React createRef循环动态赋值ref问题

handleChange = (key) => {
    this[`input${key}Ref`] = React.createRef();
}
 
handleSave = () => {
    const { list } = this.state;
    for (let item of list) {
        if (item.value && item.value.length > 100) {
          Toast.show(`${item.name}不能超过100个字符`);
          this[`input${item.key}Ref`].current&&this[`input${item.key}Ref`].current.focus();
          return;
        }
    }
    // 写接口等其他逻辑
 }
 
render() {
    const { list } = this.state;
    <div>
        {
            list.map(item=>{
              <Input
                  ref={this[`input${item.key}Ref`]}
                  value={item.value}
                  onChange={() => { this.handleChange(item.key) }}
              />
            })
        }
        <Button type="primary" onClick={this.handleSave}>保存</Button>
     </div>
}

<input ref="inputRef" /> //this.refs['inputRef']来访问

<input ref={(input) => {this.textInput = input;}} type="text" />   //HTML 元素添加 ref 属性时

<CustomInput ref={(input) => {this.textInput = input;}} />   //组件添加 ref 属性

class Child extends React.Component{
    constructor(props){
        super(props);
        this.myRef=React.createRef();
    }
    componentDidMount(){
        console.log(this.myRef.current);
    }
    render(){
        return <input ref={this.myRef}/>
    }
}

var Parent = React.createClass({
  render: function(){
    return (
      <div className = 'parent'>
        <Child ref = 'child'/>
      </div>
    )
  },
  componentDidMount(){
    console.log(this.refs.child); // 访问挂载在组件上ref
    console.log(ReactDOM.findDOMNode(this.refs.child)); // 访问真正的dom节点
  }
})

var Child = React.createClass({
  render: function() {
    return (
        <div ref="test">
          <a ref="update">更新</a>
        </div>
    );
  }
});

handleShowModalAdd = () => {
    this.add.handleToggle()//handleToggle为子组件中的方法
}

<SystemAdd ref={(el) => this.add = el}/>

handleShowModalAdd = () => {
    this.add.handleToggle()//handleToggle为子组件中的方法
}

<SystemAdd onRef={(ref) => this.add = ref }/>

componentDidMount(){
    this.props.onRef(this)//将组件实例this传递给onRef方法
}