vue-router 源码之实现一个简单的 vue-router

<div id="app">
 <p>
  <router-link to="#/">home</router-link>
  <router-link to="#/book">book</router-link>
  <router-link to="#/movie">movie</router-link>
 </p>
 <router-view></router-view>
</div>

const Home = { template: '<div>home</div>' };
const Book = { template: '<div>book</div>' };
const Movie = { template: '<div>movie</div>' };

const routes = [
 { path: '/', component: Home },
 { path: '/book', component: Book },
 { path: '/movie', component: Movie }
];

const router = new VueRouter(Vue, {
 routes
});

new Vue({
 el: '#app'
});

class VueRouter {
 constructor (Vue, options) {
  this.$options = options;
 }
}

constructor (Vue, options) {
 this.init();
}

// 绑定事件
init () {
 window.addEventListener('load', this.onHashChange.bind(this), false);
 window.addEventListener('hashchange', this.onHashChange.bind(this), false);
}

constructor (Vue, options) {
 this.$options = options;
 this.routeMap = {};
 this.createRouteMap(this.$options);
}

// 路由映射表
createRouteMap (options) {
 options.routes.forEach(item => {
  this.routeMap[item.path] = item.component;
 });
}

const routes = [
 { path: '/', component: Home },
 { path: '/book', component: Book },
 { path: '/movie', component: Movie }
];

this.routeMap = {
 '/': Home,
 '/book': Book,
 '/movie': Movie
};

constructor (Vue, options) {
 this.app = new Vue({
  data: {
   current: '#/'
  }
 });
}

// 获取当前 hash 串
getHash () {
 return window.location.hash.slice(1) || '/';
}


// 设置当前路径
onHashChange () {
 this.app.current = this.getHash();
}

constructor (Vue, options) {
 this.initComponent(Vue);
}

// 注册组件
initComponent (Vue) {
 Vue.component('router-link', {
  props: {
   to: String
  },
  template: '<a :href="to" rel="external nofollow" rel="external nofollow" ><slot></slot></a>'
 });

 const _this = this;
 Vue.component('router-view', {
  render (h) {
   var component = _this.routeMap[_this.app.current];
   return h(component);
  }
 });
}

class VueRouter {
 constructor (Vue, options) {
  this.$options = options;
  this.routeMap = {};
  this.app = new Vue({
   data: {
    current: '#/'
   }
  });

  this.init();
  this.createRouteMap(this.$options);
  this.initComponent(Vue);
 }

 // 绑定事件
 init () {
  window.addEventListener('load', this.onHashChange.bind(this), false);
  window.addEventListener('hashchange', this.onHashChange.bind(this), false);
 }

 // 路由映射表
 createRouteMap (options) {
  options.routes.forEach(item => {
   this.routeMap[item.path] = item.component;
  });
 }

 // 注册组件
 initComponent (Vue) {
  Vue.component('router-link', {
   props: {
    to: String
   },
   template: '<a :href="to" rel="external nofollow" rel="external nofollow" ><slot></slot></a>'
  });

  const _this = this;
  Vue.component('router-view', {
   render (h) {
    var component = _this.routeMap[_this.app.current];
    return h(component);
   }
  });
 }

 // 获取当前 hash 串
 getHash () {
  return window.location.hash.slice(1) || '/';
 }

 // 设置当前路径
 onHashChange () {
  this.app.current = this.getHash();
 }
}