javascript alert（）函数在UWP应用程序中不起作用(javascript alert() function not working in UWP app)

 那些是不同的Ts。 
 
scala> type T[T] = { def f: T  } 
defined type alias T

scala> var x: T[Int] = null
x: T[Int] = null

scala> x = new AnyRef { def f = 5 }
x: T[Int] = $anon$1@44daa9f1
 
 当你写： 
 
type Addable[Addable] = { def +(a : Addable) : Addable }
 
 你有一个Addable类型的参数，也叫做Addable。 这是人们经常混淆的类似变化。 
 
scala> def f[Int](x: Int) = x * x
<console>:7: error: value * is not a member of type parameter Int
       def f[Int](x: Int) = x * x
                              ^
 
 你的问题的实际答案是“你不能”，但我不愿意粉碎你的宗教信仰，所以我会说“结构类型以神秘的方式工作”。 如果你想参加一个宗教使命，你可能会在这里访问，这就解释了为什么你不能。 
 
 http://article.gmane.org/gmane.comp.lang.scala/7013 

Those are different Ts.
 
scala> type T[T] = { def f: T  } 
defined type alias T

scala> var x: T[Int] = null
x: T[Int] = null

scala> x = new AnyRef { def f = 5 }
x: T[Int] = $anon$1@44daa9f1
 
When you write:
 
type Addable[Addable] = { def +(a : Addable) : Addable }
 
You have a type Addable which takes a single type parameter, also called Addable. Here's a similar variation people often confuse themselves with.
 
scala> def f[Int](x: Int) = x * x
<console>:7: error: value * is not a member of type parameter Int
       def f[Int](x: Int) = x * x
                              ^
 
The actual answer to your question is "you can't" but I would hate to shatter your religious-like faith so instead I'll say "structural types work in mysterious ways." If you want to go on a religious mission you might visit here, which explains why you can't.
 
http://article.gmane.org/gmane.comp.lang.scala/7013