新浪下拉菜单

 

 

 

 

 

 

  <body>
    <ul>
      <li id="top">微博</li>
      <li class="hide">私信</li>
      <li class="hide">评论</li>
      <li class="hide">@我</li>
    </ul>
  </body>
  <script>
    // 大概方法：
    // 1.获取元素
    var nav = document.querySelector(".nav");
    var lis = nav.children; //得到4个li
    // 循环注册事件
    for (let i = 0; i < lis.length; i++) {
      lis[i].onmouseover = function () {
        this.children[1].style.display = "block";
      };
      lis[i].onmouseout = function () {
        this.children[1].style.display = "none";
      };
    }
  </script>

  <script>
    var top = document.getElementById("top");
    var hide = document.getElementsByClassName("hide"); //返回的是一个元素集合
    var ul = document.querySelector("ul");
    // console.log('123');
    ul.onmouseover = function () {
      //使用top.onmouseover时会在鼠标一离开zd元素时，下拉菜单立即隐藏，应该效果一样才对啊？
      hide[0].style.display = "block";
      hide[1].style.display = "block";
      hide[2].style.display = "block";
    };
    ul.onmouseout = function () {
      hide[0].style.display = "none";
      hide[1].style.display = "none";
      hide[2].style.display = "none";
    };
  </script>

 

posted @ 2022-04-18 11:21  罗砂  阅读(74)  评论(0)    收藏  举报