...... 
 this.state = {
   //初始化空数组，表示已经选择的
   selectedStores:[],
  }

......

handleClick(e){

 const newSelection = e.target.value;//拿到点击的具体一项

 let newSelectionArray;//新建一个空数组

//判断点击项是否为选择状态，是的话清除选中状态

 if(this.state.selectedStores.indexOf(newSelection) > -1) {

  newSelectionArray =

  this.state.selectedStores.filter((s:any) => s !== newSelection)

} else {

//不是的话就加入新选择数组

  newSelectionArray =

  [...this.state.selectedStores, newSelection];

}

 this.setState({
// 新选择数组统一改为选中状态
  selectedStores: newSelectionArray

 });

}

arr.indexOf(searchElement)
arr.indexOf(searchElement[, fromIndex = 0])

var new_array = arr.filter(callback[, thisArg])