反应： Map Function 内的儿童道具

Question

Parent component initialized like so:

class Parent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      children: [
        {name: "Julien Lennon"},
        {name: "Sean Lennon"}
      ]
    }
  }
  render() {
    return <div class="parent">Parent, called {this.props.name}
        {this.state.children.map((child, index) => {
          return (
            <Child name="{child.name}" />
          );
        })}
    </div>;
  }
}

Now, in the child I just want to access the name prop:

class Child extends React.Component {
  render() {
    return <div class="child">Child named {this.props.name}</div>;
  }
}

But its outputing the name as a literal: Child named {child.name}

fiddle: https://jsfiddle.net/89k1zcdp/6/

Answer 1

Do this rather

<Child name={child.name} />

Answer 2

You just need to remove the quotes around {child.name} in your Parent component's render function. Like this:

<Child name={child.name} />

Explanation: In React, the HTML-like code is actually React's own templating language called JSX. In JSX, you can indicate that a section of code is meant to be interpreted as JavaScript by wrapping it in brackets: {}. But since "{child.name}" is wrapped in those double quotes it turns the brackets and everything they contain into a string. Removing the quotes like so {child.name} will reference the name property of the child object like you would expect JS to do.