打包一个刚创建好的vue项目的npm打包与yarn打包时间对比由于一开始yarn的命令打错了，所以先用的npm打包npm打包花了将近一分钟时间yarn只用了18秒

vue.runtime.esm.js?0261:619 [Vue warn]: Property or method “active” is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or