(一)需要
最近在学习 React,学到了 React 事件传参的形式,就记录一下。
(二)介绍
1、bind 的模式传参
bind 模式 参数在前
clickBtn = (params, event) => {console.log('[ event] >', params, event)
this.setState({sum: params + 1})
}
<Button onClick={this.clickBtn.bind(this, this.state.sum)} type="primary"> 点击 +1</Button>
2、箭头函数的模式传参
箭头函数 参数在后
clickBtnCount = (event, params) => {console.log('[ clickBtnCount] >', event, params)
this.setState({count: params + 2})
}
<Button onClick={(e) => this.clickBtnCount(e, this.state.count)} type="primary"> 点击 +2</Button>
(三)实现 Demo
/*
* @Author: ArdenZhao
* @Date: 2022-04-13 15:48:04
* @LastEditTime: 2022-04-13 16:23:15
* @FilePath: /react-ts/src/components/react/6-enent-this.js
* @Description: file information
*/
import React from 'react';
import "antd/dist/antd.css";
import {Button} from 'antd';
class SubComponent extends React.Component {
// 挂载阶段
constructor(props) {super(props);
this.state = {
name: 'Arden',
sum: 1,
count: 0,
}
}
// bind 的模式,第一个参数是参数值,第二个参数是 event
clickBtn = (params, event) => {console.log('[ event] >', params, event)
this.setState({sum: params + 1})
}
clickBtnCount = (event, params) => {console.log('[ clickBtnCount] >', event, params)
this.setState({count: params + 2})
}
render() {
return (
<>
<h2> 事件传参 </h2>
<p>1、bind 的模式传参_计数器:{this.state.sum}</p>
<Button onClick={this.clickBtn.bind(this, this.state.sum)} type="primary"> 点击 +1</Button>
<br></br>
<p>2、箭头函数的模式传参_计数器:{this.state.count}</p>
<Button onClick={(e) => this.clickBtnCount(e, this.state.count)} type="primary"> 点击 +2</Button>
</>
)
}
}
function ReactParams(props) {
return (
<div>
<h1>Learn, {props.name}</h1>
<form>
<SubComponent />
</form>
</div>
);
}
export default ReactParams
写在最初的话
学习路上,经常会懈怠。
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