解决列表渲染时，动态修改某一条数据的问题

<view bindtap="aa" wx:for="{{array}}"  data-id='{{item.id}}'>
   {{item.zan}}

</view>

Page({
  data:{

     array: [

      {

        id:"a1",

        zan: '赞'

      }, 

      {

        id:"a2",

        zan: '赞'

      }

    ]

  },

aa:function(e){
    var currId = e.currentTarget.dataset.id;

    var array = this.data.array;

    for(var i = 0;i<array.length;i++){

      if(array['id']==currId){

        array['zan'] = "已赞";

        this.setData({

          array:array

        });

      }

    }

  }