this.props.children undefined

你没办法通过 this.props.children 取得当前组件的子元素。 因为this.props.children 返回的是组件拥有者传递给你的 passed onto you 子节点。var App = React.createClass({ componentDidMount: function() { // This doesn't refer to the `span`s! It refers to the children between // last line's `<App></App>`, which are undefined.