我能够在TypeScript中执行以下操作
class Foo {
private constructor () {}
}
因此只能从类本身内部访问此constructor。
如何在Dart中实现相同的功能？
答案 0 :(得分：5)
只需创建一个以import React, { Component } from "react";
import ReactDOM from "react-dom";
import { Dropdown, Form } from "semantic-ui-react";
const trigger = (
<span style={{ marginTop: "2px" }}>
<i aria-hidden="true" class="user big icon" size="big" />
</span>
);
const options = [
{ key: "user", text: "Account", icon: "user", value: "/accounts" },
{ key: "settings", text: "Settings", icon: "settings", value: "/settings" },
{ key: "sign-out", text: "Sign Out", icon: "sign out", value: "/sign-out" }
];
class App extends Component {
move = (e, { value }) => {
this.props.history.push('value')
}
render() {
return (
<div>
<Dropdown
options={options}
trigger={trigger}
icon={null}
onChange={this.move}
/>
</div>
);
}
}
开头的命名构造函数
_然后只能从其类（和库）访问构造函数class Foo {
Foo._() {}
}
。
答案 1 :(得分：2)
没有任何代码的方法必须是这样的
class Foo {
Foo._();
}