react中事件绑定的三种方式

JavaScript
  • 在执行事件上bind
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import React, { Component } from 'react';

class Progress extends Component {
  handleClick() {
    console.log('this: %o', this.handleClick)
  }

  render() {
    return (
      <div className="center">
        <button onClick={this.handleClick.bind(this)}>按钮</button>
      </div>
    );
  }
}

export default Progress;
  • 在构造器内声明
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import React, { Component } from 'react';

class Progress extends Component {
  constructor(props) {
    super(props);
    this.state = {}

    this.handleClick = this.handleClick.bind(this)
  }

  handleClick() {
    console.log('this: %o', this.handleClick)
  }

  render() {
    return (
      <div className="center">
        <button onClick={this.handleClick}>按钮</button>
      </div>
    );
  }
}

export default Progress;
  • 使用箭头函数
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import React, { Component } from 'react';

class Progress extends Component {
  handleClick = () => {
    console.log('this: %o', this.handleClick)
  }

  render() {
    return (
      <div className="center">
        <Button onClick={this.handleClick}>按钮</Button>
      </div>
    );
  }
}

export default Progress;