微信小程序开发之改变data中数组或对象的某一属

<scroll-view class='hd-cont' scroll-x="true" style='width: 100%'>
 <view wx:for="{{sDate}}" wx:key="{{index}}" class='date-cont'>
  <view>{{item.week}}</view>
  <view bindtap='select' data-index="{{index}}" class=' curl {{item.selected}}'>{{item.date}}</view>
 </view>
</scroll-view>　

.hd-cont {
 height: 126rpx;
 white-space: nowrap;
 padding-left: 20rpx;
 color: #fff;
 font-size: 28rpx;
 box-sizing: border-box;
}
.date-cont {
 width: 40rpx;
 margin-right: 70rpx;
 height: 100%;
 display: inline-block;
 padding-: 10rpx;
 box-sizing: border-box;
 text-align: center;
}
.curl {
 width: 40rpx;
 height: 40rpx;
 border-radius: 50%;
 line-height: 40rpx;
}
.date-cont view:first-child {
 margin-bottom: 20rpx;
}
.focus {
 display: inline-block;
 width: 40rpx;
 height: 40rpx;
  font-family: Monaco;">#fff;
 color: #1680;
 border-radius: 50%;
 line-height: 40rpx;
}

Page({
data: {
 sDate: [
  { "week": "日", "date": "01" ,"selected": "focus" },
  { "week": "一", "date": "02", "selected": " " },
  { "week": "二", "date": "03", "selected": " " },
  { "week": "三", "date": "04", "selected": " " },
  { "week": "四", "date": "05", "selected": " " },
  { "week": "五", "date": "06", "selected": " " },
  { "week": "六", "date": "07", "selected": " " },
  { "week": "日", "date": "08", "selected": " " },
  { "week": "一", "date": "09", "selected": " " },
  { "week": "二", "date": "10", "selected": " " },
  { "week": "三", "date": "11", "selected": " " },
  { "week": "四", "date": "12", "selected": " " },
  { "week": "五", "date": "13", "selected": " " },
  { "week": "六", "date": "14", "selected": " " },
 ]
},
select: function (e) {
 var oIndex = e.currentTarget.dataset.index;
 var array = this.data.sDate;
 array.forEach( (item,index,arr) => {
  var sItem = "sDate["+ index + "].selected";
  this.setData({
   [sItem]: " "
  })
  console.log([sItem]);
  if(index == oIndex) {
   var oSelected = "sDate[" + index + "].selected"//这里需要将设置的属性用字符串进行拼接
   this.setData({
   [oSelected]: "focus"
   })
  }
 })
},
})