小编jok*_*ade的帖子

有没有办法限制特征,使其只能混合到对象中？例如

trait OnlyForObjects {
  this: ... =>
}

object Foo extends OnlyForObjects  // --> OK

class Bar extends OnlyForObjects   // --> compile error

如何apply()从Scala.js代码调用Javascript对象上定义的函数？

显而易见的解决方案不起作用,因为applyScala.JS(？)总是将其编译到其父对象的函数调用中:

var test = {
  apply: function(idx) {...},
  apple: function(idx) {...}
}

trait Test extends js.Object {
  def apple(idx: Int) : Int = ???
  def apply(idx: Int) : Int = ???
}

val test = js.Dynamic.global.test.asInstanceOf[Test]

test.apple(1) // works, of course

test.apply(1) // does not work (seems to be compiled into the call test(1) ?)

js.Dynamic.global.test.apply(1) // does not work either