A component is changing an uncontrolled input of type number to be controlle react报错

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react 报错

A component is changing an uncontrolled input of type number to be controlle

input 的值如果不存在，请设置成 ‘’ ,

 <input type="number" placeholder="请输入申请金额" value={ this.state.askMoney?this.state.askMoney:'' } onChange={ ev=>this.changeAskMoney(ev) } />