var authority = 'buttonGroup.authority'
that.setData({
[authority]: parseInt(level)
})

var printPrice = "item["+i+"].print_price";
this.setData({
[printPrice]: e.detail.value 
});

onLoad: function () {
      var that=this;
      var up = "info[" + 0 + "].gMoney";//先用一个变量，把(info[0].gMoney)用字符串拼接起来
      that.setData({
        [up]:1
      })
  }