antdesign里modal关于React16.8新加hook属性

React16.8新加hook属性，在function中可用，class里需自行转换旧语法。。。

constructor(props) {
    super(props);
    this.state = {
        isModalVisible: false
    }
}
-----------------------------

// const [isModalVisible, setIsModalVisible] = useState(false);
-----------------------------
 const  isModalVisible  = this.state.isModalVisible;

 const showModal = () => {
        this.setState({
            isModalVisible:true
        })
    };

    const handleOk = () => {
        this.setState({
            isModalVisible:false
        })
    };

参考reactjs.org/docs/hooks-…