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轮播图:1: 实现鼠标悬停时自动停止播放, 离开时又自动播放 2 加上翻页按按钮,实现向前和向后翻页播放 。 实例演示 xhr对象的使用

发布于:2022-04-14 13:17:49  栏目:技术文档

轮播图

图片:

lunbo

代码

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8" />
  5. <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6. <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7. <title>轮播图</title>
  8. <style>
  9. /* ! 3. 轮播图 */
  10. .slider {
  11. max-width: 750px;
  12. min-width: 320px;
  13. margin: auto;
  14. padding: 0 10px;
  15. }
  16. .slider .imgs {
  17. /* 图片容器必须要有高度,否则下面图片不能正常显示 */
  18. height: 150px;
  19. }
  20. .slider .imgs img {
  21. /* 图片完全充满父级空间显示 */
  22. height: 100%;
  23. width: 100%;
  24. /* 图片带有圆角 */
  25. border-radius: 10px;
  26. /* 默认图片全部隐藏,只有有active的图片才显示 */
  27. display: none;
  28. }
  29. .slider .imgs img:hover {
  30. cursor: pointer;
  31. }
  32. /* 默认显示第一张 */
  33. .slider .imgs img.active {
  34. display: block;
  35. }
  36. /* 轮播图按钮组 */
  37. .slider .btns {
  38. /* 按钮水平一排显示,用flex,且水平居中 */
  39. display: flex;
  40. place-content: center;
  41. }
  42. .slider .btns span {
  43. /* 按钮宽高相同,确定显示成一个正圆 */
  44. width: 8px;
  45. height: 8px;
  46. /* 加上红色背景和数字是为了布局时可以看到,一会更去掉 */
  47. background-color: rgba(255, 255, 255, 0.4);
  48. /* 50%可确保显示为正圆 */
  49. border-radius: 50%;
  50. /* 按钮上外边距负值,可将它上移,可移动到图片中下方 */
  51. margin: -12px 3px 5px;
  52. }
  53. .slider .btns span.active {
  54. background-color: #fff;
  55. }
  56. .slider .page {
  57. display: flex;
  58. place-content: space-between;
  59. margin-top: -88px;
  60. opacity: 0.3;
  61. }
  62. .slider .page button {
  63. border: none;
  64. }
  65. </style>
  66. <link
  67. rel="stylesheet"
  68. href="//at.alicdn.com/t/font_3280335_j9wms97sque.css"
  69. />
  70. </head>
  71. <body>
  72. <div class="slider">
  73. <div class="imgs">
  74. <img src="images/1.jpg" alt="" data-index="1" class="active" />
  75. <img src="images/2.jpg" alt="" data-index="2" />
  76. <img src="images/3.jpg" alt="" data-index="3" />
  77. <img src="images/4.jpg" alt="" data-index="4" />
  78. <img src="images/5.jpg" alt="" data-index="5" />
  79. </div>
  80. <div class="btns">
  81. <span data-index="1" class="active" onclick="setActive()"></span>
  82. <span data-index="2" onclick="setActive()"></span>
  83. <span data-index="3" onclick="setActive()"></span>
  84. <span data-index="4" onclick="setActive()"></span>
  85. <span data-index="5" onclick="setActive()"></span>
  86. </div>
  87. <div class="page">
  88. <button class="prev" onclick="setPage(1)">
  89. <i class="iconfont icon-shangyige"></i>
  90. </button>
  91. <button class="next" onclick="setPage(2)">
  92. <i class="iconfont icon-xiayige"></i>
  93. </button>
  94. </div>
  95. </div>
  96. <script>
  97. const imgs = document.querySelectorAll(".slider .imgs img");
  98. const btns = document.querySelectorAll(".slider .btns span");
  99. let iNow = 0;
  100. //清空class
  101. function claerClass() {
  102. imgs.forEach((img) => img.classList.remove("active"));
  103. btns.forEach((btn) => btn.classList.remove("active"));
  104. }
  105. //添加样式:翻页、自动播放、点击btn按钮
  106. function setActive(iNow) {
  107. //调用清空class自定义函数
  108. claerClass();
  109. //if判断iNow !== undefined :翻页、自动播放;else:点击btn按钮
  110. if (iNow !== undefined) {
  111. [...imgs].filter((img, index) => {
  112. if (iNow === index) {
  113. img.classList.add("active");
  114. }
  115. });
  116. [...btns].filter((btn, index) => {
  117. if (iNow === index) {
  118. btn.classList.add("active");
  119. }
  120. });
  121. } else {
  122. event.target.classList.add("active");
  123. imgs.forEach((img) => {
  124. if (img.dataset.index === event.target.dataset.index) {
  125. img.classList.add("active");
  126. }
  127. });
  128. }
  129. }
  130. //自动播放函数
  131. function setInteCanshu() {
  132. iNow++;
  133. if (iNow == btns.length) iNow = 0;
  134. setActive(iNow);
  135. }
  136. //设置翻页
  137. function setPage(ele) {
  138. // ele :1 上一页 2 下一页
  139. if (ele === 2) {
  140. iNow++;
  141. if (iNow == imgs.length) iNow = 0;
  142. setActive(iNow);
  143. } else {
  144. iNow--;
  145. if (iNow == -1) iNow = imgs.length - 1;
  146. setActive(iNow);
  147. }
  148. }
  149. //间隔2秒执行一次自动函数
  150. let setInte = setInterval(setInteCanshu, 2000);
  151. //获取整个div
  152. let slider = document.querySelector(".slider");
  153. //鼠标悬停时自动停止播放
  154. slider.onmouseover = () => clearInterval(setInte);
  155. //离开时又自动播放
  156. slider.onmouseout = () => (setInte = setInterval(setInteCanshu, 2000));
  157. </script>
  158. </body>
  159. </html>

实例演示ajax:xhr

代码:

  1. <script>
  2. let url = "";
  3. //ajax:xhr
  4. function getUser() {
  5. //创建对象
  6. const xhr = new XMLHttpRequest();
  7. //请求类型
  8. xhr.response("json");
  9. //配置参数
  10. xhr.open("GET", url);
  11. //请求成功
  12. xhr.onload = () => {
  13. console.log(xhr.response);
  14. };
  15. //请求失败
  16. xhr.onerror = () => {
  17. console.log("请求失败");
  18. };
  19. //发起请求
  20. xhr.send(null);
  21. }
  22. </script>
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