vuecli3-cesium-config (webpack.base.config.js是cli2.x配置)
npm install cesium --save-dev
npm install strip-pragma-loader --save-dev
var Cesium = require('cesium/Cesium');
var Color = require('cesium/Core/Color');
//OR
import Cesium from 'cesium/Cesium';
import Color from 'cesium/core/Color';
jsconfig.json