index = -1
+  if (this.currentRoute) {
+    this.history.push(this.currentRoute.id)
+    this.index++
+  }
 }
 
 //初始化，可多次初始化
 Router.prototype.init = function(routes, defaultRoute) {
-  //TODO
-  this.currentRoute
-  this.oldRoute
+  this.currentRoute = routes.reduce((acc, curr) => {
+    if (!acc && curr.id === defaultRoute) {
+      return curr
+    }
+    return acc
+  }, null) || ''
+  this.oldRoute = ''
 }
 
 //切换路由
 Router.prototype.push = function(route, callback) {
-  //TODO
+  tempOldCurr = this.currentRoute || ''
+  this.changeRoute(route)
+  if (this.currentRoute !== tempOldCurr) {
+    this.history.push(this.currentRoute.id)
+    this.index++
+    if ((this.history.length > this.index - 1) && (this.index - 1 > -1)) {
+      this.oldRoute = this.history[this.index - 1]
+    }
+  }
+  return callback && callback()
 }
 
 //前进
 Router.prototype.forward = function () {
-  history.forward();
+  // history.forward();
+  this.index++
+  if ((this.history.length > this.index) && (this.index > -1)) {
+    this.changeRoute(this.history[this.index])
+  }
 }
 
 //后退
 Router.prototype.back = function () {
-  history.back();
+  // history.back();
+  this.index--
+  if ((this.history.length > this.index) && (this.index > -1)) {
+    this.changeRoute(this.history[this.index])
+  }
+}
+
+Router.prototype.replace = function(route) {
+  this.changeRoute(route)
+  this.history[this.index] = this.currentRoute
+}
+
+Router.prototype.changeRoute = function(route) {
+  this.currentRoute = this.routes.reduce((acc, curr) => {
+    if (!acc && curr.id === route) {
+      return curr
+    }
+    return acc
+  }, null) || this.currentRoute
 }
 
 //切换页面：route为字符串，为空则隐藏所有路由
 Router.prototype.changePage = function(route) {
-  //TODO
+  // TODO
 }
 
 module.exports = Router

test/index.spec.js

@@ -1,3 +1,5 @@
+// import { Router } from '../router'
+const Router = require('../router.js')
 describe('初始化路由', () => {
   it('default route', () => {
     //路由表