<ul> 
 <li><a href="#/">首页</a></li> 
 <li><a href="#/product">产品</a></li> 
 <li><a href="#/server">服务</a></li> 
</ul>
<div id="result"></div>

function Router(){
 this.routes = {};
 this.curUrl = '';

 this.route = function(path, callback){
  this.routes[path] = callback || function(){};
 };

 this.refresh = function(){
  this.curUrl = location.hash.slice(1) || '/';
  this.routes[this.curUrl]();
 };

 this.init = function(){
  window.addEventListener('load', this.refresh.bind(this), false);
  window.addEventListener('hashchange', this.refresh.bind(this), false);
 }
}

var R = new Router();
R.init();
var res = document.getElementById('result');

 R.route('/', function() {
 res.style.background = 'blue';
 res.innerHTML = '这是首页';
 });
 R.route('/product', function() {
  res.style.background = 'orange';
 res.innerHTML = '这是产品页';
 });
 R.route('/server', function() {
  res.style.background = 'black';
 res.innerHTML = '这是服务页';
 });