Backbone.History

backbone.history

  Backbone.History.prototype.urlHistory = {
    stack: [],

    currentIndex: 0,

    current: function() {
      return this.stack[this.currentIndex];
    },

    previous: function() {
      return this.stack[this.currentIndex - 1];
    },

    next: function() {
      return this.stack[this.currentIndex + 1];
    },

    add: function(url) {
      // TODO: make this compatible with the browser back button.
      if (url === this.previous()) {
        this.currentIndex = this.currentIndex - 1;
        if (this.next()) { this.clearForward(); }
        window.history.back();
      } else {
        this.stack.push(url);
        this.currentIndex = this.stack.length - 1;
      }
      return true;
    },

    clearForward: function() {
      this.stack = this.stack.slice(0, this.currentIndex + 1);
    }
  };

can you post usage example?