我在推送到heroku时收到以下错误消息:Delta compression using up to 4 threads.Total 21 (delta 5), reused 0 (delta 0)
-----> Resolving engine versionsWARNING: No version of Node.js specified in package.json, see:
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发生了一个未处理的异常:无法读取未定义的属性‘减号’参见“/tmp/ng-9JMDN 2/ang-errors.log”以获取更多详细信息。npm错误!代码ELIFECYCLE npm错误!qna@0.0.0 heroku-postbuild:ng build --prod npm ERR!孕育ENOENT错误!npm错误!qna@0.0.0 heroku-postbuild脚本失败。If you're stuck, please submit a ticket so we can help: