如何更换主题

[yanjiasen4]

请问如何选择主题？
我这样写没有效果

import Vue from 'vue'
import VueHighcharts from 'vue-highcharts'
import 'highcharts/themes/dark-unica'

Vue.use(VueHighcharts)

[weizhenye]

import Vue from 'vue';
import VueHighcharts from 'vue-highcharts';
import Highcharts from 'highcharts';

import loadDarkUnica from 'highcharts/themes/dark-unica';

loadDarkUnica(Highcharts);

Vue.use(VueHighcharts, { Highcharts });

[yanjiasen4]

解决了！谢谢