data:{
    list:{
        data1:{},
        passengers:[
            name:''
        ]
    }
}

设置某一项的值

var that=this,
num="list.data1";
that.setData({
    [num]:that.data.list.data1.push(XXX)
})

动态设置

inputVal: function (e) {
    var name = e.currentTarget.dataset.name;
    var index = e.currentTarget.dataset.index;
    var value = 'passengers['+index+'].'+name+'';
    this.setData({
      [value]: e.detail.value
    })
  }