您可以使用React.Children遍历子级，然后使用React.cloneElement使用新的道具（浅合并）克隆每个元素，例如：
const Child = ({ doSomething, value }) => (
<div onClick={() => doSomething(value)}>Click Me</div>
);
class Parent extends React.PureComponent {
doSomething = value => {
console.log('doSomething called by child with value:', value);
}
render() {
const childrenWithProps = React.Children.map(this.props.children, child =>
React.cloneElement(child, { doSomething: this.doSomething })
);
return <div>{childrenWithProps}</div>
}
};
ReactDOM.render(
<Parent>
<Child value="1" />
<Child value="2" />
</Parent>,
document.getElementById('container')
);
您也可以将道具传递给带有渲染道具的孩子。在这种方法中，子代（可以是children或任何其他prop名称）是一个函数，可以接受您要传递的任何参数并返回子代：
const Child = ({ doSomething, value }) => (
<div onClick={() => doSomething(value)}>Click Me</div>
);
class Parent extends React.PureComponent {
doSomething = value => {
console.log('doSomething called by child with value:', value);
}
render() {
// Note that children is called as a function and we can pass args to it
return <div>{this.props.children(this.doSomething)}</div>
}
};
ReactDOM.render(
<Parent>
{doSomething => (
<React.Fragment>
<Child doSomething={doSomething} value="1" />
<Child doSomething={doSomething} value="2" />
</React.Fragment>
)}
</Parent>,
document.getElementById('container')
);
如果您愿意，也可以代替<React.Fragment>或简单地<>返回一个数组。
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