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cookie 保存和清除用户样式
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cookie 保存和清除用户样式

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>Title</title>
  7.     <style>
  8.         .container {
  9.             border: 1px solid #ccc;
  10.             width: 300px;
  11.             margin: 20px auto;
  12.             text-align: center;
  13.         }
  15.         .container > h1 {
  16.             margin: 100px auto;
  17.         }
  19.         body > form {
  20.             width: 350px;
  21.             margin: 20px auto;
  22.             display: flex;
  23.             justify-content: space-between;
  24.             align-items: center;
  25.         }
  26.     </style>
  28. </head>
  29. <body>
  31. <form action="">
  32.     <div>
  33.         <div>
  34.             <label for="bg">背景 rgb</label>
  35.             <input type="text" name="bg1" id="bg1" size="3" value="255">
  36.             <input type="text" name="bg2" id="bg2" size="3" value="255">
  37.             <input type="text" name="bg3" id="bg3" size="3" value="255">
  38.         </div>
  39.         <div>
  40.             <label for="color">字体 rgb</label>
  41.             <input type="text" name="color1" id="color1" size="3" value="0">
  42.             <input type="text" name="color2" id="color2" size="3" value="0">
  43.             <input type="text" name="color3" id="color3" size="3" value="0">
  44.         </div>
  45.     </div>
  46.     <div>
  47.         <input type="button" value="确定" id="ensure">
  48.         <input type="button" value="清理" id="clear">
  49.     </div>
  50. </form>
  52. <div class="container">
  53.     <h1 class="text">Hello world!</h1>
  54. </div>
  56. <script>
  57.     window.onload = initialize;
  59.     function initialize() {
  60.         var form = document.forms[0],
  61.             bg1 = getCookie('bg1') || 255,
  62.             bg2 = getCookie('bg2') || 255,
  63.             bg3 = getCookie('bg3') || 255,
  64.             color1 = getCookie('color1') || 0,
  65.             color2 = getCookie('color2') || 0,
  66.             color3 = getCookie('color3') || 0;
  68.         // 表单赋值
  69.         form.bg1.value = bg1;
  70.         form.bg2.value = bg2;
  71.         form.bg3.value = bg3;
  72.         form.color1.value = color1;
  73.         form.color2.value = color2;
  74.         form.color3.value = color3;
  76.         // 修改背景和字体颜色
  77.         document.getElementsByClassName('container')[0].style.backgroundColor = `rgb(${bg1}, ${bg2}, ${bg3})`;
  78.         document.getElementsByClassName('text')[0].style.color = `rgb(${color1}, ${color2}, ${color3})`;
  80.         // 绑定点击改变和删除背景和字体颜色事件
  81.         document.getElementById('ensure').onclick = changeAttr;
  82.         document.getElementById('clear').onclick = removeAttr;
  83.     }
  85.     function changeAttr() {
  86.         var form = document.forms[0],
  87.             bg1 = form.bg1.value,
  88.             bg2 = form.bg2.value,
  89.             bg3 = form.bg3.value,
  90.             color1 = form.color1.value,
  91.             color2 = form.color2.value,
  92.             color3 = form.color3.value;
  94.         // cookie 保存背景
  95.         setCookie('bg1', bg1);
  96.         setCookie('bg2', bg2);
  97.         setCookie('bg3', bg3);
  99.         // cookie 保存字体颜色
  100.         setCookie('color1', color1);
  101.         setCookie('color2', color2);
  102.         setCookie('color3', color3);
  104.         // 修改背景和字体颜色
  105.         document.getElementsByClassName('container')[0].style.backgroundColor = `rgb(${bg1}, ${bg2}, ${bg3})`;
  106.         document.getElementsByClassName('text')[0].style.color = `rgb(${color1}, ${color2}, ${color3})`;
  107.     }
  109.     function removeAttr() {
  110.         // cookie 删除背景
  111.         delCookie('bg1');
  112.         delCookie('bg2');
  113.         delCookie('bg3');
  115.         // cookie 删除字体颜色
  116.         delCookie('color1');
  117.         delCookie('color2');
  118.         delCookie('color3');
  120.         // 页面重载
  121.         location.reload();
  122.     }
  124.     function getCookie(name) {
  125.         var cookies = document.cookie ? document.cookie.split(';') : [];
  126.         for (var i = 0; i < cookies.length; i++) {
  127.             if (0 === cookies[i].trim().indexOf(name)) {
  128.                 return cookies[i].trim().split('=')[1].trimLeft();
  129.             }
  130.         }
  131.         return '';
  132.     }
  134.     function setCookie(name, value, expiredays = 30) {
  135.         var cookies = document.cookie ? document.cookie.split(';') : [], date = new Date();
  136.         date.setTime(date.getTime() + expiredays * 24 * 60 * 60 * 1000);
  138.         // 修改存在的 name, expires 值
  139.         for (var i = 0; i < cookies.length; i++) {
  140.             if (0 === cookies[i].trim().indexOf(name)) {
  141.                 var existName = true;
  142.                 cookies[i] = name + '=' + value;
  143.                 continue;
  144.             }
  145.             if (0 === cookies[i].trim().indexOf('expires')) {
  146.                 var existExpires = true;
  147.                 cookies[i] = 'expires=' + date.toUTCString();
  148.                 continue;
  149.             }
  150.             if (0 === cookies[i].trim().indexOf('path')) {
  151.                 var existPath = true;
  152.             }
  153.         }
  155.         // 添加未存在的 name, expires, path 值
  156.         if ('undefined' === typeof existName) {
  157.             cookies.unshift(name + '=' + value);
  158.         }
  159.         if ('undefined' === typeof existExpires) {
  160.             cookies.push('expires=' + date.toUTCString());
  161.         }
  162.         if ('undefined' === typeof existPath) {
  163.             cookies.push('path=/');
  164.         }
  166.         // 设置 cookie
  167.         document.cookie = cookies.join(';');
  168.     }
  170.     function delCookie(name) {
  171.         var cookies = document.cookie ? document.cookie.split(';') : [], date = new Date();
  172.         date.setTime(date.getTime() - 1);
  174.         // 删除存在的 name 值，修改 expires 值
  175.         for (var i = 0; i < cookies.length; i++) {
  176.             if (0 === cookies[i].trim().indexOf(name)) {
  177.                 cookies.splice(i, 1);
  178.             }
  179.             if (0 === cookies[i].trim().indexOf('expires')) {
  180.                 var existExpires = true;
  181.                 cookies[i] = 'expires=' + date.toUTCString();
  182.             }
  183.             if (0 === cookies[i].trim().indexOf('path')) {
  184.                 var existPath = true;
  185.             }
  186.         }
  188.         // 如果未存在 expires, path 值
  189.         if ('undefined' === typeof existExpires) {
  190.             cookies.push('expires=' + date.toUTCString());
  191.         }
  192.         if ('undefined' === typeof existPath) {
  193.             cookies.push('path=/');
  194.         }
  196.         // 设置 cookie
  197.         document.cookie = cookies.join(';');
  198.     }
  199. </script>
  201. </body>
  202. </html>

背景和字体颜色

  • 改变背景黄色和字体红色rgb值

改变背景和字体颜色

  • 刷新页面仍保持黄色背景，红色字体，点击清理，恢复原来样式
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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