一、React

(一)父組件向子組件傳數據

1. 簡單的向下傳遞參數

/* Parent */
class App extends Component {
  render() {
    return (
      <div className="App">
        <Child msg="來自父元素的問候"/>
      </div>
    );
  }
}

/* Child */
class Child extends Component {
  render() {
    return <div>{this.props.msg}</div>;
  }
}
 

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1. 向更下一級傳遞參數

/* Child1 */
class Child1 extends Component {
  render() {
    return (
      <div>
        <h3>Child1</h3>
        <p>{this.props.msg}</p>
        <Child1_Child1 {...this.props} />
      </div>
    );
  }
}

/* Child1_Child1 */
class Child1_Child1 extends Component {
  render() {
    return (
      <div>
        <h3>Child1_Child1</h3>
        <p>{this.props.msg}</p>
      </div>
    );
  }
}
 

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(二)子組件向父組件傳遞參數

/* Parent */
class App extends Component {
  constructor() {
    super();
    this.state = {
      msg: "this is parent msg"
    };
  }

  changeMsg(msg) {
    this.setState({ msg });
  }

  render() {
    return (
      <div className="App">
        <h3>parent</h3>
        <p>{this.state.msg}</p>
        <Child1
          changeMsg={msg => {
            this.changeMsg(msg);
          }}
          msg={this.state.msg}
        />
      </div>
    );
  }
}

/* Child1 */
class Child1 extends Component {
  componentDidMount() {
    setTimeout(() => {
      this.props.changeMsg("This child change msg");
    }, 1000);
  }

  render() {
    return (
      <div>
        <h3>Child1</h3>
        <p>{this.props.msg}</p>
      </div>
    );
  }
}
 

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(三)兄弟組件傳遞參數

/* Parent */
class App extends Component {
  constructor() {
    super();
    this.state = {
      msg: "this is parent msg"
    };
  }

  changeMsg(msg) {
    this.setState({ msg });
  }

  render() {
    return (
      <div className="App">
        <h3>parent</h3>
        <p>{this.state.msg}</p>
        <Child1
          changeMsg={msg => {
            this.changeMsg(msg);
          }}
          msg={this.state.msg}
        />
        <Child1
          msg={this.state.msg}
        />
      </div>
    );
  }
}

/* Child1 */
class Child1 extends Component {
  componentDidMount() {
    setTimeout(() => {
      this.props.changeMsg("This child change msg");
    }, 1000);
  }

  render() {
    return (
      <div>
        <h3>Child1</h3>
        <p>{this.props.msg}</p>
      </div>
    );
  }
}

/* Child2 */
class Child2 extends Component {
  render() {
    return (
      <div>
        <h3>Child2</h3>
        <p>{this.props.msg}</p>
      </div>
    );
  }
}

二、Vue

(一)父組件向子組件傳數據

1. 簡單的向下傳遞參數

```/* Parent */
<div id="app">
<Child msg=‘ni daye‘/>
</div>

/* Child1 */
<template>
<div class="hello">
<p>{{ msg }}</p>
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
msg: String
}
// somecomde
};
</script>
```

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1. 向更下一級傳遞參數

```/* Child1 */
<template>
<div class="hello">
<p>{{ msg }}</p>
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
msg: String
}
// some code
};
</script>

/* Child1Child1 */
<template>
<div class="hello">
<p>{{ msg }}123123</p>
</div>
</template>
<script>
export default {
name: "Child1Child1",
props: {
msg: String
}
// some code
};
</script>
```

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(二)子組件向父組件傳遞參數

```/* Parent */
<template>
<div id="app">
<h3>parent</h3>
<Child2 @changParent=‘dealFromChild2‘/>
</div>
</template>
<script>
import Child2 from "./components/Child2";

export default {
name: "App",
components: {
Child2
},
data () {
return {
fromChild2: ‘‘
}
},
methods: {
dealFromChild2 (val) {
this.fromChild2 = val;
}
}
};
</script>

/* Child2 */
<script>
export default {
name: "Child2",
data() {
return {};
},
mounted () {
setTimeout(() =>{
this.$emit(‘changParent‘, ‘come from Child2‘)
}, 1000)
}
};
</script>
```

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(三)兄弟組件傳遞參數

```/* Parent */
<template>
<div id="app">
<h3>parent</h3>
<Child2 @changParent=‘dealFromChild2‘/>
<Child1 :fromChild2=‘fromChild2‘>
</div>
</template>
<script>
import Child2 from "./components/Child2";
import Child1 from "./components/Child1";

export default {
name: "App",
components: {
Child2
},
data () {
return {
fromChild2: ‘‘
}
},
methods: {
dealFromChild2 (val) {
this.fromChild2 = val;
}
}
};
</script>

/* Child2 */
<script>
export default {
name: "Child2",
data() {
return {};
},
mounted () {
setTimeout(() =>{
this.$emit(‘changParent‘, ‘come from Child2‘)
}, 1000)
}
};
</script>

/* Child1 */
<template>
<div class="hello">
<p>{{ fromChild2 }}</p>
</div>
</template>
export default {
name: "HelloWorld",
props: {
fromChild2: String
}
// some code
};
```

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在github上編輯此頁

來源：https://segmentfault.com/a/1190000016784633

React和Vue組件間數據傳遞demo