history路由的使用

<div class="container">
    <nav>
        <p><button class="back">back</button></p>
        <p><button class="go">go</button></p>
        <p><button class="pushstate">pushState</button></p>
        <p><button class="replacestate">replaceState</button></p>
    </nav>
    <div id="app">
        <p class="current">当前URL：<span></span></p>
        <p class="history-len">历史记录的长度：<span></span></p>
    </div>
</div>

class HistoryRouter {
  currentUrl = "";
  handlers = {};

  constructor() {
    this.refresh = this.refresh.bind(this);
    this.addStateListener();
    window.addEventListener("load", this.refresh, false);
    window.addEventListener("popstate", this.refresh, false);
    window.addEventListener("pushState", this.refresh, false);
    window.addEventListener("replaceState", this.refresh, false);
  }
  addStateListener() {
    const listener = 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;
      };
    };
    window.history.pushState = listener("pushState");
    window.history.replaceState = listener("replaceState");
  }
  refresh(event) {
    this.currentUrl = location.pathname;
    this.emit("change", location.pathname);
    document.querySelector("#app span").innerHTML = location.pathname;
  }
  on(evName, listener) {
    this.handlers[evName] = listener;
  }
  emit(evName, ...args) {
    const handler = this.handlers[evName];
    if (handler) {
      handler(...args);
    }
  }
}
const router = new HistoryRouter();
router.on("change", function (curUrl) {
  console.log(curUrl);
  document.querySelector(".current span").innerHTML = curUrl;
  document.querySelector(".history-len span").innerHTML = history.length;
});

document.querySelector(".back").addEventListener("click", function () {
  window.history.back();
});
document.querySelector(".go").addEventListener("click", function () {
  window.history.go(1);
});
document.querySelector(".pushstate").addEventListener("click", function () {
  const url = Math.random().toString(36).slice(-6) + ".html";
  window.history.pushState({}, "", url);
});
document.querySelector(".replacestate").addEventListener("click", function () {
  const url = Math.random().toString(36).slice(-6) + ".html";
  window.history.replaceState({}, "", url);
});