react使用setSetat设置多级对象的值

对象为多级对象，不修改数组元素

this.state = {
    exportData: {
        exportCondition: {
            selfDefine: {
                checked: false,
                value: ''
            }
        }
    }
};


修改checked属性值方法：
this.setState({
     exportData: {
          ...this.state.exportData,
          exportCondition: {
              ...this.state.exportData.exportCondition,
              selfDefine: {
                  ...this.state.exportData.exportCondition.selfDefine,
                  checked: value
              }
          }
      }
});