监听history

var _wr = function(type) {
   var orig = history[type];
   return function() {
       var rv = orig.apply(this, arguments);
      var e = new Event(type);
       e.arguments = arguments;
       window.dispatchEvent(e);
       return rv;
   };
};
 history.pushState = _wr('pushState');
 history.replaceState = _wr('replaceState');
window.addEventListener('replaceState', function(e) {
  console.log('THEY DID IT AGAIN! replaceState 111111');
});
window.addEventListener('pushState', function(e) {
  console.log('THEY DID IT AGAIN! pushState 2222222');
});

第二种

var addHistoryMethod = (function(){
        var historyDep = new Dep();
        return function(name) {
            if(name === 'historychange'){
                return function(name, fn){
                    var event = new Watch(name, fn)
                    Dep.watch = event;
                    historyDep.defined();
                    Dep.watch = null;       //置空供下一个订阅者使用
                }
            } else if(name === 'pushState' || name === 'replaceState') {
                var method = history[name];
                return function(){
                    method.apply(history, arguments);
                    historyDep.notify();
                }
            }
            
        }
}())

window.addHistoryListener = addHistoryMethod('historychange');
history.pushState =  addHistoryMethod('pushState');
history.replaceState =  addHistoryMethod('replaceState');
window.addHistoryListener('history',function(){
    console.log('窗口的history改变了');
})
window.addHistoryListener('history',function(){
    console.log('窗口的history改变了-我也听到了');
})
history.pushState({first:'first'}, "page2", "/first")