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访问器属性

效果图：

代码

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>访问器属性</title>
  </head>
  <body>
    <script>
      //访问器属性
      let user = {
        //常规属性
        data: {
          name: '吴彦祖',
          age: 18,
        },
        //获取年龄
        getAge() {
          return this.data.age;
        },
        //设置年龄
        setAge(age) {
          if (age >= 18 && age <= 120) {
            this.data.age = age;
          } else {
            console.log('非法数据');
          }
        },
      };
      console.log(user.getAge());
      user.setAge(80);
      console.log(user.getAge());
      // 对于用户来说,获取年龄,习惯性会用这种方式来获取
      // console.log(user.age);
      // console.log(user.data.age);
      user = {
        //常规属性
        data: {
          name: '彭于晏',
          age: 18,
        },
        //将传统的方法。修改一个伪装成属性的方法
        get age() {
          return this.data.age;
        },
        // 设置年龄，将之前的设置方法修改成一个属性
        // 方法->属性：伪装成方法的属性，“访问器属性”
        set age(age) {
          if (age >= 18 && age <= 120) {
            this.data.age = age;
          } else {
            console.log('非法数据');
          }
        },
      };
      console.log(user.age);
      user.age = 150;
      console.log(user.age);
      // 访问器属性,本质上还是方法,调用时,用的属性访问的语法
    </script>
  </body>
</html>

获取DOM元素

效果图

代码


<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>获取dom元素</title>
  </head>
  <body>
    <ul class="list">
      <li class="item">0</li>
      <li class="item">1</li>
      <li class="item">2</li>
      <li class="item">3</li>
      <li class="item">4</li>
    </ul>
    <script>
      //1. 将所有的li.item 变成红色
      console.dir(document);
      //querySelectorAll(selector):返回一组元素
      console.dir(document.querySelectorAll('.item'));
      const items = document.querySelectorAll('.item');
      for (let i = 0; i < items.length; i++) {
        //console.log(items[i]);
        items[i].style.color = 'red';
      }
      //2. 将第一个改为蓝色
      //querySelector: 返回一组元素中的第一个，只返回一个，而不是一组
      const firstItem = document.querySelector('.item');
      firstItem.style.color = 'blue';
      console.log(document.querySelector('body'));
      console.log(document.body);
      console.log(document.head);
      console.log(document.title);
      //获取html
      console.log(document.documentElement);
    </script>
  </body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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访问器属性

效果图：

代码

获取DOM元素

效果图

代码