React setState更新数组中的某个元素Element item

var items = this.state.items;
items[i].status = 'doing';
this.setState({
      items: items
});

//this.state.useLists[index].status === '10'?
　　let items = this.state.useLists;
　　items[index] === '10' ? items[index] = '20' : items[index] = '10';
　　this.setState({
　　useLists:items
});