522 vue父子组件的访问方式: $children、$refs、$parent

父子组件的访问方式: $children、$refs

父子组件的访问方式: $children


父子组件的访问方式: $refs


组件访问-父访问子-children-refs.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>

<body>

  <div id="app">
    <cpn></cpn>
    <cpn></cpn>

    <my-cpn></my-cpn>
    <y-cpn></y-cpn>

    <cpn ref="aaa"></cpn>
    <button @click="btnClick">按钮</button>
  </div>

  <template id="cpn">
    <div>我是子组件</div>
  </template>
  <script src="../js/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        message: '你好啊'
      },
      methods: {
        btnClick() {
          // 1.$children
          // console.log(this.$children);
          // for (let c of this.$children) {
          //   console.log(c.name);
          //   c.showMessage();
          // }
          // console.log(this.$children[3].name);

          // 2.$refs => 对象类型, 默认是一个空的对象,ref='bbb' 【以对象结构保存所有子组件】
          console.log(this.$refs.aaa.name);
        }
      },
      components: {
        cpn: {
          template: '#cpn',
          data() {
            return {
              name: '我是子组件的name'
            }
          },
          methods: {
            showMessage() {
              console.log('showMessage');
            }
          }
        },
      }
    })
  </script>

</body>

</html>

父子组件的访问方式: $parent

组件访问-子访问父-parent-root

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>

<body>

  <div id="app">
    <cpn></cpn>
  </div>

  <template id="cpn">
    <div>
      <h2>我是cpn组件</h2>
      <ccpn></ccpn>
    </div>
  </template>

  <template id="ccpn">
    <div>
      <h2>我是子组件</h2>
      <button @click="btnClick">按钮</button>
    </div>
  </template>

  <script src="../js/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        message: '你好啊'
      },
      components: {
        cpn: {
          template: '#cpn',
          data() {
            return {
              name: '我是cpn组件的name'
            }
          },
          components: {
            ccpn: {
              template: '#ccpn',
              methods: {
                btnClick() {
                  // 1.访问父组件$parent
                  // console.log(this.$parent);
                  // console.log(this.$parent.name);

                  // 2.访问根组件$root
                  console.log(this.$root);
                  console.log(this.$root.message);
                }
              }
            }
          }
        }
      }
    })
  </script>

</body>

</html>

posted on 2020-08-22 19:57  冲啊!  阅读(213)  评论(0编辑  收藏  举报

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