引入vux，v-chart 报错
引入vux，v-chart 报错，错误信息如下：
```
ERROR Failed to compile with 1 errors 18:17:42

error in ./node_modules/_vux@2.9.1@vux/src/components/v-chart/mixin.js

Module parse failed: Unexpected token (18:6)
You may need an appropriate loader to handle this file type.
| this.$parent.set(this.chartName, {
| shape: defaultShapeMap[this.chartName] || '',
| ...this.$props,
| ...camelAttrs(this.$attrs)
| })
```
vux2必须配合vux-loader使用, 请在build/webpack.base.conf.js里参照如下代码进行配置：
```
const vuxLoader = require('vux-loader')
const webpackConfig = originalConfig // 原来的 module.exports 代码赋值给变量 webpackConfig

module.exports = vuxLoader.merge(webpackConfig, {
  plugins: ['vux-ui']
})
```