Vue 基于类的组件警告:属性未在实例上定义，但在渲染期间引用

2022-01-25 00:00:00 vue.js vue-component typescript vuejs2 vue-class-components

我正在尝试使用 vue-class-component 和 typescript 创建一个 vue 组件(在此处找到 https://github.com/vuejs/vue-class-component).据我了解，数据是在类中定义的，如下所示 - 但我收到错误:

I am trying to create a vue component with vue-class-component and typescript (found here https://github.com/vuejs/vue-class-component). From what I understand, data is defined in the class, as I have done below - yet I receive the error: 

"[Vue warn]: Property or method "test" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property."

这是我实际代码的精简版，但它仍然不起作用:

Here is a stripped down version of my actual code, but it still doesn't work:

<template>

  <div id="vue-test">
    <input v-model="test"/>
    {{test}}
  </div>

</template>

<script lang="ts">
import Vue from 'vue';
import Component from 'vue-class-component';

@Component({
})
export default class AppearanceDialogVue extends Vue {
  public test: string = '100';
}

</script>

似乎将测试"的声明更改为

It appears that changing 'test's declaration to 

public test: string;

工作

推荐答案

这里是解决这个问题的方法，需要添加一个构造函数，并在构造函数中初始化属性

Here is the solution to this issue, need to add a constructor and initialize the property in the constructor

<template>
<section class="dropdown" style="background-color: #dde0e3">
  <select class="btnList" v-model="foo">
    <option v-for="item in selectedfooData" :value="item" :key="item.id">{{item}}</option>
    </select>
    {{foo}}
  </section>
</template>

<script lang="ts">
  import { Component, Prop, Vue } from 'vue-property-decorator';
  @Component
  export default class HelloWorld extends Vue {  
  private foo: string;
  private selectedfooData : string[] = [
   'one',
   'two'
  ]
  construtor() { 
    super();
    this.foo = '';
  }

 }
</script>

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