更改<button type="button"为<button type="submit"。删除onClick。反而做<form className="commentForm" onSubmit={this.onFormSubmit}>。这应该可以单击按钮并按回车键。
onFormSubmit = e => {
e.preventDefault();
const { name, email } = this.state;
// send to server with e.g. `window.fetch`
}
...
<form onSubmit={this.onFormSubmit}>
...
<button type="submit">Submit</button>
</form>
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