使用V-chart时踩过的一些坑

https://www.jianshu.com/p/46d844355f50

<template>
  <ve-histogram :data="chartData" :extend="chartExtend"></ve-histogram>
</template>

<script>
  export default {
    data () {
      this.chartExtend = {
          series: {
            barWidth: 10
          },
          tooltip: {
            trigger: 'none'
          }
        }
      /* 等同于
        this.chartExtend = {
          series (v) {
            v.forEach(i => {
              i.barWidth = 10
            })
            return v
          },
          tooltip (v) {
            v.trigger = 'none'
            return v
          }
        }
        等同于
        this.chartExtend = {
          'series.0.barWidth': 10,
          'series.1.barWidth': 10,
          'tooltip.trigger': 'none'
        }
      */
      return {
        chartData: { ... }
      }
    }
  }
</script>