如何将scala.sys.process与scala.js结合使用
如何将scala.sys.process与scala.js结合使用
提问于 2017-03-12 17:21:44
我已经将scala.sys.process._导入到我的scala.js项目中。这本身并不会造成任何问题，但是如果我添加了一个简单的命令，比如println("ls".!!)，我会得到一个非常多的错误，例如
[error] Referring to non-existent class java.lang.ProcessBuilder
[error] called from scala.sys.process.ProcessCreation.apply(scala.collection.Seq,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.Process$.apply(scala.collection.Seq,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.ProcessCreation.apply(java.lang.String,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.Process$.apply(java.lang.String,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.ProcessCreation.apply(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.Process$.apply(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.ProcessImplicits.stringToProcess(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.package$.stringToProcess(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from draw.Main$.main(org.scalajs.dom.raw.HTMLCanvasElement)scala.Unit
[error] called from draw.Main$.$$js$exported$meth$main(org.scalajs.dom.raw.HTMLCanvasElement)java.lang.Object
[error] called from draw.Main$.main
[error] exported to JavaScript with @JSExport
[error] involving instantiated classes:
[error] scala.sys.process.Process$
[error] scala.sys.process.package$
[error] draw.Main$
[error] Referring to non-existent class java.io.File
[error] called from scala.sys.process.ProcessCreation.apply(scala.collection.Seq,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.Process$.apply(scala.collection.Seq,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.ProcessCreation.apply(java.lang.String,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.Process$.apply(java.lang.String,scala.Option,scala.collection.Seq)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.ProcessCreation.apply(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.Process$.apply(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.ProcessImplicits.stringToProcess(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from scala.sys.process.package$.stringToProcess(java.lang.String)scala.sys.process.ProcessBuilder
[error] called from draw.Main$.main(org.scalajs.dom.raw.HTMLCanvasElement)scala.Unit
[error] called from draw.Main$.$$js$exported$meth$main(org.scalajs.dom.raw.HTMLCanvasElement)java.lang.Object
[error] called from draw.Main$.main
[error] exported to JavaScript with @JSExport
[error] involving instantiated classes:
[error] scala.sys.process.Process$
[error] scala.sys.process.package$
[error] draw.Main$
[error] Referring to non-existent method java.lang.ProcessBuilder.environment()java.util.Map导入额外的类(如java.lang.ProcessBuilder和java.io.File )对这些错误的内容没有影响。这里有什么很简单的东西吗？
谢谢!
回答 1
Stack Overflow用户
回答已采纳
发布于 2017-03-12 17:44:20
您不能简单地将任意Scala库导入Scala.js --尽管语言是相同的，但是环境非常不同。许多标准Scala库在SJS世界中根本不存在，而且由于它运行的JavaScript环境的限制，其中许多库不能存在。它在语法上是合法的，所以它将编译，但它不能在没有库的Scala.js版本之前运行。
总的来说，您应该假设这样的库在SJS世界中并不存在，除非您发现有人专门移植了它。(老实说，我不知道是否有人为Node.js移植了Node.js；这在浏览器环境中没有多大意义.)
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原文链接：
https://stackoverflow.com/questions/42750637
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