react创建的组件中bind的使用
发布时间:2020-12-15 07:37:12 所属栏目:百科 来源:网络整理
导读:export class Counter extends React.Component { constructor(props) { super(props); this.state = {count: props.initialCount}; this.tick = this.tick.bind(this); } tick() { this.setState({count: this.state.count + 1}); } render() { return ( di
export class Counter extends React.Component { constructor(props) { super(props); this.state = {count: props.initialCount}; this.tick = this.tick.bind(this); } tick() { this.setState({count: this.state.count + 1}); } render() { return ( <div onClick={this.tick}> Clicks: {this.state.count} </div> ); } } Counter.propTypes = { initialCount: React.PropTypes.number }; Counter.defaultProps = { initialCount: 0 }; Methods follow the same semantics as regular ES6 classes,meaning that they don't automatically bind this to the instance. You'll have to explicitly use // You can use bind() to preserve `this` <div onClick={this.tick.bind(this)}> // Or you can use arrow functions <div onClick={() => this.tick()}> 这是react官网上面的例子,也就是说,如果我们使用了es6(这里应该指的是使用的时候采用es6,而不是定义的时候采用es6)的 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |