https://vega.github.io/vega/usage/#node 有使用前端 JavaScript 渲染绘图的示例。是否可以在后端生成绘图并将绘图发送到前端？我想我想要实现这样的目标：
const vega = require('vega')
const lite = require('vega-lite')
const embed = require('vega-embed')
var yourVlSpec = {
$schema: 'https://vega.github.io/schema/vega-lite/v2.0.json',
description: 'A simple bar chart with embedded data.',
data: {
values: [
{a: 'A', b: 28},
{a: 'B', b: 55},
{a: 'C', b: 43},
{a: 'D', b: 91},
{a: 'E', b: 81},
{a: 'F', b: 53},
{a: 'G', b: 19},
{a: 'H', b: 87},
{a: 'I', b: 52}
]
},
mark: 'bar',
encoding: {
x: {field: 'a', type: …