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html history router

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Html History</title>
  </head>
  <body>
    <nav>
      <a href="/">首页</a>
      <a href="/product">产品</a>
      <a href="/price">价格</a>
    </nav>
    <!-- 变化的区域内容 -->
    <div class="route-content"></div>
  </body>

  <script type="text/javascript">
    const routes = [
      {
        path: "/",
        component: "我是首页"
      },
      {
        path: "/product",
        component: "我是产品"
      },
      {
        path: "/price",
        component: "我是价格"
      }
    ]

    document.querySelector("nav").onclick = (event) => {
      let { pathname, tagName } = event.target
      // 如果点击的不是链接，跳过
      if (tagName !== "A") return
      // 1-参数
      // 2-title，没用，被浏览器忽略
      // 3-path路径
      history.pushState({}, "", pathname)
      changeRoute()
      event.preventDefault()
    }

    const changeRoute = () => {
      // path路径
      let pathname = location.pathname
      // 找到匹配的path路径
      let route = routes.find((route) => route.path === pathname)
      // 设置区域内容
      if (route) {
        document.querySelector(".route-content").innerHTML = route.component
      }
    }
    // 设置首页
    history.pushState({}, "", "/route")
    changeRoute()
    // 监听history变化：只能监听pop,go,back,forward方法，pushState没用
    window.onpopstate = () => changeRoute()
  </script>
</html>