Vuejs - 使用道具将数据从父级传递给子级 [英] Vuejs - pass data from parent to child with props

问题描述

我已经开始使用 Vue，但在尝试使用 props 将数据传递给组件时遇到了问题.在下面的代码中 this.myData(在 Hello.vue 中)由于某种原因是 undefined

I have started playing with Vue but faced an issue when trying to pass data to a component using props. In the code below this.myData (in the Hello.vue) is undefined for some reason

App.vue

<script>
import Hello from './components/Hello'

export default {
  name: 'app',
  data() {
    return {
      myData: 'this is my data'
    }
  },
  components: {
    Hello
  } ...
 </script>

Hello.vue

<script>
export default {
  name: 'hello',
  props: ['myData'],
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
  mounted: function() {
       console.log(this.myData)
   }
} ...
</script>

推荐答案

需要在父类中使用子组件，所以:

You need to use the child component in the parent like, so:

// inside app.vue
<template>
  <hello :myData='myData'></hello> // I believe this is your objective
</template> //:myData is binding the property from the components data field, without using it, you will get myData as `string` in the child component.

<script>
  export default {
  name: 'app',
  data() {
    return {
      myData: 'this is my data'
    }
  },
  components: {
    Hello
  }
</script>

OP 请求了一种将 props 传递给子级而不在模板中渲染子级的方法.

OP requested a way to pass in props to a child without rendering the child in the template.

所以我发布了一个链接到文档

So I am posting a link to the documentation

Vue.component('hello', {
  render: function (createElement) {
    return createElement(
      <tag-names>
    )
  },
  props: {
    myData: parentComponent.myData // you need to give the parent components' data here.
  }
})

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