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简单导航的简单实现
Aloc
Original
739 people have browsed it

简单导航的实现

html主要部分

  1. <header class="head">
  2. <ul class="head-ul clear">
  3. <li><a href="">首页</a></li>
  4. <li><a href="">关于前端</a></li>
  5. <li>
  6. <a href="">前端三宝</a>
  7. <ul class="submenu">
  8. <li><a href="">html</a></li>
  9. <li><a href="">css</a></li>
  10. <li><a href="">javascript</a></li>
  11. </ul>
  12. </li>
  13. <li>
  14. <a href="">资源下载</a>
  15. <ul class="submenu">
  16. <li><a href="">php工具</a></li>
  17. <li><a href="">php手册</a></li>
  18. <li><a href="">php课件</a></li>
  19. </ul>
  20. </li>
  21. <li><a href="tel: 182****">电话联系</a></li>
  22. <li><a href="mailto: 182***@qq.com">邮件联系</a></li>
  23. </ul>
  24. </header>

以上html涉及到了a标签的几种用法,链接、电话、邮件


css主要部分

  1. /* css reset */
  2. * {
  3. margin: 0;
  4. padding: 0;
  5. box-sizing: border-box;
  6. }
  7. li {
  8. list-style: none;
  9. }
  10. a {
  11. text-decoration: none;
  12. }
  13. .clear {
  14. zoom: 1;
  15. }
  16. .clear:after {
  17. visibility: hidden;
  18. display: block;
  19. content: " ";
  20. clear: both;
  21. height: 0;
  22. font-size: 0;
  23. }
  24. /* css reset end */
  25. .head {
  26. position: fixed;
  27. left: 0;
  28. top: 0;
  29. width: 100%;
  30. height: 50px;
  31. background: #000;
  32. }
  33. .head-ul {
  34. position: absolute;
  35. left: 50%;
  36. top: 50%;
  37. transform: translate(-50%, -50%);
  38. }
  39. /* 父级li设置相对定位 */
  40. .head-ul > li {
  41. position: relative;
  42. float: left;
  43. margin: 0 20px;
  44. }
  45. .head-ul > li > a {
  46. display: block;
  47. font-size: 16px;
  48. line-height: 50px;
  49. color: #f7f7f7;
  50. }
  51. .head-ul .submenu {
  52. display: none;
  53. position: absolute;
  54. left: 50%;
  55. top: 50px;
  56. min-width: 100px;
  57. padding: 10px 20px;
  58. transform: translateX(-50%);
  59. background: #000;
  60. }
  61. .head-ul .submenu a {
  62. display: block;
  63. font-size: 14px;
  64. text-align: center;
  65. line-height: 30px;
  66. color: #f7f7f7;
  67. }

以上css主要涉及到了浮动,清浮动,定位


js主要部分

  1. // 获取元素
  2. const lis = document.querySelectorAll(".head-ul>li");
  3. // 遍历元素
  4. lis.forEach(function (li) {
  5. // 添加鼠标移入监听事件
  6. li.addEventListener("mouseover", showSubMenu);
  7. // 添加鼠标移入监听事件
  8. li.addEventListener("mouseout", hideSubMenu);
  9. });
  10. // 显示二级菜单,showSubMenu
  11. function showSubMenu(ev) {
  12. // 判断是否有二级菜单,触发目标a标签后面是否有相邻元素
  13. if (ev.target.nextElementSibling !== null) {
  14. ev.target.nextElementSibling.style.display = "block";
  15. }
  16. }
  17. // 关闭二级菜单,hideSubMenu
  18. function hideSubMenu(ev) {
  19. if (
  20. ev.target.nodeName === "A" &&
  21. ev.target.nextElementSibling !== null
  22. ) {
  23. ev.target.nextElementSibling.style.display = "none";
  24. }
  25. }

以上js主要涉及到了获取dom元素,遍历,添加事件监听,事件代理


小结

另外,本demo,有个bug,即无论如何也点不了二级菜单,因为鼠标一离开a标签,二级导航就隐藏掉了,后续待完善,将触发目标转移到li上即可

Correcting teacher:WJWJ

Correction status:qualified

Teacher's comments:功能实现了,最好附上效果图!
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