What are the ways to customize instructions in vue

Methods to customize Vue instructions include: 1. Global instructions, registered through Vue.directive(); 2. Local instructions, using v-directive instruction syntax in templates; 3. Intra-component instructions, in components registered in the directives option. Each instruction has hook functions such as bind, inserted, update, componentUpdated, and unbind, which are used to execute code during the different life cycles of the instruction.

Methods of custom instructions in Vue

In Vue, you can extend the functions of Vue through custom instructions , to achieve more flexible and reusable code. Here are several ways to create custom directives:

1. Global directive

<code class="js">Vue.directive('my-directive', {
  bind(el, binding, vnode) {
    // 指令绑定时执行
  },
  inserted(el, binding, vnode) {
    // 指令首次插入 DOM 时执行
  },
  update(el, binding, vnode, oldVnode) {
    // 指令每次更新时执行
  },
  componentUpdated(el, binding, vnode, oldVnode) {
    // 指令所在组件更新后执行
  },
  unbind(el, binding, vnode) {
    // 指令和对应元素解绑时执行
  },
});</code>

2. Local directive

<code class="js"><template>
  <div v-my-directive></div>
</template>

<script>
export default {
  directives: {
    myDirective: {
      bind(el, binding, vnode) {
        // 指令绑定时执行
      },
      // ...其他指令钩子函数
    }
  }
};
</script></code>

3. In-component instructions

<code class="js"><template>
  <template v-my-directive></template>
</template>

<script>
export default {
  directives: {
    myDirective: {
      bind(el, binding, vnode) {
        // 指令绑定时执行
      },
      // ...其他指令钩子函数
    }
  },
  components: {
    // ...其他组件注册
    MyComponent: {
      directives: {
        myDirective: {
          bind(el, binding, vnode) {
            // 指令绑定时执行
          },
          // ...其他指令钩子函数
        }
      }
    }
  }
};
</script></code>

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