直接给onChange事件绑定一个箭头函数，这个箭头函数的参数就是event，在箭头函数内再调用saveFormData方法，saveFormData方法里面this.setState({ [dataType]: value })
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>数据双向绑定不用柯里化的实现</title>
</head>
<body>
<div id="test"></div>
<script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
<script src="https://cdn.staticfile.org/prop-types/15.6.1/prop-types.js"></script>
<script type="text/babel">
class Demo extends React.Component {
state = {
username: '',
password: ''
}
handleSubmit = (event) => {
event.preventDefault()
}
saveFormData = (dataType, value) => {
this.setState = {
[dataType]: value
}
console.log(dataType, value)
}
render() {
return (
<form onSubmit={ this.handleSubmit }>
用户名：<input type="text" name="username" onChange={ event => this.saveFormData('username', event.target.value) } />
密码：<input type="paasword" name="paasword" onChange={ event => this.saveFormData('paasword', event.target.value) } />
<button>登录</button>
</form>
)
}
}
ReactDOM.render(<Demo />, document.getElementById('test'))
</script>
</body>
</html>
