方法一:最麻烦的写法,不推荐

import React from 'react';
class App extends React.Component {
handleClick() {
alert('点击')
}
render() {
return (
<div>
<button onClick={this.handleClick.bind(this)}>click</button>
</div>
)
}
}
export default App;

方法二:在构造函数里统一绑定,不常用。

import React from 'react';
class App extends React.Component {
constructor(props) {
super(props);
this.handleClick = this.handleClick.bind(this)
}
handleClick() {
alert('点击')
}
render() {
return (
<div>
<button onClick={this.handleClick}>click</button>
</div>
)
}
}
export default App;

方法三:最常见的写法。

import React from 'react';
class App extends React.Component {
constructor(props) {
super(props);
}
handleClick = () => {
alert('点击')
}
render() {
return (
<div>
<button onClick={this.handleClick}>click</button>
</div>
)
}
}
export default App;

方法四:可以传参数。

import React from 'react';
class App extends React.Component {
constructor(props) {
super(props);
}
handleClick (e) {
alert(e)
}
render() {
return (
<div>
<button onClick={(e) => this.handleClick(e)}>click</button>
</div>
)
}
}
export default App;
05-18 04:35