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访问器属性和获取dom元素
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访问器属性

效果图：

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>访问器属性</title>
  8.   </head>
  9.   <body>
  10.     <script>
  11.       //访问器属性
  12.       let user = {
  13.         //常规属性
  14.         data: {
  15.           name: '吴彦祖',
  16.           age: 18,
  17.         },
  18.         //获取年龄
  19.         getAge() {
  20.           return this.data.age;
  21.         },
  22.         //设置年龄
  23.         setAge(age) {
  24.           if (age >= 18 && age <= 120) {
  25.             this.data.age = age;
  26.           } else {
  27.             console.log('非法数据');
  28.           }
  29.         },
  30.       };
  31.       console.log(user.getAge());
  32.       user.setAge(80);
  33.       console.log(user.getAge());
  35.       // 对于用户来说,获取年龄,习惯性会用这种方式来获取
  36.       // console.log(user.age);
  37.       // console.log(user.data.age);
  39.       user = {
  40.         //常规属性
  41.         data: {
  42.           name: '彭于晏',
  43.           age: 18,
  44.         },
  45.         //将传统的方法。修改一个伪装成属性的方法
  46.         get age() {
  47.           return this.data.age;
  48.         },
  49.         // 设置年龄，将之前的设置方法修改成一个属性
  50.         // 方法->属性：伪装成方法的属性，“访问器属性”
  51.         set age(age) {
  52.           if (age >= 18 && age <= 120) {
  53.             this.data.age = age;
  54.           } else {
  55.             console.log('非法数据');
  56.           }
  57.         },
  58.       };
  59.       console.log(user.age);
  60.       user.age = 150;
  61.       console.log(user.age);
  63.       // 访问器属性,本质上还是方法,调用时,用的属性访问的语法
  64.     </script>
  65.   </body>
  66. </html>

获取DOM元素

效果图

代码

  2. <!DOCTYPE html>
  3. <html lang="en">
  4.   <head>
  5.     <meta charset="UTF-8" />
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  8.     <title>获取dom元素</title>
  9.   </head>
  10.   <body>
  11.     <ul class="list">
  12.       <li class="item">0</li>
  13.       <li class="item">1</li>
  14.       <li class="item">2</li>
  15.       <li class="item">3</li>
  16.       <li class="item">4</li>
  17.     </ul>
  19.     <script>
  20.       //1. 将所有的li.item 变成红色
  21.       console.dir(document);
  22.       //querySelectorAll(selector):返回一组元素
  23.       console.dir(document.querySelectorAll('.item'));
  24.       const items = document.querySelectorAll('.item');
  26.       for (let i = 0; i < items.length; i++) {
  27.         //console.log(items[i]);
  28.         items[i].style.color = 'red';
  29.       }
  31.       //2. 将第一个改为蓝色
  32.       //querySelector: 返回一组元素中的第一个，只返回一个，而不是一组
  33.       const firstItem = document.querySelector('.item');
  34.       firstItem.style.color = 'blue';
  36.       console.log(document.querySelector('body'));
  37.       console.log(document.body);
  38.       console.log(document.head);
  39.       console.log(document.title);
  41.       //获取html
  42.       console.log(document.documentElement);
  43.     </script>
  44.   </body>
  45. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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