如何通过Spec的方式声明多个View？ about g2 HOT 2 CLOSED

chart.options({
        type: 'view',
        data:data,
        encode: {
          x: 'month',
          y: 'temperature',
          color: 'city',
         
        },
        children: [
             { type: 'line', encode:{shape: 'smooth'} },
            {
              type: 'point',
               style: {
                fill: 'white'
              }
            },
        ]
      });