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//package.json
"scripts": {
"serve": "vue-cli-service serve",
"build": "vue-cli-service build",
"lint": "vue-cli-service lint",
"app": "./server/app.js"
},
直接这样是不行的，因为没有yarn app.js这种执行语句，需要改为：
"scripts": {
"serve": "vue-cli-service serve",
"build": "vue-cli-service build",
"lint": "vue-cli-service lint",
"app": "node ./server/app.js"
},
在执行的语句面前加上node即可正常执行
相当于
node app.js