在反应组件中将箭头函数转换为 "ordinary" 函数表达式

Question

我想把这个react组件中的箭头样式函数(at onChange)改成普通函数。我是初学者，对我来说并排查看两个版本很有帮助，因为我很难掌握新的箭头函数语法。

这应该是可能的，但是使用 "ordinary" 函数，下面的 could 看起来如何？

import React from "react";

function Input1(props) {
  //console.log(props)
  return (
    <div>
      <input
        onChange={event => props.handleChange("email", event.target.value)}
      />
    </div>
  );
}

export default Input1;

Answer 1

 <div>
  <input
    onChange={function(event) {
          props.handleChange("email", event.target.value)
         }
   }
  />
</div>

Answer 2

import React from "react";

function Input1(props) {
  //console.log(props)

  function onChange(event) {
    props.handleChange("email", event.target.value)
  }

  return (
    <div>
      <input
        onChange={onChange}
      />
    </div>
  );
}

export default Input1;

Answer 3

import React from "react";

function Input1(props) {

  function changeHandler(event) {
     props.handleChange("email", event.target.value)
  }

  //console.log(props)
  return (
    <div>
      <input
        onChange={changeHandler}
      />
    </div>
  );
}

export default Input1;

Answer 4

import React from "react";

class Input1 extends React.Component {
 constructor(props) {
    super(props);
    //need to bind in case of using function decleration
    this.handleChange = this.handleChange.bind(this);
  }

 handleChange(event){
   props.handleChange("email", event.target.value);
  }

 render() {
   return (
    <div>
      <input
        onChange={this.handleChange}
      />
    </div>
   )
 }

}

在反应组件中将箭头函数转换为 "ordinary" 函数表达式

Arrow function into "ordinary" function expression in react component

javascript

reactjs

arrow-functions

react-component