从父组件和当前组件中获取参数

// 父组件A
import React from 'react';
import ChildComponent from './ChildComponent';

class ParentComponent extends React.Component {
  render() {
    const parameter = 'Hello from parent component';
    return (
      <ChildComponent parameter={parameter} />
    );
  }
}

// 子组件B
import React from 'react';

class ChildComponent extends React.Component {
  render() {
    const { parameter } = this.props;
    return (
      <div>{parameter}</div>
    );
  }
}

<!-- 父组件A -->
<template>
  <div>
    <child-component :parameter="parameter"></child-component>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      parameter: 'Hello from parent component'
    };
  }
}
</script>

<!-- 子组件B -->
<template>
  <div>{{ parameter }}</div>
</template>

<script>
export default {
  props: {
    parameter: {
      type: String,
      required: true
    }
  }
}
</script>

// 父组件A
import { Component } from '@angular/core';

@Component({
  selector: 'app-parent-component',
  template: `
    <app-child-component [parameter]="parameter"></app-child-component>
  `
})
export class ParentComponent {
  parameter = 'Hello from parent component';
}

// 子组件B
import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-child-component',
  template: `
    <div>{{ parameter }}</div>
  `
})
export class ChildComponent {
  @Input() parameter: string;
}