form-React中的多个输入元素

有人能告诉我这个密码有什么问题吗? onSubmit在只有一个输入元素时工作,但在有多个输入元素时不工作!

    class ReactForm extends React.Component{

    constructor(props){
    super(props);
    this.handleChange=this.handleChange.bind(this);
    this.validate=this.validate.bind(this);

     this.state={
      name:'',
      email:''
     };
   }

  handleChange(event){
event.preventDefault();
 const name = event.target.name;
 const value = event.target.value;
 this.setState({

   [name]:value

    });

 }

 validate(event){
   event.preventDefault();
   console.log(this.state);

  }

render(){

return (

  <div>
   <form onSubmit={this.validate}>
  <div>
     <input type="text" name="name" value={this.state.name} onChange={this.handleChange}/>
     <input type="email" name="email" value={this.state.email} onChange={this.handleChange}/>
  </div>


</form>
</div>
);

}


   }



 ReactDOM.render(

    <ReactForm />,

document.getElementById("root")

    )