json数组怎么局部更新？

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json数组怎么局部更新？How to update the json array locally?

 let sdata={      'a':{        'has':true,        'content':[]      },      'b':{         'has':true,        'content':[]      },let chang=sdata['a'].contentchang.push(1)index是个变量，要添加的key是不确定a还是blet schang='sdata['+index+'].content'        that.setData({          schang:chang,        })            that.setData({          'schang':chang,        })都不起作用，谢谢

 let sdata={      'a':{        'has':true,        'content':[]      },      'b':{         'has':true,        'content':[]      },let chang=sdata['a'].contentchang.push(1)index是个变量，要添加的key是不确定a还是blet schang='sdata['+index+'].content'        that.setData({          schang:chang,        }) that.setData({          'schang':chang,        })都不起作用，谢谢

回答：

let content=that.data.sdata.a.contentcontent.push(1)that.setData({  "sdata['a'].content": content})

this.setData({ sdata: JSON.parse(JSON.stringify(this.sdata)),})