React 元素的 onScroll 不生效

1. 问题

页面中存在多个元素（存在父子关系）监听onScroll时，可能子元素的不生效

2. 解决

The root of the problem is that this.refs.list is a React component, not a DOM node. To get the DOM element, which has the addEventListener() method, you need to call

class ScrollingApp extends React.Component {

    _handleScroll(ev) {
        console.log("Scrolling!");
    }
    componentDidMount() {
        const list = ReactDOM.findDOMNode(this.refs.list)
        list.addEventListener('scroll', this._handleScroll);
    }
    componentWillUnmount() {
        const list = ReactDOM.findDOMNode(this.refs.list)
        list.removeEventListener('scroll', this._handleScroll);
    }
    /* .... */
}

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