详解react关于事件绑定this的四种方式

<a href="#" onclick="console.log('The link was clicked.'); return false">
Click me
</a>

class ActionLink extends React.Component {
constructor(props) {
super(props);
}

handleClick(e) {
e.preventDefault();
console.log('The link was clicked.');
}

render() {
return (
<a href="#" onClick={this.handleClick.bind(this)}>Click Me...</a>
);
}

}

class Home extends React.Component {

 constructor(props) {
  super(props);
  this.state = {
  };
 }

 del(){
  console.log('del')
 }

 render() {
  return (
   <div className="home">
    <span onClick={this.del.bind(this)}></span>
   </div>
  );
 }
}

class Home extends React.Component {

 constructor(props) {
  super(props);
  this.state = {

  };
  this.del=this.del.bind(this)
 }

 del(){
  console.log('del')
 }

 render() {
  return (
   <div className="home">
    <span onClick={this.del}></span>
   </div>
  );
 }
}

class Home extends React.Component {

 constructor(props) {
  super(props);
  this.state = {

  };
 }

 del(){
  console.log('del')
 }

 render() {
  return (
   <div className="home">
    <span onClick={::this.del}></span>
   </div>
  );
 }
}

class Home extends React.Component {

 constructor(props) {
  super(props);
  this.state = {

  };

 }

 del=()=>{
  console.log('del')
 }

 render() {
  return (
   <div className="home">
    <span onClick={this.del}></span>
   </div>
  );
 }
}