我正在嘗試將 JavaScript 類模塊script.js匯入 Scala 程式main.scala并使用它的方法add和divide.
我使用 scala.js 匯入 JS 腳本和 SBT 進行構建。
但是，當我嘗試運行該程式時，出現以下錯誤：
value add is not a member of example.MyType
value divide is not a member of example.MyType
你能幫我找出問題所在嗎？
提前致謝！
代碼看起來像這樣！
main.scala
package example
import scala.scalajs.js
import scala.scalajs.js.annotation._
@js.native
@JSImport("script.js","MyType")
class MyType(var x:Double, var y:Double) extends js.Object {
add(z: Int)
divide(z: Int)
}
object Hello extends App {
work() // Sum: 1, Divide: 6
@JSExport
def work(): Unit = {
val added = new MyType(1,2).add(3)
println(s"Sum: $added,") // 1
val divided = new MyType(4,3).divide(2)
println(s"Divide: $divided") // 6
}
}
腳本.js：
class MyType {
constructor(x, y) {
this.x = x;
this.y = y;
}
add(z){
let {x,y} = this;
return x y z;
}
divide(z){
let {x,y} = this;
return (x y)/z;
}
};
module.exports = {MyType};
插件.sbt:
addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.10.0")
addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")
構建.sbt：
import Dependencies._
ThisBuild / scalaVersion := "2.13.8"
ThisBuild / version := "0.1.0-SNAPSHOT"
ThisBuild / organization := "com.example"
ThisBuild / organizationName := "example"
lazy val root = (project in file("."))
.settings(
name := "add",
libraryDependencies = scalaTest % Test
)
enablePlugins(ScalaJSPlugin)
scalaJSUseMainModuleInitializer := true
// See https://www.scala-sbt.org/1.x/docs/Using-Sonatype.html for instructions on how to publish to Sonatype.
uj5u.com熱心網友回復：
看起來您對定義方法的 Scala 語法有點困惑。add并divide應宣告為
@js.native
@JSImport("script.js","MyType")
class MyType(var x:Double, var y:Double) extends js.Object {
def add(z: Int): Double = js.native
def divide(z: Int): Double = js.native
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/463744.html
標籤：javascript 斯卡拉 sbt scala.js