uniapp 获取多个元素后执行所有请求之 selectorQuery.exec(callback)

...
	async mounted() {
	    this.$nextTick(() => {
     	  // 自定義組件模式下要使用in(this)
	      const query = uni.createSelectorQuery().in(this); 
	      query.select('.xx1').fields({ size: true})
	      query.select('.xx2').fields({ size: true})
	      query.select('.xx3').fields({ size: true})
	      query.exec((data) => {
	        console.log(data)
	      });
	    })
  },
...