强制Vue重新渲染组件的5种方法小结

<template>
  <div>
    <button @click="forceRerender">重新渲染</button>
    <ChildComponent :key="key"></ChildComponent>
  </div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';
export default {
  data() {
    return {
      key: 0
    };
  },
  methods: {
    forceRerender() {
      this.key += 1;
    }
  },
  components: {
    ChildComponent
  }
};
</script>

<template>
  <div>
    <button @click="toggle">重新渲染</button>
    <ChildComponent v-if="shouldRender"></ChildComponent>
  </div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';
export default {
  data() {
    return {
      shouldRender: true
    };
  },
  methods: {
    toggle() {
      this.shouldRender = false;
      this.$nextTick(() => {
        this.shouldRender = true;
      });
    }
  },
  components: {
    ChildComponent
  }
};
</script>

<template>
  <div>
    <button @click="forceUpdate">重新渲染</button>
    <ChildComponent></ChildComponent>
  </div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';
export default {
  methods: {
    forceUpdate() {
      this.$forceUpdate();
    }
  },
  components: {
    ChildComponent
  }
};
</script>

<template>
  <div>
    <button @click="updateData">重新渲染</button>
    <p>{{ message }}</p>
  </div>
</template>
<script>
export default {
  data() {
    return {
      message: 'Hello, Vue!'
    };
  },
  methods: {
    updateData() {
      this.message = 'Hello, Vue! ' + new Date().toLocaleTimeString();
    }
  }
};
</script>

<!-- ParentComponent.vue -->
<template>
  <div>
    <ChildComponent @update="handleUpdate"></ChildComponent>
  </div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';
export default {
  methods: {
    handleUpdate() {
      // 强制重新渲染
      this.$forceUpdate();
    }
  },
  components: {
    ChildComponent
  }
};
</script>
<!-- ChildComponent.vue -->
<template>
  <div>
    <button @click="$emit('update')">更新父组件</button>
  </div>
</template>
<script>
export default {};
</script>