Super expression must either be null or a function, not undefined

最近在看react……,然后出现这个错误,

class Clocks extends ReactDOM.Component{
          constructor(props){
              super(props);
              this.state ={date:new Date()};
          }
          render(){
              return(
                  

Hello world

{this.state.date.toLocaleTimeString()}

); } }

百度看到有位大佬(https://www.cnblogs.com/mianbaodaxia/p/6170726.html)说是Component写错成Compotent,但是自己的并不是这个错误,深受启发,仔细观察才发现是把

class Clocks extends React.Component

写错成

class Clocks extends ReactDOM.Component

emmm……面壁思过去

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